THE BIVALVIA AND GASTROPODA FAUNA OF THE AMMONITICO ROSSO FACIES OF LATE SINEMURIAN-EARLY PLIENSBACHIAN OF THE KÖSRELİK REGION (NE ANKARA-TURKEY); FIRST RECORD OF ANNELID POLYCHAETE SPECIES AND THEIR PALEOGEOGRAPHIC AND PALEOECOLOGIC CHARACTERISTICS

Abstract

The nodular limestones of the Ammonitico Rosso facies of the Ankara region of the Central Anatolia, deposited during the Early-Middle Jurassic and show similar paleontological and sedimentological characteristics to those of the red nodular limestones of the northern and southern Alps. In particular, bivalves, gastropods, annelid, crinoid, brachiopod, belemnit and other cephalopods were sampled from the Ammonitico rosso facies sediments cropping out in the northwest of the Baðlum village in the north of Ankara. The following species have been described; four bivalv taxa (Parainoceramus bileciki Conti and Monari 1991, Parainoceramus nicosiai Conti and Monari 1991, Mytilioides sp. and Palaeonucula sp), three species of gastropods (Pleurotomaria suessii Hörnes 1853, Pleurotomaria sp. and Eucyclus (Eucyclus) sp.) and annelid polycahete Glomerula gordialis (Schlotheim 1820). They have been identified for the first time in the Early Jurassic sequences of Turkey and their paleogeographic characteristics are discussed.