Related by context. Frequent words. (Click for all words.) 80 Cretaceous 78 Miocene 76 Triassic 76 Pliocene 74 Ordovician 71 Mesozoic 71 Paleozoic 70 Proterozoic 69 Devonian 68 Jurassic 67 Pleistocene 66 Precambrian 61 geologically 59 limestones 58 sandstones 57 sedimentary rocks 57 Archean 57 sedimentary 57 Holocene 57 glaciation 55 geologic 55 stratigraphic 54 fossils 54 volcanics 54 volcanism 54 intrusive rocks 54 fossil 53 volcanic rocks 53 stratigraphy 53 sediments 52 sedimentary rock 52 magmatic 52 hydrothermal 52 shallow depths 51 carbonatite 51 lithology 51 paleo 51 Fossils 51 granites 51 hydrothermal alteration 51 massive sulfide 51 lithologies 51 shales 50 carbonate 50 epithermal 50 radiocarbon 50 breccia 50 caldera 50 peridotite 50 porphyry 50 undrilled 49 diamondiferous 49 Tertiary 49 massive sulphide mineralization 49 geological 49 Australopithecus 49 andesite 48 geological formations 48 crustal 48 lake sediments 48 sulfide mineralization 48 Kimberlite 48 banded iron 48 isotopic 48 anticline 48 copper mineralization 48 mineralized corridor 48 mineralized horizon 48 hominids 48 Mineralisation 48 molybdenum mineralization 48 Formation 47 hydrocarbon bearing 47 theropods 47 Medieval Warm Period 47 fossilized remains 47 Paleolithic 47 geologic formations 47 VMS deposits 47 intersected mineralization 47 sulphide 47 mineralization 47 Archaeopteryx 47 mafic 47 gossan 47 ultramafic 47 epithermal gold 47 gabbro 47 mineralized 47 kimberlite 47 unconformity 47 stockwork 47 Homo erectus 47 gold mineralization 47 bearing quartz veins 47 underlain 46 geochemical 46 kimberlite pipes 46 mammoths 46 Ice Age 46 radiometric anomalies