Related by context. Frequent words. (Click for all words.) 75 Late Cretaceous 70 Cretaceous Period 70 Cretaceous 66 Carboniferous 65 Eocene 64 Mesozoic 64 Triassic 62 fossils 62 Pleistocene 61 Ordovician 61 Pliocene 60 Precambrian 59 Oligocene 59 fossil 59 trilobites 58 hadrosaur 58 theropods 58 Paleozoic 58 Miocene 58 fossilized remains 58 sauropod 58 Archaeopteryx 57 fossilized 57 hominins 57 Australopithecus 57 Quaternary 56 Fossils 56 sauropods 56 tyrannosaurs 56 interglacial 55 sedimentary rock 55 pterosaur 55 tyrannosaur 55 Tiktaalik 55 Jurassic 55 hominid 55 glaciation 55 palaeontologists 55 fossilized bones 54 dinosaur footprints 54 Neandertals 54 Proterozoic 54 Ardipithecus 54 Homo habilis 54 mudstone 53 hominin 53 tetrapods 53 taxa 53 sedimentary rocks 53 geologically 52 marine reptiles 52 dinosaur fossils 52 prehistory 52 baleen whales 52 dinosaur fossil 52 genus Homo 52 vertebrate 52 marine sediments 52 Paleolithic 52 megafauna 52 Silurian 52 Devonian 52 hominids 51 lake sediments 51 Homo erectus 51 limestones 51 prehistoric 51 carnivorous dinosaurs 51 Australopithecus afarensis 51 plesiosaur 51 Longrich 51 oceanic crust 50 mammals 50 sediments 50 calcareous 50 diatom 50 dinosaurs 50 basalts 50 clade 50 sediment cores 50 vertebrates 49 morphological 49 sedimentary basin 49 anatomically modern 49 dinosaurs roamed 49 clades 49 lineages 49 Homo sapiens 49 Fertile Crescent 49 calcite 49 mammal species 49 multicellular 49 facies 49 paleontologists 49 Neolithic 49 tuffs 49 shallow depths 49 Holocene 48 Vertebrate Paleontology 48 Uranium mineralization 48 paleontological