Upper lower Cambrian (provisional Cambrian Series 2) trilobites from northwestern Gansu Province, China

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Abstract

Upper lower Cambrian (provisional Cambrian Series 2) trilobites are described from three sections through the Shuangyingshan Formation in the Beishan area, northwestern Gansu Province, China. The trilobite fauna is dominated by eodiscoid and 'corynexochid' trilobites, together representing at least ten genera: Serrodiscus, Tannudiscus, Calodiscus, Pagetides, Kootenia, Edelsteinaspis, Ptarmiganoides?, Politinella, Dinesus and Subeia. Eleven species are described, of which seven are identified with previously described taxa and four described under open nomenclature. The composition of the fauna suggests biogeographic affinity with Siberian rather than Gondwanan trilobite faunas, and the Cambrian Series 2 faunas described herein and from elsewhere in northwestern China seem to be indicative of the marginal areas of the Siberian palaeocontinent. This suggests that the Middle Tianshan-Beishan Terrane may have been located fairly close to Siberia during middle-late Cambrian Epoch 2.

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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Geology

Keywords

  • Trilobita, taxonomy, palaeobiogeography, lower Cambrian, Cambrian Series, 2, Beishan, Gansu Province, China
Original languageEnglish
Pages (from-to)123-143
JournalEstonian Journal of Earth Sciences
Volume63
Issue number3
Publication statusPublished - 2014
Publication categoryResearch
Peer-reviewedYes