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Plectatrypinae and other ribbed atrypides succeeding the end Ordovician extinction event, Central Oslo Region, Norway

Published online by Cambridge University Press:  22 September 2020

B. Gudveig Baarli*
Department of Geosciences, Williams College, 947 Main Street, Williamstown, MA01267USA


Strata of the Solvik Formation in the central Oslo Region (upper Hirnantian through most of Aeronian) are very fossiliferous and provide a good record relating to the survival and recovery faunas after the end-Ordovician mass extinctions. The ribbed atrypide fauna is especially rich with 21 species present. Samples from most of these taxa have been sectioned to reveal internal structures for taxonomic study. Of these, 13 species belong to the family Atrypidae, three of which are described in the present paper; Dihelictera engerensis n. sp., Gotatrypa vettrensis n. sp., and Rhinatrypa henningsmoeni n. gen. The family Atrypidae follows a global pattern of recovery with an increase in diversity registered in upper Rhuddanian and further diversification in Aeronian strata. The focus of this paper is the family Atrypinidae, which shows a different pattern. They are common and fairly diverse near the base of the Rhuddanian in deeper waters and rare further up, especially in the Aeronian. One new genus, Bockeliena, and two new species, Plectatrypa rindi and Euroatrypa? sigridi are defined. The relationship between the subfamilies Spirigerininae and Plectatrypinae is clarified through thin sections of material from the Ordovician/Silurian boundary layers. The plectatrypids originated in Baltica through transitional species found in upper Katian to Hirnantian strata leading from the cosmopolitan Eospirigerina to the Plectatrypa lineage with imbricate ribbing and, separately, to Bockeliena and others with lamellose, widely spaced ornamentation. The Oslo Region probably acted as a nexus for survival and spread of brachiopods after the end-Ordovician mass extinction.


Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Paleontological Society

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Aldridge, R., Jeppsson, L., and Dorning, K., 1993, Early Silurian oceanic episodes and events: Journal of the Geological Society, v. 150, p. 501513.CrossRefGoogle Scholar
Alikhova, T., 1954, Gotlandian brachiopods, in Alikhova, T. Balashova, E., and Balashov, Z., eds., Field Atlas of Characteristic Faunal Complexes of the Ordovician and Gotlandian of the Southern Lithuanian SSR: Leningrad, TrudyVSEGEI, p. 3543. [in Russian]Google Scholar
Amsden, T.W., 1974, Late Ordovician and early Silurian articulate brachiopods from Oklahoma southwestern Illinois, and eastern Missouri: Oklahoma Geological Survey Bulletin, v. 119, 154 p.Google Scholar
Baarli, B.G., 1985, The stratigraphy and sedimentology of the early Llandovery Solvik Formation in the central Oslo region, Norway: Norsk Geologisk Tidsskrift, v. 65, p. 255275.Google Scholar
Baarli, B.G., 1986, A biometric re-evaluation of the Silurian brachiopod lineage Stricklandia lens/S. laevis: Palaeontology, v. 29, p. 187205.Google Scholar
Baarli, B.G., 1987, Benthic faunal associations in the Lower Silurian Solvik Formation of the Oslo-Asker Districts, Norway: Lethaia, v. 20, p. 7590.CrossRefGoogle Scholar
Baarli, B.G., 1988a, The Llandovery enteletacean brachiopods of the central Oslo region, Norway: Palaeontology, v. 31, p. 11011129.Google Scholar
Baarli, B.G., 1988b, Bathymetric co-ordination of proximality trends and level bottom communities: a case study from the Llandovery of central Oslo Region, Norway: Palaios, v. 3, p. 577587.CrossRefGoogle Scholar
Baarli, B.G., 1995, Orthacean and strophomenid brachiopods from the lower Silurian of the central Oslo Region: Fossils & Strata, v. 39, 93 p.Google Scholar
