Яндекс.Метрика

Е.М.Тесакова, Л.А. Глинских,А.Г.Федяевский,А.А.Мироненко,А.П.Ипполитов

Издание: Юрская система России: проблемы стратиграфии и палеогеографии: Материалы VIII Всероссийского совещания с международным участием. Онлайн-конференция (7-10 сентября 2020 г., г. Сыктывкар)
Издатель: ИГ Коми НЦ УрО РАН , Место издания: Сыктывкар , Год издания: 2020
Страницы: 222-230

Аннотация

Foraminifers, ostracods, and palynomorphs were studied from the Lower Callovian Subpatruus ammonite Zone, sampled in a single locality in the southern part of Nizhny Novgorod region. The foraminiferal complex is characteristic for the Haplophragmoides infracalloviensis - Guttulina tatarensis Zone. By ostracods, it is possible to distinguish P. cinicinnusa - P. octoporalis Beds in the lower part of the section (newly described unit) and A. milanovskyi - P. cinicinnusa Zone in its upper part (unit, previously known in Povolzhye). The former unit correlates with the surensis ammonite biohorizon, while the latter - with subpatruus, uzhovkensis, and saratovensis biohorizons. The palynospectra correspond to the Fromea tornatilis dinocyst Zone. Palynofacies analysis indicated muddy (distal) shelf environments with normal salinity and oxygen regime, also showing no significant stratification of water column. Comparison of the plots showing diversity and abundance of foraminifera vs ostracods allowed to suggest two T-R cycles.
индекс в базе ИАЦ: 039867