Geyer, Prof. Dr. Gerd

on appointment

• Palaeontology
• Biostratigraphy

2024

Landing, E., Geyer, G. (2024). Discussion: The Terreneuvian MacCodrum Brook section, Mira terrane, Cape Breton Island, Nova Scotia, Canada: age constraints from ash layers, organic-walled microfossils, and trace fossils. Canadian Journal of Earth Sciences, 61, 1-7, https://doi.org/10.1139/cjes-2023-0031 

Landing, E., Geyer, G., Westrop, S.R., Wotte, T. (2024). Unconformity-bounded rift sequences in Terreneuvian-Miaolingian strata of the Caledonian Highlands, Atlantic Canada: Comment. Geological Society of America, Bulletin, 136 (7/8): 3472-3478

Malinky, J.M., Geyer, G. (2024). Early Cambrian hyoliths from the Brigus Formation of Avalonian Newfoundland, Alcheringa: An Australasian Journal of Palaeontology, 48 (1) : 1-41, https://doi.org/10.1080/03115518.2023.2293724 

Mghazli, K., Lazreq, N., Geyer, G.,  Landing, E., Boumehdi, M.A., Youbi, N. (2024). Paleobiogeographic aspets thought Moroccan Lower-Middle Cambrian schmall shelly fossils from the High Atlas, Morocco. In:  Ibouh, H.; Youbi, N. (Eds.): International Joint Conference: IDV 8 - LIPs8 - Rodinia 2023.

Landing, E., Geyer G. (2024). Comment on 'new evidence  for the Baltican cratonic affinity and Tonian to Ediacaran tectonic evolution of West Avalonia in the Avalon Peninsula, Newfoundland, Canada', Precambrian Research, 410: 107489, 4 S.

Geyer, G., Hegna, T.A., Kelber, K.P. (2024). The end of the 'living fossil' Tale? A new look at Triassic specimens assigned to the tadpole shrimps Triops cancriformis (Notostraca) and associated phyllopods from the Vosges region (eastern France). Papers in Palaeontology, 10 (5): e1589, 31 S.; https://doi.org/10.1002/spp2.1589 

Landing, E., Geyer, G., Westrop, S.R., Schmitz, M.D. (2024). Frilobite mineralization, diachronous lowest occurence of trilobites, and a global Lower Cambrian subdivision. The Geological Society of America, Connects 2024, 22-25 September, Anaheim, California. Geological Society of America, Abstracts with Programs, 56 (5); 1 S. https://doi.org/10.1130/abs/2024AM-402484 

Geyer, G. (2024). The Wildenstein Member (Tannenknock Formation), Wuliuan Satage (mid-Cambrian), Franconian Forest, Germany: Agnostid and trilobite systematics, morpholgy, ecology, taphonomy. With a review of ellipsocephalid, solenopleurid and conocoryphid trilobites. Geologica Bavarica, 129: 418 S., Augsburg.

2023

Landing, E., & Geyer, G. (2023). Discussion: The Terreneuvian MacCodrum Brook section, Mira terrane, Cape Breton Island, Nova Scotia, Canada: age constraints from ash layers, organic-walled microfossils, and trace fossils. Canadian Journal of Earth Sciences, 60(9), 1349-1355. https://doi.org/10.1139/cjes-2023-0031

Landing, E., Kröger, B., Westrop, S.R., & Geyer, G. (2023). Proposed Early Cambrian cephalopods are chimaeras, the oldest known cephalopods are 30 my younger. Communications Biology, 6(1), 32. https://doi.org/10.1038/s42003-021-01885-w

Kraft, P., Linnemann, U., Mergl, M., Bruthansova, J., Laibl, L., Geyer, G. (2023). Ordovician of the Bohemian Massif. In: Harper, D.A.T., Lefebvre, B.; Percival, I.G.; & Servais. T. (Hrsg.): A Global Sythesis of the Ordovician System: Part 1. Geological Society, London, Vol. 532. 433 - 464. https://doi.org/10.1144/SP532-2022-191

Daraei, M., Bayet‐Goll, A., Geyer, G., & Bahrami, N. (2023). Late Cambrian climate change recorded by a shift from an arid carbonate platform to a storm‐dominated cool‐water platform at the Gondwana margin (Alborz Zone, Iran). Geological Journal, 58(2), 795-824.  https://doi.org/10.1002/gj.4624

Geyer, G., Landing, E., Meier, S., & Höhn, S. (2023). Oldest known West Gondwanan graptolite: Ovetograptus? sp.(lower Agdzian/lowest Wuliuan; basal Middle Cambrian) of the Franconian Forest, Germany, and review of pre-Furongian graptolithoids. PalZ, 97(4), 677-686.

2022

Mghazli, K., Lazreq, N., Geyer, G., Landing, E., Boumehdi, M.A., & Youbi, N. (2023). Cambrian microfossils from the High Atlas, Morocco: Taxonomic, biostratigraphic, palaeobiogeographic, and depositional significance of the Brèche à Micmacca limestone beds. Journal of African Earth Sciences, 197, 104751. https://doi.org/10.1016/j.jafrearsci.2022.104751 

Sundberg, F.A., Webster, M., & Geyer, G. (2022). Biostratigraphical significance of a new trilobite fauna from the Harkless Formation (upper Stage 4, Series 2, Cambrian), Nevada, USA. Lethaia, 55(3), 1-12. https://doi.org/10.18261/let.55.3.8 

Cederstrom, P., Geyer, G., Ahlberg, P., Nilsson, C.H., & Ahlgren, J. (2022). Ellipsocephalid trilobites from Cambrian Series 2 and Stage 4. Scandinavian University Press. 131 p.

Landing, E., Keppie, J.D., Keppie, D.F., Geyer, G., & Westrop, S. R. (2022). Greater Avalonia—latest Ediacaran–Ordovician “peribaltic” terrane bounded by continental margin prisms (“Ganderia,” Harlech Dome, Meguma): review, tectonic implications, and paleogeography. Earth-Science Reviews, 224, 103863. https://doi.org/10.1016/j.earscirev.2021.103863

Landing, E., Westrop, S.R., & Geyer, G. (2022). Trans-Avalonian green–black boundary (early Middle Cambrian): transform fault-driven epeirogeny and onset of 26 my of shallow-marine, black mudstone in Avalonia (Rhode Island–Belgium) and Baltica. Canadian Journal of Earth Sciences, 60(2), 133-171. https://doi.org/10.1139/cjes-2022-0065

Landing, E., Ripperdan, R. & Geyer, G. (2022): Discussion of ‘Reply to “Uppermost Cambrian carbon chemostratigraphy: the HERB and undocumented TOCE events are not synonymous”’. Geological Magazine, 159 (1): 173–176, https://doi.org/10.1017/ S001675682100090X.

2021

Landing, E. & Geyer, G. (2021): Trace fossils, depositional context, and paleogeography of the upper Tal Group (upper lower Cambrian), Lesser Himalaya, India: a Gondwanan succession with no affinities to the Avalonia microcontinent – discussion of paper by Singh et al. (2019). Ichnos, 28 (2): 14 S., doi:10.1080/10420940.2020.1843457.

Landing, E., Schmitz, M. D., Geyer, G., Trayler R.B. & Bowring, S.A. (2021): Precise early Cambrian U–Pb zircon dates bracket the oldest trilobites and archaeocyaths in Moroccan West Gondwana. Geological Magazine, 158 (2): 219–238, https://doi.org/10.1017/S0016756820000369.

Geyer, G. & Landing, E. (2021): The Souss lagerstätte of the Anti-Atlas, Morocco: discovery of the first Cambrian fossil lagerstätte from Africa. Scientific Reports, 11, no. 3107, https://doi.org/10.1038/s41598-021-82546-0.

Messori, F., Linnemann, U., Hofmann, M., Zieger, J., Geyer, G., Vickers-Rich, P., and Ovtcharova, M. (2021): New high precision U-Pb CA-ID-TIMS zircon ages from the Ediacaran in Namibia. EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-15112, https://doi.org/10.5194/egusphere-egu21-15112.

Hagdorn, H., Simon, T., Dittrich, D., Geyer, G., Kramm, E. & Voigt, T. (2021): 8.2. Lithostratigraphie der Unterer-Muschelkalk-Subgruppe. In: Deutsche Stratigraphische Kommission (Hrsg.; Koordination und Redaktion: Hagdorn, H. für die Subkommission Perm-Trias): Stratigraphie von Deutschland XIII. Muschelkalk. Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften, 91: 451–494; Hannover.

