Kreide-Fossilien in Sachsen, Teil 1. Cretaceous fossils of Saxony, part 1. – 5. Muscheln. 5. Bivalves

This article treats 105 bivalve taxa from the Upper Cretaceous Elbtal Group in Saxony. Predominantly based on original material to the publications of Geinitz (1839 – 1875), determinations and systematic arrangement are partly revised. The majority of the species is documented in photographs for the first time. Almost 50 species names introduced by Geinitz are evaluated. Many of these names have already been recognised as synonyms of earlier names by Geinitz himself and other scholars, or are identified as such herein. Seven of Geinitz’ species names are considered as nomina dubia (doubtful names). Currently, 15 of the bivalve taxa described as new by Geinitz are conserved, some of them with unsettled generic attribution. The individual species are very unequally distributed among the different formations of the Elbtal Group. The bivalve fauna of the rocky shore and Pläner facies of the Dölzschen Formation (upper Upper Cenomanian) is richest both with regard to species and individuals. Generally poor in bivalve species are the greensands and sandy-glauconitic marly clays of the lower Upper Cenomanian Mobschatz Formation, the conglomerates of the Meißen Formation (upper Lower Cenomanian), as well as the coarse-grained sandstones of the Oybin Formation in the Zittau Mountains (Turonian).