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Alvarez hypothesis American Museum Andrews animals appeared Archaeopteryx archosaurs asteroid Bakker birds boundary brontosaurs Buckland carnivores catastrophe Clemens coelurosaurs comets companion star Compsognathus Cope creatures Cretaceous-Tertiary crocodiles Cuvier Darwin Deinonychus digging dino dinosaur bones dinosaurian dinosauroid Diplodocus discovered discovery Douglass earth ectotherms eggs endotherms evidence evolution evolutionary evolved expedition exploration feathers fossil hunters fossil record geologic geologists Georges Cuvier gradualists hadrosaurs Hatcher Hell Creek Horner human Hutton Huxley Iguanodon impact iridium Jensen John Ostrom Jurassic known land late Cretaceous layer living lizard looked Luis Alvarez mammals Mantell marine Marsh mass extinctions Mesozoic meters million years ago Montana Muller Natural History nest orbit Ostrom Owen paleontologists plants probably pterosaurs quarries Raup reptiles reptilian rock sandstone saurs scientific scientists sediments seemed Sepkoski skeleton skull species specimens Sternberg survived teeth theory therapsids tion Triassic University vertebrate Walter Alvarez warm-blooded wrote