Biostratigraphy of planktonic foraminifera in the Abtalkh Formation and determination of the Santonian/Campanian Boundary in the Kopeh-Dagh Sedimentary Basin

Autor:	Mohammad Vahidinia, Meysam Shafieeardestani, Mohamed Youssef
Rok vydání:	2021
Předmět:	Foraminifera Paleontology geography geography.geographical_feature_category biology Boundary (topology) Biostratigraphy Sedimentary basin Plankton biology.organism_classification Geology
Zdroj:	Stratigraphy. :71-87
ISSN:	2331-656X 1547-139X
Popis:	We studied the Abtalkh Formation from five outcrops (Sheikh, Hajgelichkhan, Qarehso, Muzduran, and Deraz-Ab) in the Kopeh-Dagh sedimentary basin. A total of 30 species of planktonic foraminifera belonging to 21 genera were recorded. These species were used to subdivide the Abtalkh Formation into seven biozones (Dicarinella asymetrica Zone, Globotruncanita elevata Zone, Contusotruncana plummerae Zone, Radotruncana calcarata Zone, Globotruncanella havanensis Zone, Globotruncana aegyptiaca Zone, and Gansserina gansseri Zone). The Abtalkh Formation was deposited during the late Santonian-latest Campanian and the Santonian-Campanian boundary is identified based on the last occurrence of Dicarinella asymetrica. The base of the Campanian stage was delineated by the extinction of the marginotruncanid group, the first occurrences of Pseudotextularia nuttalli and Rugoglobigerina rugosa, and on the last occurrence of Dicarinella asymetrica.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::edfbd733dde3dd76f532640b862247b5 https://doi.org/10.29041/strat.18.1.03 Zobrazit plný text záznamu