Early Cretaceous trigoniids of the Northern Caucasus

Resumo

This paper includes descriptions of 29 species (including four new species) of trigoniids (Bivalvia, Trigoniidae) from the Lower Cretaceous of the Northern Caucasus. The paper discusses the history of their study, revises all species known in the region, and reviews the stratigraphy of the Berriasian, Valanginian, Hauterivian, Barremian, and Aptian of the region. The three characteristic assemblages recognized contain species important for the Lower Cretaceous stratigraphy of the Northern Caucasus.