Sandstone

Russia, Caucasus, Stavropol Territory, Kislovodsk. Yellowish-gray fine-grained massive glauconite-quartz sandstones. Contains cohesions of calcareous sandstones and rare nest-clad leafy mudstones. Shagirtskaya series. Thickness - 25 meters. Fossil: Dufrenoya furcata Kaz., Cheloniceras seminodosum Sing., Deshayesites deshyi Papp., Panope gurgitis Bron., P. akuschaensis Mordv., Thetironia minor Sow., Dosinimeria para Sow., Deshayesites weissi Neut. et Uhl., Cheloniceras seminodosum Sing., Barbatia apptiensis Pict. et Camp., Colombiceras tobleri Jac. et Tobl., C. subtobleri Kas., Epicheloniceras tschernyschewi Sinz., Acanthohoplites nolani Seun., A. lorioli Sinz., Hypacanthoplites tscharlokensis Glas., H. jacobi Coll., Aucellina gryphaeoides Sow., Leymeriella tardefurcata Leum., L. bogdanovitschi Glasun., L. andrussovi Natzky., Parahoplites melchioris Anth., Linotrigonia spinosa Park., Acanthohoplites abichi Anth., A. bigoureti Seun. Lower Cretaceous. Aptian.