Hagdorn, H., Simon, T., Dittrich, D., Ernst, R., Farrenschon, J., Freudenberger, W., Geyer, G., Kramm, E. & Vath, U. (2021): 8.4. Lithostratigraphie der Oberer-Muschelkalk-Subgruppe. In: Deutsche Stratigraphische Kommission (Hrsg.; Koordination und Redaktion: Hagdorn, H. für die Subkommission Perm-Trias): Stratigraphie von Deutschland XIII. Muschelkalk. Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften, 91: 521–592; Hannover.

Friedlein, V. & Geyer, G. (2021): 8.5. Lithostratigraphie der Eschenbach-Formation. In: Deutsche Stratigraphische Kommission (Hrsg.; Koordination und Redaktion: Hagdorn, H. für die Subkommission Perm-Trias): Stratigraphie von Deutschland XIII. Muschelkalk. Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften, 91: 593–605; Hannover.

Friedlein, V. & Geyer, G. (2021): 8.6. Lithostratigraphie der Grafenwöhr-Formation. In: Deutsche Stratigraphische Kommission (Hrsg.; Koordination und Redaktion: Hagdorn, H. für die Subkommission Perm-Trias): Stratigraphie von Deutschland XIII. Muschelkalk. Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften, 91: 606–620; Hannover.

Geyer, G., Ernst, R., Freudenberger, W., Hagdorn, H., Kramm, E., Ockert, W., Schmitt, O. & Wilmsen, M. (2021): 9.9. Der Muschelkalk im westlichen Franken (Bayern) und Südthüringen. In: Deutsche Stratigraphische Kommission (Hrsg.; Koordination und Redaktion: Hagdorn, H. für die Subkommission Perm-Trias): Stratigraphie von Deutschland XIII. Muschelkalk. Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften, 91: 800–853, Hannover.

Geyer, G. & Friedlein, V. (2021): 9.10. Die Randfazies des Muschelkalks in Nord-Bayern. In: Deutsche Stratigraphische Kommission (Hrsg.; Koordination und Redaktion: Hagdorn, H. für die Subkommission Perm-Trias): Stratigraphie von Deutschland XIII. Muschelkalk. Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften, 91: 854–894; Hannover.

Bayet-Goll., A., Daraei. M., Geyer, G., Bahrami, N. & Bagheri, F. (2021): Environmental constraints on the distribution of matground and mixground ecosystems across the Cambrian Series 2–Miaolingian boundary interval in Iran: A case study for the central sector of northern Gondwana. Journal of African Earth Sciences, 176: 22 pp., https://doi.org/10.1016/j.jafrearsci.2021.104120.

Messori, F., Linnemann, U., Hofmann, M., Zieger, J., Geyer, G., Vickers-Rich, P., & Ovtcharova, M. (2021): New high precision U-Pb CA-ID-TIMS zircon ages from the Ediacaran in Namibia. Goldschmidt virtual 2021, Abstracts, online.

Mghazli, K., Geyer, G., Youbi, N. & Lazreq, N. (2021): The Bréche à Micmacca limestones: A unique window to biota of the lower–middle Cambrian boundary interval. In: Bábek, O, & Vodrážková, S. (Hrsg.): 35^th Meeting of Sedimentology, Virtual Meeting, Prague 01, Book of Abstracts, Contribution 607: 1 S.; Olomouc (Palacký University of Olomouc).

Landing, E., Geyer, G., Jirkov, I.A. & Schiaparelli, S. (2021): Lophotrochozoa in the Cambrian evolutionary radiation and the Pelagiella problem. Papers in Palaeontology, 7 (4): 2227–2244, https://doi.org/10.1002/spp2.1396.

De Baets, K., Budil, P., Fatka, O. & Geyer, G. (2021): Trilobites as Hosts for Parasites: From Paleopathologies to Etiologies. In: K. De Baets & J. W. Huntley (Hrsg.): The Evolution and Fossil Record of Parasitism, Topics in Geobiology, 50: 173–201. https://doi.org/10.1007/978-3-030-52233-9_6.

Eichhorn, R. & Geyer, G. (2021): Zu Stein geworden. 50 Fossilien und ihre Geschichten. 296 S., München (Bayerisches Landesamt für Umwelt).

Bayet-Goll., A., Daraei. M., Geyer, G., Neto de Carvalho, C. & Bahrami, N. (2021): Exotic facies episodes of a carbonate platform: implications for middle and late Cambrian ecosystems and impact of bioturbation in the Alborz Basin, Iran. Geological Society, London, Special Publications, 522; XX S., https://doi.org/10.1144/SP522-2020-269.

Landing, E., KEPPIE, J.D., Keppie, D.F., Geyer, G. & Westrop, S.D. (2021): Greater Avalonia—latest Ediacaran–Ordovician “peribaltic” terrane bounded by continental margin prisms (“Ganderia,” Harlech Dome, Meguma): Review, tectonic implications, and paleogeography. Earth-Science Reviews, 224, 103863, 49 S.

2015–2019

Geyer, G. 2019. A comprehensive Cambrian correlation chart. Episodes, 42 (4): 12 S., doi:10.18814/epiiugs/2019/019026.

Geyer, G. & Malinky, J.M. 2019. Helcionelloid molluscs and hyoliths from the Miaolingian (middle Cambrian) of the subsurface of the Delitzsch–Torgau–Doberlug Syncline, northern Saxony, Germany. PalZ, 93: 23 S., doi:10.1007/s12542-019-00472-z.

Streng, M. & Geyer, G. 2019. Middle Cambrian Bradoriida (Arthropoda) from the Franconian Forest, Germany, with a review of the bradoriids described from West Gondwana and a revision of material from Baltica. PalZ, 93: 567–591, doi:10.1007/s12542-019-00448-z.

Geyer, G., Landing, E., Höhn, S., Linnemann, U., Meier, S., Servais, T., Wotte, T. & Herbig, H.-G. 2019. Revised Cambrian stratigraphy in the Franconian Forest (Frankenwald), Germany, reveals typical West Gondwana succession in the Saxothuringian Belt. Newsletters on Stratigraphy, 54 (2): 377–433, doi:10.1127/nos/2019/0495.

Malinky, J.M. & Geyer, G. 2019. Cambrian Hyolitha of Siberian, Baltican and Avalonian aspect in east Laurentian North America: taxonomy and palaeobiogeography. Alcheringa, 43 (2): 171–203, doi:10.1080/03115518.2019.1567813.

Geyer, G. 2019. The earliest known West Gondwanan trilobites from the Anti-Atlas of Morocco, with a revision of the Family Bigotinidae Hupé, 1953. Fossils and Strata, 64: 55–153.

Geyer, G., Nowicki, J., Żylińska, A. & Landing, E. 2019. Comment on: Álvaro, J. J., Esteve, J. & Zamora, S. 2019. Morphological assessment of the earliest paradoxidid trilobites (Cambrian Series 3) from Morocco and Spain [Geological Magazine]. Geological Magazine, 156: 1691–1707, doi:10.1017/S0016756818000961.

Linnemann, U., Ovtcharova, M., Schaltegger, U., Gärtner, A., Hautmann, M., Geyer, G., Vickers-Rich, P., Rich, T., Plessen, B., Hofmann, M., Zieger, J., Krause, R., Kriesfeld, L., & Smith, J. 2019. New high-resolution age data from the Ediacaran–Cambrian boundary indicate rapid, ecologically driven onset of the Cambrian explosion. Terra Nova, 31: 49–58, doi: 10.1111/ter.12368.

Geyer, G., Valent, M. & Meier, S. 2019. Helcionelloids, stenothecoids and hyoliths from the Tannenknock Formation (traditional lower middle Stage 4/Wuliuan boundary interval) of the Franconian Forest, Germany. PalZ, 93: 207–253, doi:10.1007/s12542-018-0433-5.

Lorenz, J.A., Geyer, G., Okrusch, M. & Schmitt, R.T. 2018. Die Geologie des Baufelds. Kristallingesteine, Zechstein-Sedimente, Bröckelschiefer, Buntsandstein, hydrothermale Gangmineralisationen und quartäre Sedimente. Eine Dokumentation. In: Lorenz, J.A. (Hrsg.). Die Tunnel zwischen Laufach und Heigenbrücken. Die Jahrhundertbaustelle der Umfahrung des Schwarzkopftunnels: Geologie, Mineralogie, Geschichte, Bau und Technik der neuen Eisenbahntunnel durch den Spessart. Mitteilungen des Naturwissenschaftlichen Museums Aschaffenburg, Band 29: 34–167, Karlstein am Main (Helga Lorenz Verlag).