Baarli, B.G., 2014, The early Rhuddanian survival interval in the Lower Silurian of the Oslo Region: a third pulse of the end-Ordovician extinction: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 395, p. 2941.CrossRefGoogle Scholar
Baarli, B.G., 2019, Survival and recovery atrypid fauna following the terminal Ordovician extinction, the Atrypinae: central Oslo Region, Norway: Historical Biology, p. 138. doi: 10.1080/08912963.2019.1620228.CrossRefGoogle Scholar
Baarli, B.G., and Harper, D.A., 1986, Relict Ordovician brachiopod faunas in the Lower Silurian of Asker, Oslo Region, Norway: Norsk Geologisk Tidsskrift, v. 66, p. 8797.Google Scholar
Bassett, M.G., Popov, L.E. and Sokiran, E.V., 1999, Patterns of diversification in Ordovician cyrtomatodont rhynchonellate brachiopods: Acta-Universitatis Carolinae Geologica, v. 43, p. 329332.Google Scholar
Bergström, S.M., Saltzman, M.M., and Schmitz, B., 2006, First record of the Hirnantian (Upper Ordovician) δ13C excursion in the North American Midcontinent and its regional implications: Geological Magazine, v. 143, p. 657678.CrossRefGoogle Scholar
Bergström, S.M., Chen, X., Gutiérrez-Marco, J.C., and Dronov, A., 2009, The new chronostratigraphic classification of the Ordovician System and its relations to major regional series and stages and to δ13C chemostratigraphy: Lethaia, v. 42, p. 97107.CrossRefGoogle Scholar
Bergström, S.M., Kleffner, M., Schmitz, B., and Cramer, B.D., 2011, Revision of the position of the Ordovician-Silurian boundary in southern Ontario: regional chronostratigraphic implications of δ13C chemostratigraphy of the Manitoulin Formation and associated strata: Canadian Journal of Earth Sciences, v. 48, p. 14471470.CrossRefGoogle Scholar
Bockelie, J.F., Baarli, B.G., and Johnson, M.E., 2017, Hirnantian (latest Ordovician) glaciations and their consequences for the Oslo Region, Norway, with a revised lithostratigraphy for the Langøyene Formation in the inner Oslofjorden area: Norwegian Journal of Geology, v. 97, p. 119143.Google Scholar
Boucot, A., and Johnson, J., 1964, Brachiopods of the Ede Quartzite (Lower Llandovery) of Norderön, Jämtland: Bulletin of the Geological Institution of the University of Uppsala, v. 17, p. 111.Google Scholar
Boucot, A.J., and Johnson, J.G., 1967, Silurian and Upper Ordovician atrypids of the genera Plectatrypa and Spirigerina: Norsk Geologisk Tidsskrift, v. 47, p. 79101.Google Scholar
Boucot, A., Johnson, J., and Staton, R., 1964, On some atrypoid, retzioid, and athyridoid Brachiopoda: Journal of Paleontology, v. 38, p. 805822.Google Scholar
Brenchley, P.J., and Cocks, L.R.M., 1982, Ecological associations in a regressive sequence: the latest Ordovician of the Oslo-Asker district, Norway: Palaeontology, v. 25, p. 783815.Google Scholar
Brenchley, P. J., and Marshall, J.D., 1999, Relative timing of critical events during the late Ordovician mass extinction-new data from Oslo: Acta-Universitatis Carolinae Geologica, v. 43, p. 187190.Google Scholar
Brenchley, P.J., Marshall, J.D., Harper, D.A., Buttler, C.J., and Underwood, C.J., 2006, A Late Ordovician (Hirnantian) karstic surface in a submarine channel, recording glacio-eustatic sea-level changes: Meifod, central Wales: Geological Journal, v. 41, p. 122.Google Scholar
Calner, M., Calner, H., and Lehnert, O., 2017, The Hirnantian isotope carbon excursion (HICE) in southern Norway: Geological Society of America, Abstracts with Program, v. 49, p. 175.Google Scholar
Cocks, L.R.M., 1978, A review of British Lower Palaeozoic brachiopods. Including a synoptic revision of Davidson's monograph: Palaeontographical Society, Monograph, v. 131, 256 p.Google Scholar
Cocks, L.R.M., 2019, Llandovery brachiopods from England and Wales: Monographs of the Palaeontographical Society, v. 172, no. 652, 262 p.CrossRefGoogle Scholar
Cocks, L.R.M., and Modzalevskaya, T., 1997, Late Ordovician brachiopods from Taimyr, Arctic Russia, and their palaeogeographical significance: Palaeontology, v. 40, p. 10611094.Google Scholar
