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Fossils of the bivalve Conchodus infraliasicus in the Dachstein Formation as seen in the “Klamm.” The larger shells are about 10 cm long. Note that many of the shells are closed, indicating rapid burial while alive.
Dinosaurs are not the only group of organisms to disappear above Cretaceous strata. Inoceramids, a family of large bivalves, are also extinct and not found in Cenozoic layers. Remains of fish have been found preserved within some specimens of this giant clam, leading to the suggestion of possible commensalism or symbiosis. Specimen on display at the Colorado Museum of Nature and Science.