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Фораминиферы верхнемеловых отложений Сочинского района = The Foraminifera of the Upper Cretaceous deposits in the Sotchi region
Keller, B.M. (1946). Фораминиферы верхнемеловых отложений Сочинского района = The Foraminifera of the Upper Cretaceous deposits in the Sotchi region. Byull. Mosk. Ova. Ispyt. Prir. 51(Geol. 21)(3)(Géol XXI-3): 83-108
In: Bjulleten' Moskovskogo Obscestva Ispytatelej Prirody = Bulletin de la Société des Naturalistes de Moscou. Izdat. Moskovskogo Univ.: Moskva. ISSN 0365-9615
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| Trefwoorden |
Foraminifera
Fossils
Marien/Kust |
| Abstract |
In his paper the author describes the foraminifera of the Upper Cretaceous deposits in the Sotchi region, the stratigraphy of which is reported in B. M. Keller's work. The majority of horizons, consisting of solid dense rocks, show in thin sections the presence of plankton forms (Pithonella, Globotruncana, Pseudotextularia). A more various complex of species has been obtained from the Lower Senonian marls on the river Sotchi (table 2). Two series are distinguished in this locality. The lower series (layers 3, 4), called the Gueniokh horizon, consists of red coloured, sometimes variageted marls and limestones. The upper series (layer 5) is represented by green marls with thin inter layers of soap stones. The complex of species, occuring in the Gueniokh horizon, is distinguished in several regions in the Caucasus. Its age is not established and is assumed hypothetically as the Santonian. The covering green marls are referred to the Campanian deposits. The Gueniokh horizon contains together with typical Upper Cretaceous foraminifera also the species resembling the typical Dani an and Lower Tertiary forms. The latter include Bolivinoides sotchicus n. sp., Globigerinoides korotkovi n. sp., and Globorotalia. The appearance of these species in the Lower Senonian is the evidence that the Lower Tertiary foraminifera have a long history of development. They had arisen already in the Upper Cretaceous epoch, but developed and settled the vast areas only in the Lower Tertiary time, with the coming of new favourable conditions. The systematical part of the work contains the ,description of the new species. |
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