Related by context. Frequent words. (Click for all words.) 61 Ardipithecus ramidus 59 radiocarbon dated 59 fossils 56 Ardipithecus 56 Australopithecus 56 hydrothermal vent 56 Archaean 55 Early Cretaceous 55 microfossils 55 Paleocene 54 Atapuerca 54 fossil specimens 54 biogeochemical 54 limestone cave 54 stromatolites 54 faunal 54 lake sediments 54 hominid 54 Omo River 53 Australopithecus afarensis 53 Late Cretaceous 52 igneous rocks 52 paleontological 52 Cenozoic 52 Great Rift Valley 52 Gona 52 Emba Derho 52 alluvial deposits 52 hominids 51 Burgess Shale 51 Precambrian 51 graben 51 metamorphic rocks 51 Carboniferous 51 Mesozoic 51 diamondiferous kimberlites 51 geomorphology 51 Lower Cretaceous 51 kimberlitic 51 transect 51 preserved fossils 51 montane 51 paleoclimate 51 dinosaur footprints 51 terrestrial ecosystems 51 geologic 51 marine reptiles 51 flint tools 50 Palaeontology 50 Quaternary 50 Dmanisi 50 journal Geology 50 paleontologists 50 fossilized bones 50 marine sediments 50 H. erectus 50 afarensis 50 biogeochemistry 50 volcanically active 50 trilobites 50 Jurassic Period 50 Palaeolithic 50 hominins 50 depositional 50 ground truthing 50 heavily cratered 50 theropod dinosaurs 50 Geological mapping 50 limestone caves 50 Namib Desert 50 carnivorous dinosaurs 50 transects 50 vertebrate animals 50 hominin 50 Dry Valleys 49 fossil 49 geological 49 coprolites 49 potentially mineable 49 placer deposits 49 undersea volcanoes 49 Upper Cretaceous 49 oceanic crust 49 supercontinent 49 anthropoids 49 glaciated 49 landforms 49 Abydos 49 fossilized remains 49 Paleoanthropology 49 Indohyus 49 ammonites 49 Neandertal 49 biodiversity hotspot 49 volcanogenic massive sulphide 49 feathered dinosaurs 49 surface trenching 49 sediment cores 49 soil geochemical surveys 49 geochemical 49 Poinar