Cooper, G., 1930, New species from the Upper Ordovician of Percé: American Journal of Science, 5th series, v. 20, p. 265288.Google Scholar
Copper, P., 1973, New Siluro-Devonian atrypoid brachiopods: Journal of Paleontology, v. 47, p. 484500.Google Scholar
Copper, P., 1982, Early Silurian atrypoids from Manitoulin Island and Bruce Peninsula, Ontario: Journal of Paleontology, v. 56, p. 680702.Google Scholar
Copper, P., 1991, Evolution of the atrypid brachiopods, in McKinnon, D.I., Lee, D.E., and Campbell, J.D., eds., Brachiopods through Time: Proceedings of the 2nd International Brachiopod Congress, February 5–9, 1990, Dunedin, New Zealand: Rotterdam, A. A. Balkema, p. 3540.Google Scholar
Copper, P., 1995, Five new genera of Late Ordovician–early Silurian brachiopods from Anticosti Island, eastern Canada: Journal of Paleontology, v. 69, p. 846862.CrossRefGoogle Scholar
Copper, P., 1996, New and revised genera of Wenlock–Ludlow Atrypids (Silurian Brachiopoda) from Gotland, Sweden, and the United Kingdom: Journal of Paleontology, v. 70, p. 913923.CrossRefGoogle Scholar
Copper, P., 2004, Silurian (Late Llandovery–Ludlow) Atrypid Brachiopods from Gotland, Sweden and the Welsh Borderland, United Kingdom: Ottawa, NRC Research Press, 215p.CrossRefGoogle Scholar
Copper, P., and Gourvennec, R., 2018, Evolution of the spire-bearing brachiopods (Ordovician–Jurassic), in Copper, P., and Jin, J., eds., Brachiopods (eBook): Chapter 15, 8 p. Scholar
Dalman, J.W., 1828, Classification and description of terebratulids occurring in Sweden: Svenska Vetenskaps Akademiens Handlingar, v. 8, 88 p.Google Scholar
Davidson, T., 1869, A monograph of the British fossil Brachiopoda, Part 7, No. 3. The Silurian Brachiopoda: Palaeontographical Society Monographs, v. 22, no. 96, p. 169248.Google Scholar
Davies, J.R., Waters, R.A., Molyneux, S.G., Williams, M., Zalasiewicz, J.A., Vandenbroucke, T.R., and Verniers, J., 2013, A revised sedimentary and biostratigraphical architecture for the Type Llandovery area, Central Wales: Geological Magazine, v. 150, p. 300332.CrossRefGoogle Scholar
Fürsich, F.T., and Hurst, J.M., 1974, Environmental factors determining the distribution of brachiopods: Palaeontology, v 17, p. 879900.Google Scholar
Gill, T., 1871, Arrangements of the families of mollusks: Smithsonian Miscellaneous Collections, v. 227, p. 149.Google Scholar
Hall, J., and Clarke, J.M., 1894, An introduction to the study of the genera of Paleozoic Brachiopoda: New York State Survey, Albany, Part 2, p. 318394.Google Scholar
Hallam, A., and Wignall, P.B., 1997, Mass Extinctions and Their Aftermath: Oxford, Oxford University Press, 328 p.Google Scholar
Hammer, Ø., Harper, D.A.T., and Ryan, P.D., 2001, PAST: Paleontological statistics software package for education and data analysis: Palaeontologia Electronica, v. 4, p. 1–9, Scholar
Heath, R.A., and Owen, A.W., 1991, Stratigraphy and biota across the Ordovician–Silurian boundary in Hadeland, Norway: Norsk Geologisk Tidsskrift, v. 71, p. 91106.Google Scholar
Hiller, N., 1980, Ashgill Brachiopoda from the Glyn Ceiriog District, north Wales: Bulletin of the British Museum (Natural History), v. 34, p. 109206.Google Scholar
Howe, M., 1982, The lower Silurian graptolites of the Oslo region, in Worsley, D., ed., Proceedings IUGS Subcommission on Silurian Stratigraphy Field Meeting, Oslo Region: Paleontological Contributions from the University of Oslo, v. 278, p. 2131.Google Scholar
Huang, B., Baarli, B.G., Zhan, R.B., and Rong, J.Y., 2016, A new early Silurian brachiopod genus, Thulatrypa, from Norway and South China, and its palaeobiogeographical significance: Alcheringa, v. 40, p. 8397.CrossRefGoogle Scholar
Huang, B., Jin, J., and Rong, J.Y., 2018, Post-extinction diversification patterns of brachiopods in the early–middle Llandovery, Silurian: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 493, p. 1119.CrossRefGoogle Scholar