Geyer, G., Amler, M.R.W., Friedel, J, Grein, B., & Lorenz, J.A. 2018. Die fossilführenden Schichten des Zechsteinkalks. In: Lorenz, J.A. (Hrsg.). Die Tunnel zwischen Laufach und Heigenbrücken. Die Jahrhundertbaustelle der Umfahrung des Schwarzkopftunnels: Geologie, Mineralogie, Geschichte, Bau und Technik der neuen Eisenbahntunnel durch den Spessart. Mitteilungen des Naturwissenschaftlichen Museums Aschaffenburg, Band 29: 272–282, Karlstein am Main (Helga Lorenz Verlag).

Bayet-Goll, A., Geyer, G. & Daraei, M. 2018. Tectonic and eustatic controls on the spatial distribution and stratigraphic architecture of late early Cambrian successions at the northern Gondwana margin: The siliciclastic-carbonate successions of the Lalun Formation in central Iran. Marine and Petroleum Geology, 98: 199–228, doi:10.1016/j.marpetgeo.2018.08.002.

Geyer, G. & Kelber, K.-P. 2018. Spinicaudata (“Conchostraca”, Crustacea) from the Middle Keuper (Upper Triassic) of the southern Germanic Basin, with a review of Carnian–Norian taxa and suggested biozones. PalZ, 92 (1): 1–34, doi:10.1007/s12542-017-0363-7.

Geyer, G. 2018. A new enigmatic hyolith from the Cambrian of West Gondwana and its bearing on the systematics of hyoliths. Papers in Palaeontology, 4 (1): 85–100.

Landing, E., Antcliffe, J.B., Geyer, G., Kouchinsky, A., Bowser, S.S. & Andreas, A. 2018. Early evolution of colonial animals (Ediacaran Evolutionary Radiation–Cambrian Evolutionary Radiation–Great Ordovician Biodiversification Interval). Earth-Science Reviews 178: 105–135, doi: 10.1016/j.earscirev.2018.01.013.

Kemnitz, H., Ehling, B.-C., Elicki, O., Franzke, H.-J., Geyer, G., Linnemann, U., Leonhardt, D., Plessen, B., Rötzler, J., Rohrmüller, J., Romer, R. L., Tichomirowa, M. & Zedler, H. 2017. Proterozoikum–Silur in der Stratigraphischen Tabelle von Deutschland 2016 [Stratigraphic Table of Germany 2016: Proterozoic to Silurian.]. Zeitschrift der Deitschen Gesellschaft für Geowissenschaften, 168: 423–446, doi:10.1127/zdgg/2017/0134.

Zhang, X.L., Ahlberg, P., Babcock, L.E., Choi, D.K., Geyer, G., Gozalo, R., Hollingsworth, J.S., Li, G.X., Naimark, E.B., Pegel, T., Steiner, M., Wotte, T., Zhang, Zh.F. 2017. Challenges in defining the base of Cambrian Series 2 and Stage 3. Earth-Science Reviews, 172: 124–139.

Geyer, G. 2017. Trilobites of the Galgenberg Member (Tannenknock Formation), middle Cambrian Stage 5, Franconian Forest, Germany: a paradigmatic lowermost middle Cambrian West Gondwanan fauna. PalZ, 91: 5–70, doi: 10.1007/s12542-017-0339-7.

Geyer, G. & Peel, J. S. 2017. Middle Cambrian trilobites from the Ekspedition Bræ Formation of North Greenland, with a reappraisal of the genus Elrathina. Journal of Paleontology, 91 (2): 265–293.

Landing, E. & Geyer, G. 2016. Comment on “Terreneuvian small shelly faunas of east Yunnan (South China) and their biostratigraphic implications” by B. Yang et al. [Palaeogeography, Palaeoclimatology, Palaeoecology 398 (2014) 28–58]. Palaeogeography, Palaeoclimatology, Palaeoecology, 2016, doi:10.1016/j.palaeo.2016.04.016.

Nitsch, E., Friedlein, V. & Geyer, G. 2016. Keuper A – Diskontinuität. In: Deutsche Stratigraphische Kommission (ed.; Koordination und Gestaltung: Menning, M. & Hendrich, A.): Stratigraphische Tabelle von Deutschland 2016, Potsdam (GeoForschungsZentrum).

Sundberg, F. A., Fletcher, T. P., Geyer, G., Kruse, P. D., McCollum, L. B., Pegel, T. V., Żylińska, A. & Zhuravlev, A. Yu. 2016. International correlation of the lower-middle Cambrian (Series 2-3, Stage 4-5). Memoirs of the Association of Australasian Palaeontologists, 49: 83–124.

Peel, J.S., Streng, M., Geyer, G., Kouchinsky, A. & Skovsted, C. B. 2016. Ovatoryctocara granulata assemblage (Cambrian Series 2–Series 3 boundary) of Løndal, North Greenland. Memoirs of the Association of Australasian Palaeontologists, 49: 241–282.

Geyer, G. 2016. Taxonomy of the ‘Micmacca’ group, new Cambrian Chengkouiidae (Trilobita) from Morocco, and their bearing on intercontinental correlation. Australasian Palaeontological Memoirs, 49: 329–393.

Geyer, G. & Landing, E. 2016. The Precambrian–Phanerozoic and Ediacaran–Cambrian boundaries: a historical approach to a dilemma. In: Brasier, A. T., McIlroy, D. & McLoughlin, N. (Hrsg.). Earth System Evolution and Early Life: a Celebration of the Work of Martin Brasier. Geological Society, London, Special Publications, 448: 311–349, doi:10.1144/SP448.10.

Geyer, G. 2015. Exotic trilobites from the lower–middle Cambrian boundary interval in Morocco and their bearing on the Cambrian Series 3 lower boundary. Paläontologische Zeitschrift, 89 (4): 749–781, doi:10.1007/s12542-014-0254-0.

Geyer, G. & Corbacho, J. 2015. The Burlingiidae (Trilobita): revised generic composition, stratigraphy, and the first species from the early Middle Cambrian of West Gondwana. GFF, 137 (3): 212–225, doi:10.1080/11035897.2015.1027266.

Weidner, T., Geyer, G., Ebbestad, J. O. R. & von Seckendorff, V. 2015. Erratic boulders from Jutland, Denmark, feature an uppermost lower Cambrian fauna of the Lingulid Sandstone Member of Västergötland, Sweden. Bulletin of the Geological Society of Denmark, 63: 59–86.

2010–2014

Geyer, G., Bayet-Goll, A., Wilmsen, M., Mahboubi, A. & Moussavi-Harami, R. 2014. Lithostratigraphic revision of the Middle Cambrian and Furongian in northern and northeastern Iran. Newsletters on Stratigraphy, 47 (1): 21–59.

Geyer, G., Buschmann, B. & Elicki, O. 2014. A new earliest middle Cambrian (Series 3, Stage 5) faunule from Saxony (Germany) and its bearing on the tectonostratigraphic history of the Saxothuringian domain. Paläontologische Zeitschrift, 88 (3): 239–262, doi:10.1007/s12542-013-0195-z.

Geyer, G. & Vincent, T. 2014. The Paradoxides puzzle resolved– the appearance of the oldest paradoxidines and its bearing on the Cambrian Series 3 lower boundary. Paläontologische Zeitschrift, 89 (3): 335–398, doi:10.1007/s12542-014-0225-5.

Geyer, G. & Busche, D. 2014. Die neogene Dürrnberg-Formation (neu) im nördlichen Franken und ihre Bedeutung für die morphologische Entwicklung und die Klimageschichte an der Haßberge- und Steigerwald-Stufe. Jahresberichte und Mitteilungen der oberrheinischen geologischen Vereinigung, 96: 379–-405.

Geyer, G., Peel, J. S., Streng, M., Voigt, S., Fischer, J. & Preuße, M. 2014. A remarkable Amgan (middle Cambrian, Stage 5) fauna from the Sauk Tanga, Madygen region, Kyrgyzstan. Bulletin of Geosciences, 89 (2): 375–400.

Geyer, G. & Lorenz, J. 2014. Quo vadis Buntsandstein? Ungeahnte Fallstricke der Nomenklatur und Stratigraphie im Spessart. Jahresberichte der Wetterauischen Gesellschaft für die gesamte Naturkunde zu Hanau, Themenband Spessart, 163-164: 33–73.

