Alcı-Aşağı Yurtçu Bölgesi Geç Kretase Yaşlı İncirli Formasyonu’nun Ostrakod Biyostratigrafisi, Kronostratigrafisi ve Paleoortamsal Yorumu, Güneybatı Ankara
Gizli, Hulde Tuğba
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The study was carried out on the İncirli Formation (Alcı Basin) that crops out along a NE-SW trending direction between Alcı and Aşağı Yurtçu districts, located 40 km southwest of Ankara. The trangressive İncirli Formation starts with red fluvial sequence dominated by poorly sorted, monogenic conglomerate derived from the underlying Late Jurassic-Early Cretaceous limestones. The formation progressively passes to sandstones, and dark gray-blue marls and mudstones are observed in the uppermost part. The ostracoda fauna of the İncirli Formation, that was deposited during the Late Cretaceous period in the Alcı Basin of Ankara, is determined from the 37 samples gathered from the 2 measured stratigraphic sections. During the examinations, 14 different genera and 4 genera that was left open to nomenclature has been determined. While only 11 of the 27 determined taxa of ostracoda were previously defined, the remaining 12 taxa are left open to nomenclature. In consideration of the environmental diffusion of the determined ostracoda genera, its concluded that the İncirli Formation deposited in shallow marine neritic environmental conditions. According to the chronostratigraphic ranges of the determined ostracoda species, the age of the deposition of the İncirli Formation is determined as Santonian-Campanian.