The Porphyrit-Hornstein Formation is a geologic formation in Montenegro. It preserves bivalve fossils dating back to the Ladinian of the Triassic period. Fossil content The following fossils were reported from the formation: Bivalves Ostreida Halobiidae Daonella (Arzelella) indica Daonella (Pichlerella) pichleri See also List of fossiliferous stratigraphic units in Montenegro References Bibliography Geologic formations of Montenegro Triassic System of Europe Ladinian Stage Deep marine deposits Paleontology in Montenegro