publication . Article . 2018

The Borschovo section of the Gauja and Amata regional stages (Leningrad Region, Russia): sedimentology and biostratigraphy

Ervīns Lukševičs; Ģirts Stinkulis; Alexander Ivanov; Daiga Tirzmale;
Open Access English
  • Published: 01 Jan 2018 Journal: Estonian Journal of Earth Sciences (issn: 1736-4728, eissn: 1736-7557, Copyright policy)
  • Publisher: Estonian Academy Publishers
Abstract
The results of the detailed sedimentological study and bed-by-bed collecting of fossils from the Borschovo section exposing the upper Givetian–lower Frasnian boundary beds are discussed. The succession consists of sandstones alternating with argillaceous and clayey packages that contain vertebrate and plant remains in the upper part. The grain size, sedimentary structures and cross-bed orientation considerably differ in the Oredezh Beds and the Staritsa Beds. Fine- to coarse-grained cross-stratified sandstones of the Oredezh Beds most probably are fluvial deposits, whereas the sandstones of the Staritsa Beds yielding tidal structures that show variable direction...
Subjects
free text keywords: Middle–Upper Devonian, siliciclastic deposits, sedimentary environment, vertebrate assemblage., Geology, QE1-996.5
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