Writers : Hadavi,Fateme;Senmari,Saeide
Refference : Geosciences Scientific Quarterly Journal,No.33_34
Publishing Year : 1380

Abstract :

The studied area is located west of Sarakhs, about 25 km. from Shurlogh village, Koppeh Dagh Mountains, north_east Iran. The formation under consideration is called Khangiran Formation and is composed of marl, limyshale and sandy-limestone.
Due to insufficient laminations and particular lithology, samplings were rendered with much difficulty. However, the mair purpose of this research was to establish biostratigraphic zonations and correlations with other universally accepted standar biozones. This is the first attempt that the named area was investigated systematically for calcareous nannofossils.
Twenty nine samples were collected from Khangirart Formation. Calcareous nannofossils were studied with light and electroni microscopes, after particular processes had been carried out.
Eleven families, twenty one genera and fifty one species of calcareous nannofossils were investigated.
Nine biozones were determined based on the first occurrence and fossil assemblage in Khangiran Formation, These assemblages from base to top are NP13, and up to NP24(Martini, 1971).
The age of late early Eocene to late Oligocene is suggested for Khangiran Formation.

Subject List : Carbonate Nannofossil