Related by context. Frequent words. (Click for all words.) 57 Burgess Shale 56 dinosaur bones 56 lava tubes 55 fossils 55 paleontology 54 palaeontology 53 dinosaur fossils 53 archeological digs 53 prehistoric creatures 53 paleontological 53 marine reptiles 53 prehistoric 52 stegosaurus 51 geologic 51 dinosaur footprints 51 igneous rocks 50 Prehistoric 50 dinosaur 50 paleontologists 50 archeological dig 50 Mesozoic 50 limestone caves 50 limestone cave 50 rock outcrops 50 fossilized bones 50 cliff dwellings 50 Bighorn Basin 49 dino 49 fossil 49 dinosaur fossil 49 Late Cretaceous 49 dinosaurs 49 dinosaur skeletons 49 hydrothermal vent 49 tyrannosaurus rex 49 woolly mammoths 48 archaeological dig 48 geology 48 palaeontologist 48 geological 48 trackways 48 paleontologist 48 Brachiosaurus 48 rock outcrop 48 trilobites 48 archeological 48 wooly mammoth 48 African savanna 47 mud volcanoes 47 Columbian mammoth 47 lava tube 47 Carlsbad Caverns 47 Valles Marineris 47 Chihuahuan Desert 47 dinosaur skeleton 47 Paleocene 47 Lassen Volcanic National 47 carnivorous dinosaurs 46 Dinosaur 46 archeology 46 sedimentary rock 46 Mammoths 46 archaeological 46 prehistory 46 unconformity type 46 Palaeontology 46 Namib Desert 46 Lake Vostok 46 hadrosaur 46 Palaeolithic 46 plesiosaur 46 dinosaur eggs 46 feathered dinosaurs 45 Pleistocene 45 Precambrian 45 Diplodocus 45 coprolites 45 petroglyph 45 cave explorers 45 Ghost Ranch 45 volcanogenic massive sulphide 45 artifacts 45 mastodon 45 igneous rock 45 dinos 45 mammoths 45 Inca Empire 45 triceratops 45 geologically 45 Cretaceous 45 archeologists 45 Fossils 45 petrified wood 45 T rex 45 landforms 45 flora fauna 45 Chaco Canyon 45 Jurassic Period 45 Sandia Mountains 45 geological formations 45 geologic formations