Open AccessTHE LOWER CRETACEOUS TIRGAN FORMATION IN THE GELIAN SECTION (KOPET DAGH, NORTH IRAN): MICROFACIES, MICROFOSSILS, AND THEIR BIOSTRATIGRAPHIC SIGNIFICANCE
Author(s) -
Ioan I. Bucur,
Hamed Yarahmadzahi,
Cristian Victor Mircescu
Publication year - 2019
Publication title -
acta palaeontologica romaniae
Language(s) - English
Resource type - Journals
eISSN - 2248-3802
pISSN - 1842-371X
DOI - 10.35463/j.apr.2019.01.02
Subject(s) - aptian , cretaceous , geology , foraminifera , paleontology , carbonate , ecological succession , section (typography) , stratigraphic section , assemblage (archaeology) , carbonate platform , calcareous , structural basin , oceanography , sedimentary depositional environment , chemistry , ecology , organic chemistry , advertising , business , biology , benthic zone
The carbonate succession of the Tirgan Formation was studied in the Gelian section located 25 km south of Shirvan town (central Kopet Dagh). In this section, the Tirgan Formation contains a rich assemblage of calcareous algae and foraminifera. Based mainly on the orbitolinid association a latest Barremian-ealy Aptian age was assigned to the Tirgan Formation in the Gelian section. Based on the available stratigraphic analyses and age assignments of the overlying Sarcheshmeh Formation by different authors, one should presume that both the Tirgan and the Sarchesh-meh formations are heterochronous across the Kopet Dagh basin.