Sedimentological and Depositional Environment of Upper Cretaceous Sediments “Ain Topi member” NW Libya Gharyan Area

Abstract

Ayn Tobi member represents the upper cretaceous (Cenomian) age. And it is a lower member of the SIDI AS SID Formation, which is followed up gradationally by the Yafrin member, and Nalut Dolomite. The Ayn Tobi member is unconformably underline by Kiklah Formation in the west and the Abu Shaybah Formation in the east. Which is located in western Libya. Jabal Nafusa (Abu Ghaylan area - Gharyan city) 70 km northwest of Tripoli. Where the study focused on field observation and laboratory descriptive sediments of carbonate rocks and samples that were collected and studied in the same time, which consist of limestone and mostly dolomitic limestone, in addition to identifying clear sedimentary structures such as well bedding and lamination , as well as cross bedding . Also determine the sedimentary environments by describing samples.