Facies and sedimentary environment of cretaceous units at north west of Dihuk – Tabas region(Shotori mountain range)

An investigation was made on the facies and sedimentary environment of upper cretaceous rocks at north west of Shotori mountain range at Dihuk – Tabas region. This study has also covered carving lime sediments mainly being micritic and sparits with fossil(bioclast) markings, such as: Echinoderm, alga, lamelibransch, brachiopodo and berizoa. Field and microscopic studies led to recognition and separation of 10 carbonate and carving facies as follow: Group of open marine facies that include 1- Bioclastic mudstone, 2- Bioclastic wackstone, 3- Bioclastic packstone; Group of barrier facies that include 4- Bioclastic grainstone, 5- Grainstone packstone; Group of lagoon facies that include 6- Bioclastic packstone, 7- Peloid wackstone; Group of continental facies that include 8- Litharenite, 9- Sub-litharenite and 10- Gerywacki. By interpretation and analysis of these microfacies and their related environment we shall be able to recognize the old geographical(palaeobiogeographic) condition in this region which has proven to have been a ramp type carbonate platform with a nearly uniform slope(homodinal ramp).

Sedimentology, Mount Shotori, Dihuk - Tabas, Lithology, Facies, Sedimentary environment.