Acta Palaeontologica Polonica

Turonian and Coniacian foraminifera from the Nysa Trough, Sudetes, Poland

Eugenia Gawor-Biedowa

Acta Palaeontologica Polonica 25 (1), 1980: 3-54

Turonian to Coniacian foraminifera from the Nysa Trough, Sudetes, are investigated. Totally, 55 species are recorded; 42 species in the Turonian, 49 species in the Coniacian. Most species are benthic forms. Two new species are described from the Turonian: Dicarinella sudetica sp. n. and Dicarinella radwanskae sp. n. Wall microstructure and alternation of generations are studied in the genus Gavetinella. Six foraminiferal zones are recognized; 4 of them in the Turonian (Dicarinella sudetica Zone, Tappanina eouvigeriniformis Zone, Archaeoglobigerina cretacea Zone, and DicarineHa concavata Zone), and the remaining 2 in the Coniacian (Epistomina spinutifera potypioides Zone and Gaudryina sudetica Zone). Changes in composition of the foraminiferal assemblages were caused by changes in water depth and presence/absence of interconnections between the basin and open sea.

Key words: Foraminifera, Turonian, Coniacian, stratigraphy, Sudetes, Poland.

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