Related by context. Frequent words. (Click for all words.) 61 dinosaurs 61 Late Cretaceous 57 Cretaceous 54 Mesozoic 53 Pleistocene 52 Triassic 52 Archaeopteryx 52 prehistoric 51 prehistory 51 fossilized remains 51 Precambrian 50 Jurassic 50 Pliocene 50 Homo sapiens 49 Ordovician 49 sauropods 49 Fertile Crescent 49 Han Dynasty 49 fossils 48 Paleozoic 48 dinosaur 47 fossilized 47 megafauna 47 tyrannosaurs 47 Australopithecus 47 hominid 46 Eocene 46 extinct 46 fossil 46 Paleolithic 46 #BC [003] 45 homo sapiens 45 mammoths 45 theropods 45 Mammoths 45 Ming dynasty 45 Homo erectus 45 sauropod 45 palaeontologists 45 Miocene 45 paleontologists 44 Medieval Warm Period 44 epoch 44 Neanderthals 44 Fossils 44 T. rex 44 fossilized bones 44 single celled organisms 44 Prehistoric 44 millenniums 44 Ming Dynasty 44 Neandertals 44 dinos 44 hominids 43 mass extinction 43 Ice Age 43 ancient civilization 43 pterosaur 43 dinosaur fossils 43 #AD [002] 43 #BC [002] 43 glaciation 43 Proterozoic 42 Iron Age 42 ancient 42 Bronze Age 42 woolly mammoths 42 mass extinctions 42 woolly mammoth 42 Neolithic 42 Vertebrate Paleontology 42 tetrapods 42 Holocene 42 Tyrannosaurus 42 millennia 41 evolutionary 41 hunter gatherers 41 herbivore 41 Devonian 41 mastodons 41 Hellenistic 41 millenia 41 vertebrate 41 mammals 41 extinct species 41 herbivorous 41 Little Ice Age 41 T. Rex 41 Roman Empire 41 Paleontologists 41 pterosaurs 40 Homo floresiensis 40 Triceratops 40 ancients 40 Qing Dynasty #-# 40 radiocarbon dating 40 sedimentary rocks 40 Tyrannosaurus rex 40 pterodactyl 40 Gondwana 40 eons