Related by context. Frequent words. (Click for all words.) 71 Late Cretaceous 67 Cretaceous Period 67 Cretaceous 67 Triassic 65 Carboniferous 65 Ordovician 64 Eocene 63 Jurassic 62 Pliocene 62 Precambrian 61 Paleozoic 60 Proterozoic 60 Pleistocene 60 fossils 59 Mesozoic 59 Silurian 59 trilobites 58 Oligocene 58 interglacial 57 Miocene 57 Archaeopteryx 57 Devonian 56 Quaternary 55 Neolithic 55 Australopithecus 54 hominins 54 prehistoric 54 genus Homo 54 dinosaurs roamed 54 tyrannosaur 54 sedimentary rocks 54 Ardipithecus 54 sedimentary rock 54 theropods 54 Bronze Age 53 Fossils 53 Paleolithic 53 Neandertals 53 fossil 52 fossilized remains 52 Holocene 52 dinosaurs 52 sauropods 52 marine sediments 52 prehistory 52 Denisovans 51 fossilized bones 51 Tiktaalik 51 pterosaur 51 Homo habilis 51 anatomically modern 51 Australopithecus afarensis 50 hominids 50 hominid 50 Homo erectus 50 glaciation 50 sauropod 50 hominin 50 plesiosaur 50 multicellular 49 geologically 49 vertebrates 49 tyrannosaurs 49 dinosaur fossils 49 carnivorous dinosaurs 49 dinosaur footprints 49 Fertile Crescent 49 tetrapods 48 Homo sapiens 48 basalts 48 volcanism 48 Archean 48 geologic 48 sediments 48 multicellular organisms 48 megafauna 48 calcite 48 radiocarbon dating 47 Neanderthals 47 dinosaur fossil 47 lithosphere 47 mammoths 47 Geologically 47 Hellenistic 47 mudstone 47 Little Ice Age 47 Weddell Sea 46 paleontological 46 lake sediments 46 siliceous 46 common ancestor 46 dinosaur bones 46 Geological mapping 46 radiocarbon 46 millennium BC 46 skarn mineralization 46 sedimentary basin 46 Archaic 46 Neanderthal 46 plate tectonics 46 super Earths