Related by context. Frequent words. (Click for all words.) 52 trackways 45 petrified wood 44 excavated 44 caliche 43 fossilized bones 43 calcareous 43 radiocarbon dated 43 limestone cave 42 INAH 42 middens 42 Fossilized 42 chert 42 funerary objects 42 Mimbres 42 kangaroo rat 42 Atapuerca 42 Columbian mammoth 41 Cerro Rico 41 Acoma Pueblo 41 rock outcrops 41 dinosaur bones 41 El Mirador 41 sandstone 40 streambeds 40 archeological 40 Paracas 40 limestone 40 Monte Verde 40 sedimentary rock 40 fossils 40 Olmecs 40 fossil specimens 40 petroglyph 40 revegetate 40 lava tubes 40 Lambayeque 40 Madre de Dios 40 Inca Empire 40 igneous rock 39 paleontological 39 fossilized 39 Radiocarbon dating 39 mudstone 39 sandstone formations 39 Ponderosa pine 39 cliff dwellings 39 lichens 39 archaeologically 39 temperate rainforest 39 whale skeleton 39 Chaco Canyon 39 petroglyphs 39 montane 39 Chaco 39 dinosaur footprints 39 lakebed 38 archeologists 38 microfossils 38 trackway 38 Poinar 38 El Rosario 38 volcanic rock 38 Guano 38 Mesoamerican 38 marl 38 skull fragments 38 metamorphic rocks 38 Tiwanaku 38 fossil 38 limestone caves 38 plesiosaurs 38 Bighorn sheep 38 federally endangered 38 Book Cliffs 38 primeval forest 38 Incan 37 Chiappe 37 faunal 37 bones 37 creekbed 37 hadrosaur 37 Inca 37 Lapita 37 Bone fragments 37 archaeological 37 Parral 37 excavation 37 clasts 37 Cerrillos 37 inter tidal 37 dinosaur fossil 37 pre Incan 37 riparian habitat 36 Inca empire 36 ammonites 36 limestones 36 preserved 36 reforested 36 Abydos 36 horned dinosaur 36 Chimayo