Writers : Hadavi,Fateme؛ Sanlari,Saideh
Refference : Geosciences Scientific Quarterly Journal,No.:33-34,P.:78
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, limy shale and sandy-limestone.
Due to insufficient laminations and particular litho logy, samplings were rendered with much difficulty. However, the main purpose of this research was to establish biostratigraphic zonations and correlations with other universally accepted standard biozones. This is the first attempt that the named area was investigated systematically for calcareous nannofossils.
Twenty nine samples were collected from Khangiran Formation. Calcareous nannofossils were studied with light and electronic 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.
Key Words: Nannoplanktons, Khangiran Formation, Chehel Kaman, Koppeh Dagh, Iran

Subject List : Nanoplankton