Diogenite Meteorites Asteroid 4 Vesta Specimen NMW 7831 Western Sahara Display Fish Fossilized partial carcasses bearing distinctive Fossilized partial carcasses bearing distinctive feeding marks provide compelling taphonomic evidence of predation and caching behavior—traces attributable exclusively to Archaeotherium within the White River fauna It could have been that competition for the ecological niche of apex predators was so fierce that the only way Prognathodon could evolve and survive was by adapting to a different food source indicating that early forming crystals settled and accumulated within magma chambers as molten material differentiated dense minerals such as orthopyroxene crystallized early and migrated downward