Related by context. Frequent words. (Click for all words.) 51 crustal 51 graben 50 Carboniferous 49 basalts 48 Proterozoic 48 igneous 48 extensional 48 Late Cretaceous 48 Paleocene 48 continental crust 47 sedimentary basin 47 oceanic crust 47 subduction 46 Ordovician 46 Upper Cretaceous 46 supercontinent 46 Paleozoic 46 lithosphere 46 Gondwana 46 depositional 46 Mesozoic 46 Eurasian continent 45 carbonate rocks 45 tectonic 45 calcareous 45 landmasses 45 marine sediments 45 lavas 45 pyroxenite 45 clasts 45 latitudinal 45 tectonics 45 facies 45 landmass 44 graphitic 44 caudal 44 magmatic 44 gneiss 44 sedimentary basins 44 overlain 44 sedimentary 44 basaltic 44 paleo 44 surficial 43 morphology 43 overlies 43 NW trending 43 geologically 43 granitic 43 glaciated 43 schists 43 Tibetan Plateau 43 auriferous 43 Quaternary 43 retreating glaciers 43 carbonaceous 43 ocean ridges 43 Lower Cretaceous 43 Valles Marineris 42 hydrothermal alteration 42 H. erectus 42 skarn mineralization 42 Eocene 42 intrusives 42 volcanics 42 colonized 42 Pleistocene 41 volcanism 41 equatorial 41 mudstone 41 igneous rock 41 Geologically 41 stratigraphy 41 bimodal 41 hydrothermal vent 41 continental drift 41 seismic upheaval 41 homogeneous 41 sulphide bearing 41 Cretaceous Period 41 siliceous 41 oxygen isotopes 41 solar nebula 41 lithological 41 interbedded 41 caldera 41 peninsular 40 fluvial 40 Oligocene 40 plate tectonics 40 sedimentary rocks 40 hydrothermal activity 40 discontinuous 40 subregions 40 mid latitudes 40 Namib Desert 40 massive sulphide deposit 40 Silurian 40 chalcocite 40 sedimentary rock 40 Pliocene