The biostratigraphic and palaeoenvironmental significance of Lower Cambrian (Botomian) trilobites from the Ak-Kaya section of the Altai Mountains (southern Siberia,Russia) |
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| Authors: | Igor Korovnikov Nikolay Sennikov Taniel Danelian Olga Obut Lauren Pouille |
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| Affiliation: | 1. Institute of Petroleum Geology, Siberian Branch of the RAS, Acad. Koptyug pr. 3, 630090 Novosibirsk, Russia;2. University Lille 1, Department of Earth Sciences, CNRS-UMR 8217 “Géosystèmes”, SN5, 59655 Villeneuve-d’Ascq, France |
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| Abstract: | The presence of one of the oldest records of polycystine Radiolaria in the Lower Cambrian sedimentary sequence of the Ak-Kaya section (Gorny Altai) requires a biostratigraphic dating. The trilobites found recently a few tens of meters below the radiolarian-bearing level belong to Calodiscus resimus Repina, Serrodiscus fossuliferus Repina and Alacephalus aff. contortus Repina; they suggest that this part of the Shashkunar Formation can be correlated with the lower part of the Botomian stage. The absence of eyes in the two former species suggests a mode of life buried in the fine pelagic sediments. Indications of the presence of a strongly developed musculature on the third species point to a palaeoenvironment characterized by a relatively high hydrodynamic regime. |
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| Keywords: | Trilobites Radiolaria Botomian Cambrian Gorny Altai Siberia Russia |
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