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The global climate change in the early Eocene contributed significantly to the turnover of benthic foraminifera. A major extinction within agglutinated and calcareous forms and the occurrence of opportunistic assemblages resulted. The  Trochammina  material described here belongs to these post-crisis assemblages. Foraminiferal assemblages with numerous  Trochammina  species are identified within deep-water Eocene deposits of the Polish part of the Outer Carpathians.  Trochammina  reach up to 80% of the assemblages, the remainder consists of cosmopolitan agglutinated foraminifera, mainly  Bathysiphon, Recurvoides, Paratrochamminoides  and  Trochamminoides . The low biodiversity (average number of species 24, of genera 15) and the presence of dwarf forms are the main characteristics of the assemblages. These assemblages occur predominantly in shales with numerous organic traces (lower Hieroglyphic beds), deposited in the Silesian Basin (Outer Carpathians) which was on the northern margin of the western Tethys Ocean during the early Eocene (Ypresian,  c . 50 Ma). The  Trochammina  biofacies developed in the Silesian Basin after the Paleocene–Eocene Thermal Maximum crisis, and is dominated by opportunistic forms, mainly represented by mobile epifauna and shallow-water infauna, interpreted as a recolonizing assemblage in a low energy environment.

journal of micropalaeontology

Small-sized &amp;lt;i&amp;gt;Trochammina&amp;lt;/i&amp;gt; assemblages in deep-water Eocene flysch deposits (Outer Carpathians, Poland) and their palaeoecological implications