Related by context. Frequent words. (Click for all words.) 69 Cretaceous 67 Eocene 64 Triassic 62 glaciation 60 Paleolithic 60 Holocene 60 Jurassic 59 Ice Age 59 mammoths 59 fossils 58 Miocene 58 prehistoric 57 dinosaurs 57 prehistory 56 hominid 56 woolly mammoths 55 Homo sapiens 55 hominids 55 Neanderthals 54 fossil 53 Homo erectus 53 mastodons 53 sauropods 52 Little Ice Age 52 paleo 52 hunter gatherers 52 Neolithic 52 volcanism 51 glacial 51 Neanderthal 51 plate tectonics 51 sauropod 50 Prehistoric 49 mass extinction 49 Devonian 49 woolly mammoth 49 paleontological 48 paleontologists 48 glaciers 48 mass extinctions 48 homo sapiens 48 Fossils 48 Bronze Age 47 PETM 47 hunter gatherer 47 dinosaur 47 fossilized 47 geologic 47 mammals 47 sediments 47 palaeontologists 47 sedimentary rocks 47 landforms 47 diatoms 46 mastodon 46 vertebrates 46 dinosaur fossils 46 domestication 46 radiocarbon 46 geologically 46 T. rex 45 taxa 45 hydrothermal 45 Paleo 45 Iron Age 44 speciation 44 sedimentary rock 44 fossilized remains 44 vertebrate 44 Gondwana 44 Ellesmere Island 44 permafrost 44 Arctic tundra 44 caldera 44 radiocarbon dating 43 paleontology 43 tropics 43 Mammals 42 latitudes 42 sedimentary 42 pterosaurs 42 isotopic 42 Triceratops 42 extinctions 42 atmospheric CO2 42 evolutionarily 42 morphological 42 Cambrian 42 dino 41 colonization 41 Cold War 41 paleontologist 41 volcanic rocks 41 Archean 41 herbivores 41 Paleontology 41 mammal 41 herbivore 41 atmospheric carbon dioxide 41 twentieth century 40 dinos