Bayet-Goll, A., Geyer, G., Wilmsen, M., Mahboubi, A. & Moussavi-Harami, R. 2014. Facies architecture, depositional environments and stratigraphy of the Middle Cambrian Fasham and Deh-Sufiyan formations in the central Alborz, Iran. Facies, 60: 815‒841, doi:10.1007/s10347-014-0401-9

Landing, E., Geyer, G., Buchwaldt, R. & Bowring, S.A. 2014. Geochronology of the Middle Cambrian: a precise U‒Pb zircon date from the German margin of West Gondwana. Geological Magazine, 152: 28–40, doi:10.1017/S0016756814000119.

Freudenberger, W., Geyer, G. & Schröder, B. 2014. Der Buntsandstein im nördlichen Bayern (nordwestliches Franken, Bruchschollenland und Randfazies im Untergrund). In: Deutsche Stratigraphische Kommission (Hrsg.; Koordination und Redaktion: Lepper, J. & Röhling, H.-G. für die Subkommission Perm-Trias): Stratigraphie von Deutschland XI. Buntsandstein. Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften, Heft 69: 547–582 („2013“).

Landing, E., Geyer, G., Brasier, M.D. & Bowring, S.A. 2013. Cambrian Evolutionary Radiation: context, correlation, and chronostratigraphy—overcoming deficiencies of the first appearance datum (FAD) concept. Earth-Science Reviews, 123: 133–172.

Loth, G., Geyer, G., Hoffmann, U., Jobe, E., Lagally, U., Loth, R., Pürner, T., Weinig, H. & Rohrmüller, J. 2013. Geotope in Unterfranken. 197 S., viele Abb.; Augsburg (Bayerisches Landesamt für Umwelt).

Elicki, O. & Geyer, G. 2013. Cambrian trilobites of Jordan: taxonomy, stratigraphic affinity, and functional morphology revised. Acta Geologica Polonica, 63 (1): 1–56.

Okrusch, M., Geyer, G. & Lorenz, J. 2011. Spessart. Sammlung Geologischer Führer, 106: VIII+368 S., Stuttgart (Borntraeger).

Geyer, G. & Peel, J. S. 2011. The Henson Gletscher Formation, North Greenland, and its bearing on the global Cambrian Series 2–Series 3 boundary. Bulletin of Geosciences, 86 (3): 465–534.

Rahman, I. A., Zamora, S. & Geyer, G. 2010. The oldest stylophoran echinoderm: a new Ceratocystis from the Middle Cambrian of Germany. Paläontologische Zeitschrift, 84 (2): 227–237, doi:10.1007/s12542-009-0039-z.

Elicki, O. & Geyer, G. 2010. The faunal province of the southern margin of the Rheic Ocean. Cambrian biostratigraphy. In: Linnemann, U. & Romer, R.L. (Hrsg.). Pre-Mesozoic Geology of Saxo-Thuringia – From the Cadomian Active Margin to the Variscan Orogen: 103-114, Abb. 1-4; Stuttgart (Schweizerbart).

Heuse, T., Geyer, G. & Maletz, J. 2010. The faunal province of the southern margin of the Rheic Ocean. Ordovician biostratigraphy. In: Linnemann, U. & Romer, R.L. (Hrsg.). Pre-Mesozoic Geology of Saxo-Thuringia – From the Cadomian Active Margin to the Variscan Orogen: 114-130, Abb. 5-9; Stuttgart (Schweizerbart).

Geyer, G. 2010. Cambrian and lowermost Ordovician of the Franconian Forest. In: Fatka, O. & Budil, P. (Hrsg.). Prague 2010 – The 15^th Field Conference of the Cambrian Stage subdivision Working Group. International Subcommission on Cambrian Stratigraphy. 4‒11 June 2010. Abstracts and Excursion Guide: 78-92, 6 Abb.; Prag (Czech Geological Survey).

2005–2009

Geyer, G. & Schmidt-Kaler, H. 2009. Den Main entlang durch das Fränkische Schichtstufenland. Wanderungen in die Erdgeschichte, 23: 208 S., München (Pfeil-Verlag).

Landing, E., Johnson, S. C. & Geyer, G. 2008. Faunas and Cambrian volcanism on the Avalonian marginal platform, southern New Brunswick. Journal of Paleontology, 82: 884-905, 9 Abb., 1 Tab.; Tulsa, OK.

Geyer, G., Elicki, O., Fatka, O. & Żylińska, A. 2008. Cambrian. In: McCann, T. (Hrsg.). The Geology of Central Europe. Volume 1: Precambrian and Palaeozoic: 155-202, 30 Abb., 1 Tab.; London (Geological Society of London).

Geyer, G. 2007. The Early Cambrian trilobite Gigantopygus: its morphology, taxonomy, ecology, with remarks on the facial suture of Gigantopygus angustalatus. Beringeria, 37: 41–60.

Landing, E. & Geyer, G. 2007. Reply: “Distinguishing eustatic and epeirogenic controls on Lower–Middle Cambrian boundary successions in West Gondwana (Morocco and Iberia)”. Sedimentology, 53 (4): 525–528.

Landing, E., Peng, Sh.Ch., Babcock, L.E., Geyer, G. & Moczydłowska-Vidal, M. 2007. Global standard names for the lowermost Cambrian series and stage. Episodes, 30, 287–289.

Peng, S., Babcock, L. E., Geyer, G. & Moczydlowska, M. 2006. Nomenclature of Cambrian epochs and serie based on GSSPs -- Comments on an alternative proposal by Rowland and Hicks. Episodes, 29 (2): 130–132.

Landing, E., Geyer, G. & Heldmaier, W. 2006. Distinguishing eustatic and epeirogenic controls on Lower–Middle Cambrian boundary successions in West Gondwana (Morocco and Iberia). Sedimentology, 53 (4): 899–918.

Geyer, G. & Schmidt-Kaler, H. 2006. Haßberge. Wanderungen in die Erdgeschichte, 20: 128 S., München (Pfeil-Verlag).

Geyer, G. & Schmidt-Kaler, H. 2006. Coburger Land und Heldburger Gangschar. Wanderungen in die Erdgeschichte, 21: 144 S., München (Pfeil-Verlag).

Geyer, G., & Landing, E. 2006. Latest Ediacaran and Cambrian of the Moroccan Atlas regions. In: Geyer, G. & Landing, E. (Hrsg.). Ediacaran–Cambrian depositional environments and stratigraphy of the western Atlas regions. UCL Maghreb Petroleum Research Group, Infracambrian/Early Palaeozic Field Guide Series 1 und Beringeria Special Issue 6: 7-46.

Geyer, G., & Landing, E. 2006. Ediacaran–Cambrian depositional environments and stratigraphy of the western Atlas regions. In: Geyer, G. & Landing, E. (Hrsg.). Morocco 2006 – Ediacaran–Cambrian depositional environments and stratigraphy of the western Atlas regions. UCL Maghreb Petroleum Research Group, Infracambrian/Early Palaeozic Field Guide Series 1 und Beringeria Special Issue 6: 47–120.

Geyer, G. 2006. First African oryctocephalid trilobites from the Lower–Middle Cambrian boundary interval. Palaeoworld, 15: 348–359.

Geyer, G. 2005. The Fish River Subgroup in Namibia – Stratigraphy, depositional environments and the Proterozoic-Cambrian boundary problem revisited. Geological Magazine, 142 (5): 465-498.

Landing, E., Peng Sh. Ch., Babcock, L. E., Geyer, G. & Mozydlowska-Vidal, M. 2005.  Global standard names for the Lowermost Cambrian Series and Stage. Episodes, 30 (4): 287–289.

Geyer, G., Hautmann, M., Hagdorn, H., Ockert W. & Streng, M. 2005. Well-preserved molluscs from the Lower Keuper (Ladinian) of Hohenlohe (Southwest Germany). Paläontologische Zeitschrift, 79 (4): 429-460, 17 Abb.; Stuttgart.

Geyer, G. 2005. The base of a revised Middle Cambrian: are suitable concepts for a series boundary in reach? Geosciences Journal (Seoul), 9 (2): 81–99.

Babcock, L. E., Peng, S. C., Geyer, G. & Shergold, J. H. 2005. Changing perspectives on Cambrian chronostratigraphy and progress toward subdivision of the Cambrian System. Geosciences Journal (Seoul), 9 (2): 101–106.

Niebuhr, B. & Geyer, G. 2005. Beringers Lügensteine: 493 Corpora Delicti zwischen Dichtung und Wahr­heit. Beringeria, Sonderheft 5: 188 S.

