 The Pisco Formation of Peru is known for its wide assemblage of marine vertebrates.Several whales are known, most commonly the mid-sized cetotheriid baleen whales; other whales found are the rorqual baleen whale "Balaenoptera siberi", the beaked whale "Messapicetus gregarius", the pontoporiid dolphin "Brachydelphis mazeasi", some oceanic dolphins, the tusked dolphin "Odobenocetops", and the macroraptorial sperm whales "Acrophyseter" and "Livyatan".Other vertebrates include the seals "Acrophoca" and "Hadrokirus", sea turtles such as "Pacifichelys urbinai", the crocodile "Piscogavialis", cormorants, petrels, and boobies ("Sula" spp.