Document Type : Original Research Paper


1 Ph. D. Student, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

2 Professor, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran


Siliciclastic succession of Pesteliegh Formation, Lower Paleocene, has an extensive exposure in the Kopet Dagh basin. Three stratigraphic sections, consist of Dareh Gaz, Shamsikhan and Karnaveh in central Kopet Dagh, were measured and studied for environmental  interpretation and sequence stratigraphic analysis. This study led to identification of 8 lithofacies (Gcm, Gmg, Gt, Sm, Sh, Sp, St و Fm) and 5 architectural elements ( OF, CH, SB,GB,SG). Based on this data, siliciclastic sediments of Pesteliegh Formation were deposited in both fine-grain meandering  and braided river systems. Sequence stratigraphy analysis show that siliciclastic sediments of  the Pesteliegh Formation deposits is composed of two depositional sequences that were effected by tectonic and base level changes during the sea level fall. Both depositional sequences consist of LE and TE phases. Paleogeographic reconsruction of the Early  Paleocene time show  that these deposits were formed during 4 different stages in relation to changes in  accommodation space.


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