Related by context. Frequent words. (Click for all words.) 58 tar pits 57 Columbian mammoth 55 La Brea Tar Pits 55 fossils 53 Jurassic Period 52 Fossilized 52 Burgess Shale 51 Paleocene 51 Mono Lake 51 fossilized remains 51 microfossils 50 Early Cretaceous 50 fossil 50 San Timoteo Canyon 50 Late Cretaceous 50 marine sediments 50 prehistoric 50 Wildfire burns 49 trilobites 49 baleen whale 49 hydrothermal vent 49 dinosaur fossils 49 lava tubes 49 limestone cave 49 Mesozoic 49 marine reptiles 49 trackway 49 tubeworms 49 radiocarbon dated 49 Stegosaurus 49 stromatolites 48 Mummified 48 fossil specimens 48 sandstone formations 48 Lower Cretaceous 48 feathered dinosaurs 48 fossilized 48 dinosaur footprints 47 Siberian permafrost 47 dinosaur fossil 47 limestone caves 47 Atapuerca 47 ammonites 47 Cenozoic 47 coprolites 47 fossilized bones 47 flint tools 47 paleontological 47 Palaeontology 47 calcareous 47 wooly mammoth 47 Alluvial 47 mudstone 47 Diplodocus 46 Jurassic 46 geologic formations 46 Suisun Marsh 46 middens 46 Upper Cretaceous 46 paleontology 46 Fossils 46 saber toothed cat 46 excavated 46 Wildfire Burns 46 dinosaur bones 46 woolly mammoths 46 igneous rock 46 Zhucheng 46 whale skeleton 46 Bone fragments 46 Carboniferous 46 marine invertebrates 46 marine reptile 45 Eocene 45 trackways 45 tyrannosaurus 45 preserved fossils 45 Quaternary 45 Santa Ana Mountains 45 salt flats 45 theropod 45 Namib Desert 45 sedimentary rock 45 plesiosaur 45 Giant Squid 45 temperate rainforest 45 tusk 45 ground sloths 45 Allosaurus 45 Paleontologist 45 streambeds 45 geologic 45 inter tidal 44 horned dinosaur 44 Paleontology 44 giant sequoia 44 terra cotta warriors 44 Paleozoic 44 Palaeolithic 44 mastodon 44 barrens