2000–2004

Geyer, G., Popp, A., Weidner, T. & Förster, L. 2004. New Lower Cambrian trilobites from Pleistocene erratic boulders of northern Germany and Denmark and their bearing on the intercontinental correlation. Paläontologische Zeitschrift, 78 (1): 127–135.

Geyer, G. 2004. Correlation in the Cambrian: puzzling facts or wrong concepts? In: Peng, S. C., Babcock, L. E. & Zhu M. Y. (Hrsg.). Cambrian System of South China. Palaeoworld, 13: 87–98.

Geyer, G. & Landing, E. 2004. A unified Lower-Middle Cambrian chronostratigraphy for West Gondwana. Acta Geologica Polonica, 54 (2): 179-218, 7 Abb.; Warschau.

Shergold, J. & Geyer, G. 2003. The Subcommission on Cambrian Stratigraphy: the status quo. Geologica Acta, 1 (1): 5–9.

Álvaro, J. J., Elicki, O., Geyer, G., Rushton, A. W. A. & Shergold, J. H. 2003. Palaeogeographic control on the Cambrian trilobite immigration and evolutionary pattern reported in the western Gondwana margin. Palaeogeography, Palaeoclimatology, Palaeoecology, 195: 5-35, 6 Abb.; Amsterdam.

Geyer, G. 2002. Die Geologie von Unterfranken und den angrenzenden Gebieten. Fränkische Landschaft. Arbeiten zur Geographie von Franken, 2: 588 S., Gotha (Justus Perthes Verlag).

Landing, E., Geyer, G. & Bartowski, K. E. 2002. Latest Early Cambrian small shelly fossils, trilobites, and Hatch Hill dysaerobic interval on the Québec continental slope. Journal of Paleontology, 76: 287–305.

Geyer, G., Hagdorn, H. & Kelber, K.-P. 2002. Muschelkalk und Keuper in Nord-Württemberg und Unter­franken. In: Niebuhr, B. (Hrsg.). Geo 2002 – Planet Erde: Vergangenheit, Entwicklung, Zukunft. Schriftenreihe der Deutschen Geologischen Gesellschaft, 22: 45-87; Hannover.

Geyer, G. & Landing, E. 2001. Middle Cambrian of Avalonian Massachusetts: stratigraphy and correlation of the Braintree trilobites. Journal of Paleontology, 75 (1): 116–135.

Shergold, J. & & Geyer, G. 2001. The International Subcommission on Cambrian Stratigraphy: Progress Report 2001. In: Zhu, M. Y, Van Iten, H., Peng, S. C. & Li, G. X. (Hrsg.). The Cambrian of South China. Acta Palaeontologica Sinica, 40, Suppl.: 1–3.

Steiner, M., Zhu, M.Y., Weber, B. & Geyer, G. 2001. The Lower Cambrian of eastern Yunnan: trilobite-based biostratigraphy and related faunas. In: Zhu, M. Y, Van Iten, H., Peng, S. C. & Li, G. X. (Hrsg.). The Cambrian of South China. Acta Palaeontologica Sinica, 40, Suppl.: 63–79.

Geyer, G. & Shergold, J. H. 2000. The quest for internationally recognized divisions of Cambrian time. Episodes, 23 (3): 188–195.

Brasier, M. & Geyer, G. 2000. Cambrian. In: Explanatory note to the International Stratigraphic Chart. Division of Earth Sciences, UNESCO: 9, Paris (IUGS Publications).

1995–1999

Peng, S.C., Geyer, G. & Hamdi, B. 1999. Trilobites from the Shahmirzad section, Alborz Mountains, Irans: Their taxonomy, biostratigraphy and bearing for international correlation. Beringeria, 24: 3–64.

Geyer, G. 1999. Gastropoda. In: Singer, R. S. (Hrsg.). Encyclopedia of Paleontology. Volume 1, A‒L: 508–511, Chicago, London (Fitzroy Dearborn Publishers).

Geyer, G. & Streng, M. 1998. Middle Cambrian pelecypods from the Anti-Atlas, Morocco. Revista Española de Paleontología, numero extraordinario Homenaje al Prof. Gonzalo Vidal: 83–96.

Mergl, M., Geyer, G. & El-Attari, A. 1998. The billingsellid genus Saccogonum (Brachiopoda) from the Moroccan Cambrian and its significance for the regional geology and stratigraphy. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 209 (3): 273–293.

Geyer, G. 1998. Intercontinental, trilobite-based correlation of the Moroccan early Middle Cambrian. Canadian Journal of Earth Sciences, 35: 374–401.

Landing, E., Bowring, S. A., Davidek, K., Westrop, S. R., Geyer, G. & Heldmaier, W. 1998. Duration of the Early Cambrian: U-Pb ages of volcanic ashes from Avalon and Gondwana. Canadian Journal of Earth Sciences, 35: 329–338.

Geyer, G. 1998. Die kambrische Explosion. Paläontologische Zeitschrift, 72 (1/2): 7–30.

Geyer, G. & Wiefel, H. 1998. Fränkisch-Thüringisches Schiefergebirge. In: Stratigraphische Kommission Deutschlands (Hrsg.). Stratigraphie von Deutschland II. Ordovizium, Kambrium, Vendium, Riphäikum. Teil I: Thüringen, Sachsen, Ostbayern. Courier Forschungsinstitut Senckenberg, 200: 56–102. [„1997“].

Chang W. T., Repina, L. N. & Geyer, G. 1997. Suborder Redlichiina Richter, 1932. In: Whittington, H. B. (Hrsg.). Treatise on Invertebrate Paleontology, Part O, Arthropoda 1, Trilobita, Revised, Volume 1: Introduction, Order Agnostida, Order Redlichiida: 429–470, Boulder, CO (The Geological Society of America), Lawrence, KS (The University of Kansas Press).

Geyer, G. & Malinky, J. M. 1997. Middle Cambrian fossils from Tizi n'Tichka, the High Atlas, Morocco. Part 1. Introduction and trilobites. Journal of Paleontology, 71 (4): 620–637.

Marek, L., Malinky, J. M. & Geyer, G. 1997. Middle Cambrian fossils from Tizi n’Tichka, the High Atlas, Morocco. Part 2. Hyoliths. Journal of Paleontology, 71 (4): 638–656.

Geyer, G. & Mergl, M. 1997. Protorthacean brachiopods from the Middle Cambrian of Morocco. Journal of Paleontology, 71 (5): 791–812.

Geyer, G. 1996. Die unterkambrischen Trilobiten von Görlitz. Natur und Landschaft in der Niederlausitz, 17: 84–94.

Geyer, G. 1996. The Moroccan fallotaspidid trilobites revisited. Beringeria, 18: 89–199.

Shu D.-G., Zhang, X.-L. & Geyer, G. 1996. Anatomy and systematic affinities of the Lower Cambrian bivalved arthropod Isoxys auritus. Alcheringa, 19: 333–342.

Geyer, G., Landing, E. & Heldmaier, W. 1995. Faunas and depositional environments of the Cambrian of the Moroccan Atlas region. In: Geyer, G. & Landing, E. (Hrsg.). MOROCCO ‘95 – the Lower-Middle Cambrian standard of western Gondwana. Beringeria Special Issue 2: 47–119.

Geyer, G. & Uchman, A. 1995. Ichnofossil assemblages from the Nama Group (Neoproterozoic-Lower Cambrian) in Namibia and the Proterozoic-Cambrian boundary problem revisited. In: Geyer, G. & Landing, E. (Hrsg.). MOROCCO ‘95 – the Lower-Middle Cambrian standard of western Gondwana. Beringeria Special Issue 2: 175–202.

Shu Degan, Geyer, G., Chen Ling & Zhang Xinliang (1995. Redlichiacean trilobites with preserved soft-parts from the Lower Cambrian Chengjiang fauna (South China). In: Geyer, G. & Landing, E. (Hrsg.). MOROCCO ‘95 – the Lower-Middle Cambrian standard of western Gondwana. Beringeria Special Issue 2: 203–241.

Landing, E., Geyer, G. & Heldmaier, W. 1995. First African lapworthellid: Lapworthella vandali n. sp. from the Lower-Middle Cambrian boundary interval of Morocco. In: Geyer, G. & Landing, E. (Hrsg.). MOROCCO '95 – the Lower-Middle Cambrian standard of Gondwana. Beringeria Special Issue 2: 243–253.