Johnson, M.E., and Baarli, B.G., 2018, Storm tracks predict land-to-sea sediment transfer: erosional patterns from the Upper Ordovician (Hirnantian) in the Oslo Region, Norway: The Journal of Geology, v. 126, p. 325342.CrossRefGoogle Scholar
Kaljo, D., Martma, T., Neuman, B.E., and Rønning, K., 2004, Carbon isotope dating of several uppermost Ordovician and lower Silurian sections in the Oslo Region, Norway, in Hints, O., and Ainsaar, L., eds., WOGOGOB-2004 8th Meeting on the Working Group on the Ordovician Geology of Baltoscandia, May 13–18, 2004: Tartu, Tartu University Press, p. 151.Google Scholar
Koren, T.N., and Sobolevskaya, R.F., 2008, The regional stratotype section and point for the base of the Hirnantian Stage (the uppermost Ordovician) at Mirny Creek, Omulev Mountains, Northeast Russia: Estonian Journal of Earth Sciences, v. 57, p. 110.CrossRefGoogle Scholar
Kulkov, N., and Severgina, L., 1989, Stratigraphy and brachiopods of the Ordovician and Lower Silurian of the Gorny Altai: Trudy Instituta geologii i geofiziki Sibirskogo otdeleniya Akademii Nauk SSSR, v. 717, p. 1223. [in Russian]Google Scholar
Lindström, G., 1880, Brachiopoda, in Angelin, N.P., and Lindström, G., eds., Fragmenta Silurica e dono Caroli Henrici Wegelin: Holmiae, Samson and Wallin, p. 161.Google Scholar
Ling, M.X., Zhan, R.B., Wang, G.X., Wang, Y., Amelin, Y., Tang, P., Liu, J.B., Jin, J., Huang, B., Wu, R.C., Xue, S., Fu, B., Bennett, V.C., Wei, X., Luan, X.C., Finnegan, S., Harper, D.A.T., and Rong, J.Y., 2019, An extremely brief end Ordovician mass extinction linked to abrupt onset of glaciation: Solid Earth Sciences, v. 4, p. 190198.CrossRefGoogle Scholar
Liu, D.Y., Xu, H.K. and Liang, W.P., 1983, Brachiopoda, in Nanjing Institute of Geology and Mineral Resources, ed., Palaeontological Atlas of East China (1), Early Palaeozoic Volume: Beijing, Geological Publishing House, 657 p. [in Chinese]Google Scholar
Marr, J.E., and Nicholson, H.A., 1888, The Stockdale Shales: Quarterly Journal of the Geological Society, v. 44, p. 654732.CrossRefGoogle Scholar
McEwan, E.D., 1939, Convexity of articulate brachiopods as an aid in identification: Journal of Paleontology, p. 617620.Google Scholar
Nikiforova, O., and Andreeva, O., 1961, Stratigraphy of the Ordovician and Silurian of the Siberian platform and its palaeontological basis (Brachiopods): Biostratigrafiya Sibirskov Platformy, Leningrad, v. 1, p. 1412. [in Russian]Google Scholar
Nikiforova, O., and Modzalevskaya, T.L., 1968, Some Llandovery and Wenlock brachiopods of North Eastern Siberian Platform: Uchenye zapiski NIIGA, Paleontologiya i stratigrafiya, v. 21, p. 5081. [in Russian]Google Scholar
Nikiforova, O.I., Oradovskaya, M.M., and Popov, L.E., 1982, New Ordovician atrypides (Brachiopoda) from the north-east of USSR, Taimyr and Kazakhstan: Paleontologicheskii Zhurnal, v. 1982, no. 3, p. 6269. [in Russian]Google Scholar
Nikitin, I.F., Popov, L.E., and Bassett, M.G., 2006, Late Ordovician rhynchonelliformean brachiopods of north-eastern Central Kazakhstan: National Museum of Wales, Geological Series, v. 25, p. 223294.Google Scholar
Nikitina, O., Nikitin, I., Olenicheva, M., and Palets, L., 2015, Lower Silurian stratigraphy and brachiopods of the Chingiz range, eastern Kazakhstan: Stratigraphy and Geological Correlation, v. 23, p. 262280.CrossRefGoogle Scholar
Popov, L.E., Nikitin, I.F., and Sokiran, E.V., 1999, The earliest atrypides and athyridides (Brachiopoda) from the Ordovician of Kazakhstan: Palaeontology, v. 42, p. 625661.CrossRefGoogle Scholar
Raup, D.M., and Sepkoski, J.J., 1982, Mass extinctions in the marine fossil record: Science, v. 215, p. 15011503.CrossRefGoogle ScholarPubMed
Reed, F.C., 1952, Revision of certain Ordovician fossils from County Tyrone: Proceedings of the Royal Irish Academy. Section B: Biological, Geological, and Chemical Science: v. 55, p. 29136.Google Scholar
