Middle Jurassic fossils from Daghestan. A revision of ammonites and bivalves collected by the Déchy Caucasus expeditions (1884–1902)

M. DÉCHY, the Hungarian traveller organised several mountaineering trips to the Caucasus in the years 1884 to 1902, when geologist members of the parties collected rock and fossil samples. These were described by K. PAPP, later professor of the Department of Paleontology of the University of Budapest. The specimens went finally to the collections of the Hungarian Natural History Museum. A revision of the better-localized Bajocian and Callovian specimens, mostly from around the Daghestanian town Gunib are revised. Two ammonites: Stephanoceras liechtensteinii and Prorsisphinctes loczyi described as new by PAPP, and several other ammonites and bivalves are now re-described and illustrated with proper photographs. The positions of the fossils within the sequences are poorly known, thus the material has historical rather than stratigraphic value