Geyer, G., Heldmaier, W. & Landing, E. 1995. Arthropod traces in the Middle Cambrian of Morocco. In: Geyer, G. & Landing, E. (Hrsg.). MOROCCO '95 – the Lower-Middle Cambrian standard of western Gondwana. Beringeria Special Issue 2: 254.

Geyer, G. & Palmer, A. R. 1995. Neltneriidae and Holmiidae (Trilobita) from Morocco and the problem of Early Cambrian intercontinental correlation. Journal of Paleontology, 69 (3): 459-474.

Geyer, G. & Elicki, O. 1995. The Lower Cambrian trilobites from the Görlitz Synclinorium (Germany) – review and new results. Paläontologische Zeitschrift, 69 (1/2): 85–117.

Geyer, G. & Mergl, M. 1995. Mediterranean representatives of the obolellid Trematobolus (Brachiopoda) and a review of the genus. Paläontologische Zeitschrift, 69 (1/2): 179–209.

1990–1994

Geyer, G. 1994. An enigmatic bilateral fossil from the Lower Cambrian of Morocco. Journal of Paleontology, 68 (4): 710–716.

Geyer, G. 1994. A new obolellid brachiopod from the Lower Cambrian of Morocco. Journal of Paleontology, 68 (5): 995–1002.

Geyer, G. 1994. Cambrian corynexochid trilobites from Morocco. Journal of Paleontology, 68 (6): 1306–1320.

Geyer, G. 1994. Middle Cambrian mollusks from Idaho and early conchiferan evolution. In: Landing, E. (Hrsg.). Studies in Stratigraphy and Paleontology in Honor of Donald W. Fisher. N. Y. State Museum Bulletin, 481: 69–86.

Geyer, G. 1993. The giant Cambrian trilobites of Morocco. Beringeria, 8: 71–107.

Geyer, G. 1992. A re-evaluation of Blayacina Cobbold 1932 and Thoralaspis Hupé 1953 (Trilobita: Redlichiida). Paläontologische Zeitschrift, 66 (1/2): 99–113.

Berneker, E. & Geyer, G. 1990. The Oued Boutergui section, western Anti-Atlas: Cambrian strati­graphy, fossil distribution, and depositional history. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte, 1990 (7): 385–403.

Geyer, G. & Kukla, P. A. 1990. An unusual new Lepidopleurid polyplacophoran from the Germanic Muschelkalk (Triassic). Journal of Paleontology, 64 (2): 222–228.

Geyer, G. 1990. Die marokkanischen Ellipsocephalidae (Trilobita: Redlichiida). Beringeria, 3: 1–363.

Geyer, G. 1990. Correlation along the Lower/Middle Cambrian boundary – a puzzling story with an elusory end? In: Repina, L. N. & Zhuravlev, A. Yu. (Hrsg.). Tretiy mezhdunarodnyy simpozium po kembryskoy sisteme. 1-9 avgusta 1990 g., SSSR, Novosibirsk. Tezisy dokladov: 100–102, Novosibirsk (Nauka).

Geyer, G. 1990. Proposal of formal lithostratigraphical units for the Terminal Proterozoic to early Middle Cambrian of southern Morocco. Newsletters on Stratigraphy, 22 (2/3): 87–109.

Geyer, G. 1990. Revised Lower to lower Middle Cambrian biostratigraphy of Morocco. Newsletters on Stratigraphy, 22 (2/3): 53–70.

Geyer, G. 1990. Quo vadis, Schilfsandstein? Jahresberichte und Mitteilungen der oberrheinischen geologischen Vereinigung, N. F., 72: 319–322.

prior to 1990

Kelber, K.-P. & Geyer, G. 1989. Lebensspuren von Insekten an Pflanzen des Unteren Keupers. Courier Forschungsinstitut Senckenberg, 109: 165–174.

Stepanek, J. & Geyer, G. 1989. Spurenfossilien aus dem Kulm (Unterkarbon) des Frankenwaldes. Beringeria, 1: 1–55.

Geyer, G. 1989. Late Precambrian to early Middle Cambrian lithostratigraphy of southern Morocco. Beringeria, 1: 115–143.

Geyer, G. 1989. Fauna und Ablagerungsmilieu im Bereich des Schilfsandsteins, eine Erwiderung. Jahresberichte und Mitteilungen der oberrheinischen geologischen Vereinigung, N. F. 71: 405–412.

Sdzuy, K. & Geyer, G. 1988. The base of the Cambrian in Morocco. In: Jacobshagen, V. H. (Hrsg.). The Atlas System of Morocco. Studies on its Geodynamic Evolution. Lecture Notes in Earth Sciences, 15: 91–106, Berlin, Heidelberg, New York, London, Paris, Tokyo (Springer).

Geyer, G. & Herbig, H.-G. 1988. New Eocene oysters and the final regression at the southern rim of the central High Atlas (Morocco). Géobios, 21 (6): 663–691.

Geyer, G. 1988. Agnostida aus dem höheren Unterkambrium und dem Mittelkambrium von Marokko. Teil 1: Agnostina. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte, 1988 (3): 141–152.

Geyer, G. 1988. Agnostida aus dem höheren Unterkambrium und dem Mittelkambrium von Marokko. Teil 2: Eodiscina. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 177 (1): 93–133.

Geyer, G. & Kelber, K.-P. 1987. Flügelreste und Lebensspuren von Insekten aus dem Unteren Keuper Mainfrankens. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 174 (3): 331–355.

Geyer, G. 1987. Die Fossilien der Modiola-Bank Frankens (Karn, Gipskeuper, km 1γ). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 173 (3): 271-302.

Geyer, G. 1986. Mittelkambrische Mollusken aus Marokko und Spanien. Senckenbergiana lethaea, 67 (1/4): 55–118.

Geyer, G. 1983. Feinstratigraphische Untersuchungen an einem Lößprofil bei Forst (TK 25, Nr. 5928 Obertheres, Mainfranken). Weltenburger Akademie, Erwin Rutte-Festschrift: 89–97.

Non-peer-reviewed, conference abstracts (selected examples)

Geyer, G. 2019. Early expedition’s into Morocco’s past: The first discoveries of Cambrian trilobites in Africa. Trilobite Papers, 22: 20–29.

Landing, E. & Geyer, G. 2019. An early Cambrian greenhouse climate.  RE: Overused “greenhouse climate” paradigm: consequence for ancient climate synthesis. Science Advances 4, eaar5690 (2018), letter.

Linnemann, U., Ovtcharova, M., Schaltegger, U., Gärtner, A., Hautmann, M., Geyer, G., Vickers-Rich, P., Rich, T., Plessen, B., Hofmann, M., Zieger, J., Krause, R., Kriesfeld, L., & Smith, J. 2018. New high-resolution age data from the Ediacaran–Cambrian boundary (South Namibia) indicate rapid, ecologically driven onset of the Cambrian explosion. In: ICECS2018, International Conference on Ediacaran and Cambrian Sciences. Joint Meeting of International Subcommission on Cambrian Stratigraphy (ISCS), International Subcommission on Ediacaran Stratigraphy (ISES), 12^th–16^th August 2018, Xi’an, Programme, Abstract: 53–54, Xian.

Geyer, G. & Landing, E. 2018. An exploring expedition to the world’s oldest trilobites. In: ICECS2018, International Conference on Ediacaran and Cambrian Sciences. Joint Meeting of International Subcommission on Cambrian Stratigraphy (ISCS), International Subcommission on Ediacaran Stratigraphy (ISES), 12^th–16^th August 2018, Xi’an, Programme, Abstract: 66–70, Xian.

Geyer, G. 2018. Solenopleura, Parasolenopleura and related conundrums. In: ICECS2018, International Conference on Ediacaran and Cambrian Sciences. Joint Meeting of International Subcommission on Cambrian Stratigraphy (ISCS), International Subcommission on Ediacaran Stratigraphy (ISES), 12^th–16^th August 2018, Xi’an, Programme, Abstract: 116–117, Xian.

Geyer, G. 2018. A century ago. Articles on trilobites or trilobite-related publications of 1918. In: Sundberg, F. (Hrsg.). The Trilobite Papers 20. An international newsletter for and by trilobite paleontologists: 9–17; Show Low, AZ.

Geyer, G. 2017. The world:s oldest trilobites? A new look to the earliest known trilobites from the Anti-Atlas of Morocco. In: Pärnaste, H. (Hrsg.). 6^th International Conference on Trilobites and Their Relatives, Tallinn, Estonia, 2017. Abstracts: 18–19, Tallinn.

