Related by context. Frequent words. (Click for all words.) 73 Cretaceous Period 66 Late Cretaceous 58 Pleistocene 57 Cretaceous 57 dinosaurs roamed 56 interglacial 55 Carboniferous 54 glaciation 53 Eocene 53 Pliocene 53 Ice Age 52 anatomically modern 51 fossils 51 Ordovician 51 Mesozoic 50 Australopithecus afarensis 50 Posted -# sec 50 megafauna 50 dinosaurs 50 Homo erectus 50 Fertile Crescent 50 Homo sapiens 50 Homo habilis 49 Australopithecus 49 hominins 49 prehistoric 49 fossil 49 mass extinctions 49 Neandertals 48 landmasses 48 hominid 48 tyrannosaurs 48 Quaternary 48 Gondwana 48 hominids 47 Precambrian 47 fossilized remains 47 Triassic 47 mammoths 47 Jurassic 47 dinosaur footprints 47 Little Ice Age 46 prehistory 46 sauropod 46 Archaeopteryx 46 dinosaur fossil 46 biodiversity hotspots 46 mass extinction 46 carnivorous dinosaurs 45 Holocene 45 sauropods 45 woolly mammoths 45 Oligocene 45 fossilized bones 45 continental drift 45 common ancestor 45 tyrannosaur 44 western lowland gorillas 44 Medieval Warm Period 44 Neanderthals 44 theropods 44 coelacanth 44 millennia 44 interbred 44 Denisovans 44 #BC [003] 44 ancient Mesopotamia 44 volcanism 44 Ellesmere Island 43 Paleolithic 43 Mentalist CBS #.# 43 Miocene 43 tetrapods 43 sediments 43 sedimentary rock 43 dinosaur fossils 43 Tiktaalik 43 millenniums 43 vertebrate species 43 Fossils 42 palaeontologists 42 landforms 42 mammal 42 lithosphere 42 PETM 42 mammal species 42 Ardipithecus 42 Neolithic 42 Ming Dynasty #-# 42 Mayan civilization 42 multicellular 42 influenza pandemics 42 middens 42 plate tectonics 41 giant tortoises 41 Great Rift Valley 41 lake sediments 41 Devonian 41 pterosaur 41 Paleontologists 41 hunter gatherers