Related by context. Frequent words. (Click for all words.) 57 fossil 55 microfossils 54 fossils 53 marine sediments 52 stromatolites 52 palaeontology 51 mammal species 51 coelacanth 51 marine reptiles 51 theropod 50 fossilized remains 50 journal Geology 50 frog species 50 terrestrial ecosystems 50 mammals 50 diatom 50 coprolites 50 atmospheric methane 50 biodiversity hotspots 50 megafauna 49 sauropod 49 H. erectus 49 Homo floresiensis 49 biota 49 hominin 49 marine invertebrates 48 extinctions 48 lake sediments 48 Denisovans 48 palaeontologist 48 mammal 48 Late Cretaceous 48 interglacial period 48 tyrannosaur 48 vertebrate 48 paleontological 48 plesiosaur 47 Tiktaalik 47 lungfish 47 genus Homo 47 hominid 47 vertebrates 47 sauropods 47 theropods 47 pygmy elephants 47 dinosaur fossil 46 Paleocene 46 Cretaceous Period 46 hadrosaur 46 trilobites 46 sediment cores 46 breeding colony 46 dinosaur fossils 46 zircons 46 taxa 46 leatherback turtle 46 fossilized 46 hominins 46 pterosaur 45 fossilized bones 45 thylacine 45 Archaeopteryx 45 western lowland gorillas 45 species 45 Ardipithecus 45 carnivorous dinosaurs 45 dinosaur footprints 45 retreating glaciers 45 isotopic 45 mammalian species 44 palaeontologists 44 Pleistocene 44 specimens 44 middens 44 baleen whales 44 morphological 44 Australopithecus afarensis 44 Poinar 44 amphibian species 44 crocodilians 44 primate species 44 invertebrates 44 extinct species 44 volcanism 44 moa 44 coral species 44 Hawaiian Volcano Observatory 43 atmospheric carbon dioxide 43 vertebrate species 43 Natural History Survey 43 avian species 43 Paabo 43 oxygen isotopes 43 journal Biology Letters 43 Geoscience Australia 43 colossal squid 43 radiocarbon dating 43 Eocene 43 Sumatran rhinos 43 Neanderthal DNA 43 paleontologists