An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia

被引:87
作者
Kouchinsky, Artem [1 ,2 ]
Bengtson, Stefan [1 ,2 ]
Clausen, Sebastien [3 ]
Vendrasco, Michael J. [4 ]
机构
[1] Swedish Museum Nat Hist, Dept Palaeozool, SE-10405 Stockholm, Sweden
[2] Swedish Museum Nat Hist, Nord Ctr Earth Evolut NordCEE, SE-10405 Stockholm, Sweden
[3] Univ Lille 1, CNRS, UMR8157 7207, F-59655 Villeneuve Dascq, France
[4] Calif State Univ Fullerton, Dept Biol Sci MH 282, Fullerton, CA 92834 USA
基金
瑞典研究理事会; 新加坡国家研究基金会;
关键词
Skeletal fossils; Echinodermata; stratigraphy; Cambrian; Siberia; SMALL SHELLY FOSSILS; YOCHELCIONELLA MOLLUSCA; TACONIC-ALLOCHTHON; PELMATOZOAN ARMS; BIVALVE POJETAIA; SOUTHERN SHAANXI; SPONGE SPICULES; EARLY EVOLUTION; MIDDLE; MICROFOSSILS;
D O I
10.4202/app.2012.0004
中图分类号
Q91 [古生物学];
学科分类号
0709 ; 070903 ;
摘要
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.
引用
收藏
页码:421 / 512
页数:92
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