Rubel, M., 1970, Silurian Brachiopods Pentamerida and Spiriferida of Estonia: Eesti Teaduste Akademi, Geologi Institut, Tallinn, v. 40, p. 175. [in Russian]Google Scholar
Rukavishnikova, T., 1956, Ordovician brachiopods from Kazakhstan: Trudy Akademiia Nauk SSSR, Geologicheskii Institut, Moscow, v. 1, p. 105168. [in Russian]Google Scholar
Rzhonsnitskaia, M.A., 1974, Brachiopods, in Biske, Y.S., Goryanov, V.B., .Petrosyan, N.M., and Rzhonsnitskaia, M.A., eds., Some Materials on the Fauna and Flora of the Djidala Formation (Middle Paleozoic Altai Range): Voprosy Stratigrafii, v. 1, p. 5462. [in Russian]Google Scholar
Schuchert, C., and Cooper, G.A., 1930, Upper Ordovician and Lower Devonian stratigraphy and paleontology of Perce, Quebec: American Journal of Science, ser. 5, v. 20, p. 161176.CrossRefGoogle Scholar
Scott, R., and Kneller, B., 1990, A report on the Ashgill and Llandovery age rocks of Sheet 38 (Ambleside): British Geological Survey Onshore Geology Series, Technical Report WA/90/63, 35 p.Google Scholar
Sennikov, N.V., Obut, O.T., and Izokh, N.G., 2015, New data on the stratigraphic division of the Ordovician of Tuva: Interexpo Geo-Siberia, v. 2, 178182. [in Russian]Google Scholar
Sheehan, P.M., 1987, Late Ordovician (Ashgillian) brachiopods from the region of the Sambre and Meuse rivers, Belgium: Bulletin-Institut Royal des Sciences naturelles de Belgique, Sciences de la terre, v. 57, p. 581.Google Scholar
Sheehan, P.M., and Lespérance, P.J., 1979, Late Ordovician (Ashgillian) brachiopods from the Percé region of Quebec: Journal of Paleontology, v. 53, p. 950967.Google Scholar
Sowerby, J. de C., 1839, Organic remains, in Murchison, R.I., The Silurian System, founded on geological researches in the counties of Salop, Hereford, Radnor, Montgomery, Caermarthen, Brecon, Pembroke, Monmouth, Gloucester, Worcester, and Stafford: with descriptions of the coalfields and overlying formations: London, J. Murray, p. 579765.Google Scholar
Štorch, P., and Schoenlaub, H.-P., 2012, Ordovician-Silurian boundary graptolites of the Southern Alps, Austria: Bulletin of Geosciences, v. 87, p. 755768.CrossRefGoogle Scholar
Strahan, A., Cantrill, T.C., Dixon, E.E.L., Thomas, H.H., and Jones, O.T., 1914, The Geology of the South Wales Coalfield. Part 11: The Country Around Haverfordwest: Memoirs of the Geological Survey, 262 p.Google Scholar
Struve, W., 1966, Some Atrypinae from Siluriam and Devonian: Senckenbergiana lethaea, v. 47, p. 123163.Google Scholar
Temple, J.T., 1970, The lower Llandovery brachiopods and trilobites from Ffridd Mathrafal, near Meifod, Montgomeryshire: Monograph of Palaeontographical Society, v. 124, 76 p.Google Scholar
Temple, J.T., 1987, Early Llandovery brachiopods of Wales: Monograph of the Palaeontographical Society, v. 139, 137 p.Google Scholar
Thomsen, E., and Baarli, B.G., 1982, Brachiopods of the lower Llandovery Sælabonn and Solvik formations of the Ringerike, Asker and Oslo districts, in Worsley, D., ed., Proceedings IUGS Subcommission on Silurian Stratigraphy Field Meeting, Oslo Region: Paleontological Contributions from the University of Oslo, v. 278, p. 6378.Google Scholar
Torsvik, T.H., and Rehnström, E.F., 2003, The Tornquist Sea and Baltica-Avalonia docking: Tectonophysics, v. 362, p. 6782.CrossRefGoogle Scholar
Williams, A., 1951, Llandovery brachiopods from Wales with special reference to the Llandovery District: Quarterly Journal of the Geological Society, v. 107, p. 85136.CrossRefGoogle Scholar
Xu, H., 1979, Brachiopoda, in Wang, Y., Jin, S., Ye, H., Xu, H., and Sun, D., eds., Palaeontological Atlas of North-western China. 1, Qinghai: Beijing, Geological Publishing House, v. 1, p. 9798.Google Scholar
Zahn, R-B., and Cocks, L.R.M., 1998, Late Ordovician brachiopods from the South China Plate and their palaeogeographical significance: Special Papers in Palaeontology, no 59, p. 570.Google Scholar