cretaceous period Definition

cretaceous, triassic period, jurassic period, permian period, devonian period, mesozoic era, cambrian period, pleistocene epoch, miocene epoch, eocene epoch, pleistocene, oligocene epoch, pliocene epoch, supercontinent, tertiary period, paleozoic era, cenozoic era, dinosaurs, carboniferous period, laurasia, gondwanaland, faunas, cenozoic, interglacial, upper paleolithic, pliocene, mesozoic, mya, eocene, sauropod dinosaur, triassic, trilobites, archeopteryx, australopithecines, glaciation, paleocene, tyrannosaur, prehistoric, ordovician, iguanodon, megafauna, homo heidelbergensis, horned dinosaur, noachian, placentals, psittacosaurus, conodonts, ichthyosaurs, stegodon, plesiosaurs, fossil, mammoths, columbian mammoth, theropod dinosaur, middle paleolithic, homo erectus, crinoids, precambrian, sauropod, theropod, paranthropus, australopithecus, genus australopithecus, paleogene, hominid, neolithic age, holocene epoch, habilis, hominoid, ostracods, mammuthus, holocene, collared peccary, neogene, mesolithic, paleolithic age, archaeopteryx, australopithecus afarensis, hadrosaur, mosasaur, prehistory, brachiopods, australopithecus africanus, tetrapod, multicellular, hadean, genus homo, carboniferous, dinosauria, fossilized, mastodons, homo sapiens, camarasaurus, eukaryote, baleen whale, phanerozoic, stromatolite, robustus, pterosaur, brachiosaurus,