Related by context. Frequent words. (Click for all words.) 67 fossils 62 lake sediments 61 sediment cores 60 radiocarbon 60 fossil 59 oxygen isotopes 58 sediments 58 fossilized remains 58 isotopic 57 trilobites 56 radiocarbon dating 56 middens 54 geologic 54 sediment samples 54 melanosomes 54 paleontological 54 archaea 54 diatoms 54 nitrogen fixation 54 palaeontologists 53 fossilized bones 53 meteorites 53 dinosaur footprints 53 fossilized 53 diatom 53 palaeontologist 53 geological formations 53 Fossils 53 taxa 52 olivine 52 megafauna 52 sedimentary rock 52 mineralogy 52 terrestrial ecosystems 52 iron oxides 52 Late Cretaceous 52 morphological 52 journal Geology 52 morphologies 52 soils 51 palaeontology 51 geochemical 51 hominins 51 Eocene 51 dinosaur fossils 51 microscopic organisms 51 Precambrian 51 geological 51 abundances 51 carnivorous dinosaurs 51 Archaea 51 Carboniferous 51 zeolites 51 landforms 50 eukaryotic 50 stalagmite 50 archaeological finds 50 Neanderthal DNA 50 Ordovician 50 dinosaur fossil 50 organic molecules 50 Quaternary 50 mammoths 50 geochemistry 50 baleen whales 50 specimens 50 basalts 50 rocky planets 50 mineralogical 50 marine organisms 50 biogenic 50 Geochemistry 50 multicellular organisms 50 sedimentary 50 lichens 50 sauropod 49 biological molecules 49 skull fragments 49 stable isotope 49 astrobiologists 49 sediment 49 sauropods 49 regolith 49 archaeological 49 volcanism 49 Ardipithecus 49 biota 49 paleontologists 49 glaciation 49 organic compounds 48 tyrannosaurs 48 geologic formations 48 sedimentary rocks 48 woolly mammoths 48 apatite 48 single celled 48 Pliocene 48 archeological 48 Computer simulations 48 calcite 48 dinosaur bones