Яндекс.Метрика

I. Korovnikov, N. Sennikov, T. Danelian, O. Obut, L. Pouille

Issue: 1 , Volume: 99 , Уear of publication: 2013
Serial edition: Annales de Paleontologie
Pages: 79-89

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
индекс в базе ИАЦ: 039533