Türkiye Jeoloji Bülteni

Sedimentological Studies of the Continental Formations Around the Region of Çankın-Çorum Basin

Abstract: A succession of marine and continental rocks which ranges in age from. Lower Eocene to Pliocene has beenwell preserved in the Sungurlu (Çorum) region of central Turkey. The Sungurlu Group consists of two marine formations.The Cevherli Formation is a turbidite sequence which has been deposited by southward prograding submarine fan.There are also olistoliths and olistostromes which are closely associated with turbidites. The Kepir Tepe Formation iscomposed of limestone, marl and lenses of conglomerate and sandstone. This formation has been deposited in a shallowwater environment.Since Late Middle Eocene time, continental sediments have been deposited in the area. The Büyükpolatlı Formation (UpperEocene-Miocene) consists of red coloured conglomerate, sandstone and mudstone. These sediments have been deposited in afluvial environment dominated by meandering rivers. The direction of sediment transportation was from northeast to southwest.The Terzili Formation is composed of alternations of gypsum, mudstone and fine-grained sandstone which have been deposited inan interior playa (continental sabkha) environment. The Büyükşeyhefendi Tepe Formation (Pontian) is composed of poorlybedded, poorly sorted conglomerate, sandstone and mudstone which appear to have been originated in an alluvial fanenvironment on the foot of the high mountain range.