Geyer, G. 2017. Final fanfare: an ultimate glance to the Lower-Middle Cambrian boundary dilemma. In: Mcllroy, D. (Hrsg.). International Symposium on the Ediacaran–Cambrian Transition 2017. Abstract Volume: 33, St. John’s, Nfld.

Landing, E., Geyer, G. & Buatois, L. 2017. 25 years of practical success of the basal Cambrian GSSP at Fortune Head, Eastern Newfoundland. In: Mcllroy, D. (Hrsg.). International Symposium on the Ediacaran–Cambrian Transition 2017. Abstract Volume: 58, St. John’s, Nfld.

Landing, E., Schmitz, M., Geyer, G. & Bowring, S. A. 2017. Precise U-Pb volcanic zircon dates show diachroneity of oldest Cambrian trilobites: Examples from the West Gondwana (southern Morocco) and Avalonia paleocontinents. In: Mcllroy, D. (Hrsg.). International Symposium on the Ediacaran–Cambrian Transition 2017. Abstract Volume: 59, St. John’s, Nfld.

Landing, G., Myrow, P.M., Narbonne, G.M., Geyer, G., Buatois, L.A., Mángano, M.G., Kauffman, A., Westrop, S.R., Kröger, B., Laing, B. & Gougeon, R. 2017. Ediacaran–Cambrian of Avalonian Eastern Newfoundland (Avalon, Burin, and Bonavista Peninsulas). International Symposium on the Ediacaran–Cambrian Transition, Field Trip 4. Open File NFLD/3323, 169 S., St. John’s (Memorial University & Geological Survey of Canada and Labrador).

Geyer, G. 2017. Cambrian rocks in Germany: rare, neglected and misunderstood, but critical for comprehending the nucleus of Western Europa. Helling, S. & Hartenfels, S. 88. Jahrestagung der Paläontologischen Gesellschaft, Münster 26.-30. März 2017, Programm – Kurzfassungen. Münster. Forsch. Geologie und Paläontologie, 109: 43.

Landing, E., Kouchinsky, A., Westrop, S.R., Geyer, G., & Bowring, S.A. 2015. 10 m.y. evolutionary stasis of earliest Cambrian (Terreneuvian) mollusk-rich faunas and Cambrian evolutionary radiation correlations. GSA Annual Meeting 2015, Abstracts and Program, 47 (7): 27.

Geyer, G. 2015. Cambrian subdivisions’ last chapter: examination of the Cambrian Stage 4 lower boundary candidates. Berichte des Instituts für Erdwissenschaften, Karl-Franzens-Universität Graz, 21: 128.

Geyer, G. 2015. Considerations on the Precambrian Phanerozoic and Ediacaran Cambrian boundary: a historic approach to an unresolvable dilemma. Berichte des Instituts für Erdwissenschaften, Karl-Franzens-Universität Graz, 21: 129.

Landing, E., Geyer, G. & Buatois, L. 2015. Demonstrated Long-Term Utility of the Basal Cambrian GSSP at Fortune Head, Eastern Newfoundland. Berichte des Instituts für Erdwissenschaften, Karl-Franzens-Universität Graz, 21: 218.

Zhang, X.L., Geyer, G. et al. 2015. Appearance of trilobites during the Cambrian Explosion: a discussion on the definition of the Cambrian Series 2 and Stage 3. Berichte des Instituts für Erdwissenschaften, Karl-Franzens-Universität Graz, 21: 425.

Geyer, G. 2014. Cambrian rocks of the Franconian Forest prove shallow marine deposition during a shift from West Gondwanan to sub-Baltican position. In: Röhling, G.-H. & Zulauf, G. (Hrsg.). GeoFrankfurt 2014 – Dynamik des Systems Erde/Earth Dynamics System. Abstract Volume. Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften, 85: 178.

Geyer, G. 2014. Love Labour’s Lost for a Golden Spike? The perpetual inability to find a position for the base of Cambrian’s Series 3and Stage 5. In: Röhling, G.-H. & Zulauf, G. (Hrsg.). GeoFrankfurt 2014 – Dynamik des Systems Erde/Earth Dynamics System. Abstract Volume. Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften, 85: 179.

Landing, E., Geyer, G., Brasier, M.D. & Bowring, S.A. 2013. Proposed base of global Cambrian Series 2 and Stage 3: A Carbon-isotope and biostratigraphic definition for the upper part of the traditional lower Cambrian. Proposal, International Subcommission on Cambrian Stratigraphy: 55 Seiten.

Landing, E., Geyer, G., Brasier, M.D. & Bowring, S.A. 2013. Base of global Cambrian Stage 2. Carbon isotope-biostratigraphic definition and correlation of the upper stage of the Terreneuvian Series. Proposal, International Subcommission on Cambrian Stratigraphy: 51 Seiten.

Pfänder, J. A., Sperner, B., Ratschbacher, L., Jung, S., Friedlein, V., Geyer, G., Krause, T., Rohrmüller, J. & Kunzmann, T. 2012. High-resolution Ar-Ar dating of volcanic rocks from Central and Southern Germany - methodical limitations and a (preliminary) re-evaluation of timing of volcanic activity within Central Europe. European Mineralogical Conference 2012, Vol. 1: 538, Frankfurt a. M.

Geyer, G. & Vincent, A. S. 2012. The Paradoxides Theorem: Staggered FAD of species proves high resolution of Moroccan rock successions. In: Zhao, Y. L., Zhu, M. Y., Peng, J., Gaines, R.R. & Parsley, R. L. (Hrsg.). Cryogenian – Ediacaran to Cambrian Stratigraphy and Paleontology of Guizhou, China. The 17^th Field Conference of the Cambrian Stage Subdivision Working Group, International Subcommission on Cambrian Stratigraphy and Celebration of the 30^th Anniversary of the Discovery of the Kaili Biota, Guizhou 2012. Journal of Guizhou University, Natural Sciences, 29 (Sup. 1): 162–163, Guiyang.

Geyer, G. & Elicki, O. 2012. The Lower‑Middle Cambrian boundary interval of Jordan: fossil assemblages, their stratigraphic significance and bearing on intercontinental correlation. In: Zhao, Y. L., Zhu, M. Y., Peng, J., Gaines, R.R. & Parsley, R. L. (Hrsg.). Cryogenian – Ediacaran to Cambrian Stratigraphy and Paleontology of Guizhou, China. The 17^th Field Conference of the Cambrian Stage Subdivision Working Group, International Subcommission on Cambrian Stratigraphy and Celebration of the 30^th Anniversary of the Discovery of the Kaili Biota, Guizhou 2012. Journal of Guizhou University, Natural Sciences, 29 (Sup. 1): 163, Guiyang.

Landing, E. & Geyer, G. 2012. Misplaced faith—limitations of the first appearance datum (FAD) in chronostratography and proposal of more robust Lower Cambrian correlation standards. In: Zhao, Y. L., Zhu, M. Y., Peng, J., Gaines, R.R. & Parsley, R. L. (Hrsg.). Cryogenian – Ediacaran to Cambrian Stratigraphy and Paleontology of Guizhou, China. The 17^th Field Conference of the Cambrian Stage Subdivision Working Group, International Subcommission on Cambrian Stratigraphy and Celebration of the 30^th Anniversary of the Discovery of the Kaili Biota, Guizhou 2012. Journal of Guizhou University, Natural Sciences, 29 (Sup. 1): 170–171, Guiyang.

Streng, M., Geyer, G. & Budd, G. E. 2006. A bone bed without bones: the Middle Cambrian ‘fragment limestone’ of Scania, Sweden. 50th Palaeontological Association Annual Meeting, December 18-21 2006, Abstracts with Programme: 72, Sheffield (Department of Animal & Plant Sciences, University of Sheffield).

Geyer, G. & Buschmann, B. 2006. A new earliest Middle Cambian faunule from Saxony (Germany) and its bearing on the tectonostratigraphic history of the Saxothuringian domain. In: Jago, J. B. (ed.), South Australia 2006. XI International Conference of the Cambrian Stage Subdivision Working Group. Geo­logical Society of Australia, Abstracts Number 84: 14–15.

Geyer, G. & Heuse, T. 2005. Die neuen Perspektiven für die Chronostratigraphie des Kambriums und die Stellung von in Deutschland vorkommenden kambrischen Einheiten. In: Freiwald, A., Röhling, H.-G. & Löffler, S.-B. (Hrsg.). GeoErlangen 2005: System Earth-Biosphere Coupling. Regional Geology of Central Europe. September 24-29, 2005 Erlangen. Program and Abstracts. Schriftenreihe der Deutschen Gesellschaft für Geowissenschaften, 39: 133–134.

