Trochammina semi-specific assemblages from the Upper Paleocene of the Silesian Nappe, Polish Outer Carpathians

Foraminiferal assemblages rich in Trochammina are described from the uppermost part of the Istebna Beds within the Silesian Nappe (Polish Outer Carpathians). The percentage of Trochammina is 55% and 35% of all foraminifera, making this genus numerous in assemblages. Semi-specific Trochammina assemblages, dominated by the epifaunal eco-group, are represented by dwarf, thin-walled specimens of cosmopolitan taxa, suggesting they developed in a crisis condition. The late Paleocene age of these assemblages is established based on stratigraphic ranges co-occurring agglutinated and planktonic foraminifera, and on superposition of the host rocks.