2008/11/18 by А. Э. Конторович, А.И. Варламов, Dmitriy Grazhdankin +12 · 1 citation
Earth and Planetary Sciences · #Paleontology and Stratigraphy of Fossils #Geological Studies and Exploration #Geological and Geochemical Analysis
paper · doi:10.1016/j.rgg.2008.06.012
openalex publication_date 2008/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Abstract The Borehole Vostok 3 drilled in the east of the West Siberian Plate (Tomsk Region) revealed a Vendian section in the depth range 5002–3870 m, which was subdivided into the Poiga, Kotodzha, and Raiga Formations based on geological, geophysical, and paleontological data. In the Kotodzha and Raiga Formations, typical Upper Vendian fossils of Cloudina hartmanae and Namacalathus sp. were found along with diverse Platysolenites, which are commonly considered to be of zonal significance in Lower Cambrian strata. Hence, the stratigraphic interval with abundant diverse Platysolenites has a wider stratigraphic range than it was believed earlier and seems to cover the Upper Vendian and Lower Cambrian deposits. The Borehole Vostok 3 is the first Siberian occurrence of the fossils Namacalathus, the world’s fourth occurrence of the Cloudina-Namacalathus association, and the first site where coexisting Platysolenites and typical Vendian organisms have been found. Therefore, the borehole provides one of the most informative (in paleontological context) Upper Vendian sections.