Niebuhr, B. & Geyer, G. 2005. Beringers Lügensteine – 493 Corpora Delicti zwischen Dichtung und Wahrheit. Berichte des Institutes für Erdwissenschaften, Karl-Franzens-Universität Graz, 17: 83–86.

Geyer, G. 2005. The Fish River Subgroup in Namibia and the Proterozoic-Cambrian boundary revisited. Acta Micropalaeontologica Sinica, 22, Supplement: 51.

Geyer, G. 2005. The trilobite-bearing Early Cambrian: characteristics of an unnamed series. Acta Micropalaeontologica Sinica, 22, Supplement: 52.

Landing, E. & Geyer, G. 2005. Epeirogenic and eustatic controls on Lower-Middle Cambrian boundary successions in West Gondwana – a key for global sea-level fluctuations at the Lower-Middle Cambrian transition. Acta Micropalaeontologica Sinica, 22, Supplement: 87g.

Geyer, G. 2004. The base of a revised Middle Cambrian: are suitable concepts for a series boundary in reach? In: Choi, D. K. (Hrsg.). Korea 2004. IX International Conference of the Cambrian Stage Subdivision Working Group. Abstracts with Program: 8–9, Taebaek.

Geyer, G. & Landing, E. 2002. The Bani Stage and its significance for Cambrian intercontinental correlation. In: Álvaro, J. J. & Clausen, S. (Hrsg.). VIII Conference of the Cambrian Stage Subdivision Working Group, Caunes-Minervois, September 12-14, 2002, Programme and Abstracts: 17, Lille.

Geyer, G., Landing, E. & Shergold, J. H. 2002. New data on the Upper Cambrian of Morocco. In: Álvaro, J. J. & Clausen, S. (Hrsg.). VIII Conference of the Cambrian Stage Subdivision Working Group, Caunes-Minervois, September 12-14, 2002, Programme and Abstracts: 18, Lille.

Álvaro, J. J., Elicki, O., Geyer, G., Rushton, A.W.A. & Shergold, J. H. 2002. Paleogeographic maps of Cambrian basins: the western Gondwana margin. - In: Álvaro, J. J. & Clausen, S. (Hrsg.). VIII Conference of the Cambrian Stage Subdivision Working Group, Caunes-Minervois, September 12-14, 2002, Programme and Abstracts: 33–34, Lille.

Geyer, G. 2000-2002. [Geologische, paläontologische und mineralogische Stichwörter]. In: Lexikon der Geographie; Heidelberg (Spektrum-Verlag).

Geyer, G. & Landing, E. 2000. The Cambrian of Israel and Jordan – the feather edge of the Mediterranean Realm. In: Aceñolaza, G. F. & Peralta, S. (Hrsg.). Cambrian from the southern edge. Instituto Superior de Correlacion Geológica (INSUGEO), Miscelánea 6: 98–101, Tucumán (Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Naturales e Instituto Miguel Lillo, Univer­sidad de Tucumán).

Geyer, G. 1999. The Lower-Middle Cambrian faunal turnover – reality or sampling artifact? In: Chen, J. Y., Chien, P. K., Bottjer, D. J., Li, G. X. & Gao, F. (Hrsg.). International Symposium "The Origins of Animal Body Plans and Their Fossil Records". Early Life Research Center: 20–21, Kunming.

Geyer, G. 1997. New data on the fallotaspidids and their bearing on olenelloid phylogeny. Second International Trilobite Conference, Brock University, St. Catherines, Ontario, August 22-25, 1997, Abstracts with Program: 23–24, St. Catherines, Ontario.

Shu, D.G., Zhang, X. L., Chen, L. & Geyer, G. 1996. New Early Cambrian deuterostomes. In: 30th International Geological Congress, Abstracts, Vol. 2: 127, Beijing.

Geyer, G. 1996. The Cambrian history of western Gondwana – is it well understood? – In: Liñán, E, Gámez Vintaned, J. A. & Gozalo, R. (Hrsg.). II Field Conference of the Cambrian Stage Subdivision Working Groups. Spain, 13-21 September 1996. Field Trip Guide and Abstracts: 103–104, Zaragoza.

Shu, D.G., Chen, L., Zhang, X. L. & Geyer, G. 1995. Redlichiacean trilobites with preserved soft parts from the Chengjiang fossil lagerstätte. In: Chen, J. Y., Edgecombe, G. & Ramsköld, L. (Hrsg.). International Cambrian Explosion Symposium (April, 1995, Nanjing), Programme and Abstracts: 26–28, Nanjing.

Shu, D. G., Chen, L., Zhang, X. L. & Geyer, G. 1995. An evolutionary link to brachiopods. In: Chen, J. Y., Edgecombe, G. & Ramsköld, L. (Hrsg.). International Cambrian Explosion Symposium (April, 1995, Nanjing), Programme and Abstracts: 28–29, Nanjing.

Shu, D.G., Zhang, X. L., Chen, L. & Geyer, G. 1995. Restudy of Yunnanozoon and Vetulicola. In: Chen Junyuan, Edgecombe, G. & Ramsköld, L. (Hrsg.). International Cambrian Explosion Symposium (April, 1995, Nanjing), Programme and Abstracts: 29-31, Nanjing.

Shu, D. G., Zhang, X. L. & Geyer, G. 1995. Anatomy and systematic affinities of Isoxys. In: Chen Junyuan, Edgecombe, G. & Ramsköld, L. (Hrsg.). International Cambrian Explosion Symposium (April, 1995, Nanjing), Programme and Abstracts: 31-33, Nanjing.

Zhang, X. L., Shu, D. G. & Geyer, G. 1995. A new genus of naraoiids. In: Chen, J.Y., Edgecombe, G. & Ramsköld, L. (Hrsg.). International Cambrian Explosion Symposium (April, 1995, Nanjing), Programme and Abstracts: 33–34, Nanjing.

Geyer, G. 1994. The Proterozoic-Cambrian transition in the Nama Group, Namibia, and its implications for the Proterozoic-Cambrian boundary – review and new results. Second Circum-Atlantic Circum-Pacific Terrane Conference, Cape Breton Island, Program & Abstracts: 17, Antigonish, N. S.

Geyer, G. 1993. Untersuchungen zur Lithostratigraphie, Ablagerungsgeschichte und Paläontologie der Nama-Gruppe. In: Lorenz, V. et al.: Das Vulkanfeld Gross Brukkaros (Gibeon-Provinz, Süd-Namibia): Vulka­nologie, Altersbeziehungen und Reliefentwicklung – erste Ergebnisse. Zentralblatt für Geologie und Paläontologie, Teil I, 1993 (3/4): 241–243.

Geyer, G. & Erdtmann, B.-D. 1991. Third International Symposium on the Cambrian System 1990. Paläontologie aktuell, 23: 34–36.

Geyer, G. 1989. “Supercycles” and Complex Cyclicity in the Late Precambrian and Cambrian of Morocco. 28th International Geological Congress, Washington, Abstracts, 3: 3-470; Washington, D. C.

Geyer, G. 1988. Complementary notes on the Precambrian-Cambrian transition in Morocco. In: Landing, E., Narbonne, G. M. & Myrow, P. (Hrsg.). Trace Fossils, Small Shelly Fossils and the Precambrian-Cambrian Boundary, Proceedings, August 8-18, 1987, Memorial University. New York State Musum/Geological Survey Bulletin, 463: 12–13, Albany, N. Y.

Geyer, G. 1987. Complementary notes on the Precambrian-Cambrian transition in Morocco. Preprint for Landing, E. & Narbonne, G. M. (Hrsg.). Trace fossils, small shelly fossils, and the Precambrian-Cambrian Boundary -Proceedings-, August 8-18, 1987, St. John's, Newfoundland, New York State Museum Bulletin, 463: 42–43, Albany, N. Y. (University of the State New York, State Education Dept.).

Sdzuy, K. & Geyer, G. 1986. Die Basis des Kambrium in Marokko. Nachrichten der deutschen geologischen Gesellschaft, 35, Kurzfassung 138. Hauptversammlung DGG 1986: 73–74.

Geyer, G., Landing, E. & Żylińska, A. (2021): A new look at Eccaparadoxides (Cambrian, Trilobita) and its biostratigraphic significance. PalZ, 42 S., https://doi.org/10.1007/s12542-021-00580-9.