Mainly pe lagic/hemipelagic de pos its of the Vezhany Nappe (Paleocene-low er most Oligocene Metova For ma tion with a high con tent of plank tonic foraminifera) and typ i cal flysch de pos its of the Monastyrets Nappe (Paleocene-Eocene Sushmanets For ma tion with com mon ag glu ti nated foraminifera as well as the Eocene Drahovo For ma tion), of the south west ern in ner part of the Ukrai nian Carpathians have been stud ied. The Parvularugoglobigerina eugubina Zone (Lower Danian), Acarinina acarinata Zone (Up per Thanetian), Morozovella subbotinae Zone and Morozovella aragonensis Zone (Ypresian), Acarinina bullbrooki Zone and Acarinina rotundimarginata Zone (Lutetian), Subbotina corpulenta Zone and Subbotina vialovi Zone (Up per Priabonian-Lower Rupelian) based on plank tonic foraminifera as well as the Rzehakina fissistomata sensu lato Zone (Paleocene), Glomospira charoides-Recurvoides smugarensis Zone (Ypresian), and an as sem blage with Haplophragmoides parvulus (lat est Mid dle Eocene-early Late Eocene) based on ag glu ti nated foraminifera have been iden ti fied in these de pos its. The deep-wa ter ag glu ti nated foraminifera of the "Rzehakina", "Rhabdammina" and "Paratro chamminoides" assem blages found in the typ i cal flysch de pos its of the Sushmanets For ma tion in di cate lower slope to abys sal en vi ron ments be low the CCD. The ge neric com po si tion and mor pho log i cal fea tures of plank tonic and ben thic foraminifera re cov ered from marls of the Metova For ma tion sug gest pe lagic/hemipelagic con di tions at bathyal depths above the foraminiferal lysocline.

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For the first time in the Ukrainian Carpathians, the depths and tectono-sedimentation processes in the north-eastern part of the Outer Carpathian Basin (Skyba and Boryslav-Pokuttya units) have been restored on the base of sedimentological and microfaunistic studies. It was established that in the Cretaceous-Eocene time, the deep-water (near Calcite Compensation Depth) turbidite and similar sedimentation (turbidites with Bouma textures, grainites, debris-flow deposits), which periodically alternated with (hemi)pelagic sedimentation (red, green and black shales) was dominant here. Sedimentation took place on the continental margin of the the Carpathian branch of the Tethys, where deep-water fans were formed. Cretaceous-Eocene background red and green shales are enriched in buried in situ benthic foraminifera which are similar in taxonomic composition and morphological features to the microfauna of the Carpathian-Alpine and Atlantic regions (deep-water agglutinated foraminifera), which indicate lower bathyal – abyssal depths of flysch sedimentation. Latest Eocene Globigerina Marl horizon contains the foraminiferal assemblage with plankton dominance, which indicates a general shallowing of the Outer Carpathian Basin (middle-upper bathyal conditions above a calcite compensation depth). Oligocene – lowermost Miocene Menilite-Krosno and Polyanytsia formations were accumulated in the Skyba and Boryslav-Pokuttya sub-basins. In the Miocene, shallow-water molasses were accumulated here. Probably, the tectonic uproot of flysch deposits from its substrate and their synsedymentary thrusting towards the platform caused a significant shallowing of the Skyba and Boryslav-Pokuttya sub-basins starting from the latest Eocene. These processes reflected the growth of the Carpathian frontal nappes at the final orogen formation stage.

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