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An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia.
Swedish Museum of Natural History, Department of Paleobiology.
Swedish Museum of Natural History, Department of Paleobiology.
Université de Lille.
California State University, Fullerton, CA.
2015 (English)In: Acta Palaeontologica Polonica, ISSN 0567-7920, E-ISSN 1732-2421, Vol. 60, no 2, 421-512 p.Article in journal (Refereed) Published
Abstract [en]

An assemblage of mineralised skeletal fossils containing molluscs, hyoliths, halkieriids, chancelloriids, tommotiids, lobopodians, paleoscolecids, bradoriids, echinoderms, anabaritids, hyolithelminths, hexactinnelid, and heteractinid sponges is described from the early Cambrian Emyaksin Formation exposed along the Malaya Kuonamka and Bol’shaya Kuonamka rivers, eastern flanks of the Anabar Uplift, northern Siberian Platform. The sampled succession is attributed to the Tommotian–Botoman Stages of Siberia and correlated with Stage 2 of Series 1–Stage 4 of Series 2 of the IUGS chronostratigraphical scheme for the Cambrian. Carbon isotope chemostratigraphy is applied herein for regional correlation. The fauna contains the earliest Siberian and probably global first appearances of lobopodians, paleoscolecids, and echinoderms, and includes elements in common with coeval faunas from Gondwana, Laurentia, and Baltica. For the first time from Siberia, the latest occurrence of anabaritids is documented herein from the Atdabanian Stage. Problematic calcium phosphatic sclerites of Fengzuella zhejiangensis have not been previously known from outside China. The sellate sclerites, Camenella garbowskae and mitral sclerites, C. kozlowskii are unified within one species, C. garbowskae. In addition to more common slender sclerites, Rhombocorniculum insolutum include broad calcium phosphatic sclerites. A number of fossils described herein demonstrate excellent preservation of fine details of skeletal microstructures. Based on new microstructural data, sclerites of Rhombocorniculum are interpreted as chaetae of the type occurring in annelids. A new mollusc Enigmaconus? pyramidalis Kouchinsky and Vendrasco sp. nov. and a hyolith Triplicatella papilio Kouchinsky sp. nov. are described.

Place, publisher, year, edition, pages
2015. Vol. 60, no 2, 421-512 p.
Keyword [en]
Skeletal fossils, Echinodermata, stratigraphy, Cambrian, Siberia
National Category
Geology Evolutionary Biology Geosciences, Multidisciplinary
Research subject
Diversity of life
URN: urn:nbn:se:nrm:diva-1495DOI: 10.4202/app.2012.0004OAI: diva2:876709
Swedish Research Council, 2004-5218, 2007-4484, 2010-3929Danish National Research Foundation, DNRF53
Available from: 2015-12-04 Created: 2015-12-04 Last updated: 2015-12-07Bibliographically approved

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Kouchinsky, ArtemBengtson, Stefan
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