Related by context. Frequent words. (Click for all words.) 84 Triassic 80 Eocene 79 Miocene 76 Mesozoic 76 Ordovician 72 Devonian 72 Jurassic 69 Pleistocene 68 Precambrian 61 sedimentary rocks 60 sandstones 58 geologically 57 dinosaurs 56 sedimentary 56 Archean 55 stratigraphic 55 sediments 55 sedimentary rock 54 hydrothermal 54 fossils 54 fossil 54 glaciation 54 stratigraphy 54 geologic 54 porphyry 54 volcanics 54 intrusive rocks 54 volcanism 53 mineralized 53 shallow depths 53 breccia 53 volcanic rocks 53 undrilled 52 massive sulphide mineralization 52 mineralization 51 Tertiary 51 anticline 51 gabbro 51 uranium mineralization 50 Fossils 50 Homo erectus 50 sauropod 50 Archaeopteryx 50 molybdenum mineralization 50 epithermal 50 shales 50 footwall 50 fossilized remains 50 hydrocarbon bearing 50 hydrothermal alteration 50 Australopithecus 50 ultramafic 50 geological 50 Holocene 49 paleo 49 carbonate 49 Paleolithic 49 copper mineralization 49 sauropods 49 structurally controlled 49 gold mineralization 49 skarn 49 sulphide 49 stockwork 49 caldera 49 mammoths 49 granites 49 sulphide mineralization 49 shear zones 49 prehistoric 49 mass extinction 48 unconformity 48 dinosaur 48 mafic 48 sulphides 48 granodiorite 48 kimberlite 48 massive sulphide 48 massive sulphides 48 Permian 48 geochemical 48 Triceratops 47 hominid 47 underlain 47 Bakken formation 47 pegmatite 47 Ice Age 47 Mineralization 47 delineation drilling 47 Neolithic 47 porphyry copper 46 breccias 46 hominids 46 infill drilling 46 lodes 46 shear zone 46 fossilized 46 radiocarbon 46 overlying 46 Kimberlite 46 lithologies