Iraqi National Journal of Earth Science

Abstract

The main purpose of the present work is to describe the microfossils and biostratigraphy of marine Eocene deposits, which described and studied in detail from carbonates of the Naopurdan Group, Chwarta area, Kurdistan Region, Northeastern Iraq, in order to define the main important index fossils and to give the biostratigraphy and age determination of the study area. A total of thirty-eight samples spaced ca 0.5 to 1 m apart, have been collected from the field, approximately 60 thin sections were examined and the microfossils have been identified by using polarized microscopes. Three main biozones were recorded in the studied section, these zones are: (Nummulites globulus - Nummulites planulatus zone, at the bottom of the section and assigned to the Early Eocene (Ypressian) age, Nummulites mamillatus - Nummulites alsharhani zone, which collected from the middle part of the section is assigned to the Middle Eocene (Lutetian) age and Nummulites fabianii - Assilina exponens zone which collected from the upper part of the section is assigned to the Early Bartonian age, so the studied section of the Naopurdan Group suggest to be Ypressian - Early Bartonian age, these three biozones were correlated with the other zones inside and outside Iraq