Related by context. Frequent words. (Click for all words.) 66 Late Cretaceous 61 dinosaurs 58 Cretaceous 58 Pleistocene 56 Pliocene 55 Ordovician 55 prehistory 54 prehistoric 54 Mesozoic 53 megafauna 53 Precambrian 53 Triassic 53 tyrannosaurs 53 mammoths 52 Homo sapiens 51 Jurassic 51 Eocene 51 Neandertals 51 fossils 51 Australopithecus 50 Fertile Crescent 50 mastodons 50 Archaeopteryx 50 glaciation 49 tetrapods 49 sauropod 49 Paleolithic 49 hominid 48 Homo erectus 48 mass extinctions 48 millenniums 48 woolly mammoths 48 mass extinction 48 hunter gatherers 47 vertebrates 47 Devonian 47 ancient Mesopotamia 47 millennia 47 sauropods 47 fossilized remains 47 homo sapiens 47 Neanderthals 47 Paleozoic 46 Ice Age 46 #BC [003] 46 dinosaur 46 taxa 45 mammals 45 Sumerians 45 Tyrannosaurus rex 45 T. rex 45 vertebrate 45 eukaryotes 45 hominids 45 evolutionary 45 epochs 44 plate tectonics 44 arthropods 44 common ancestor 44 palaeontologists 44 Miocene 44 pterosaur 44 Holocene 44 paleo 44 Longrich 44 Mammoths 44 Proterozoic 44 landmasses 44 fossil 44 single celled organisms 44 hunter gatherer 43 baleen whales 43 #BC [002] 43 theropods 43 oceanic 43 Neolithic 43 Bronze Age 43 extinct 43 volcanic islands 43 vertebrate species 43 millenia 43 dinos 43 Medieval Warm Period 43 Little Ice Age 43 prehistoric creatures 43 fossilized 43 pterosaurs 43 landforms 42 flightless birds 42 dinosaur fossil 42 paleontologists 42 lineages 42 archaea 42 woolly mammoth 42 Neanderthal 42 giant tortoises 42 fossilized bones 42 extinctions 42 herbivore 42 Han Dynasty 42 decadal