Related by context. Frequent words. (Click for all words.) 78 Cretaceous 77 Triassic 75 Eocene 74 Ordovician 73 Lower Cretaceous 73 Paleozoic 72 Proterozoic 71 Miocene 71 Oligocene 70 Silurian 70 Devonian 70 Late Cretaceous 70 Mesozoic 69 Pliocene 67 Precambrian 65 Jurassic 63 Pleistocene 63 Quaternary 63 sedimentary rocks 60 sedimentary basin 59 Cretaceous Period 59 Archean 59 limestones 57 basalts 56 trilobites 56 geologically 56 Geologically 55 intrusives 55 lavas 55 volcanic rocks 55 massive sulfide 55 sandstones 55 glaciation 55 Uranium mineralization 55 stratigraphy 55 overlies 54 sedimentary 54 continental crust 54 sedimentary rock 54 intrusive rocks 54 lithology 54 banded iron 54 skarn mineralization 54 tuffs 54 updip 54 stratigraphic 53 siliceous 53 Holocene 53 undrilled 53 shales 53 fossils 53 facies 53 overlie 53 igneous 53 areal extent 53 diamondiferous 53 auriferous 53 volcanics 53 sulphide bearing 53 marine sediments 53 granitic 53 carbonatite 53 magmatic 53 carbonate rocks 52 Ni Cu 52 shallow depths 52 interglacial period 52 volcanism 52 granites 52 intersected mineralization 52 kimberlite pipe 52 alluvium 52 interglacial 52 calcareous 52 Kimberlite 52 nickel sulphides 52 peridotite 52 radiometric anomaly 52 oceanic crust 52 Tertiary 52 geologic 52 syenite 52 siltstone 51 sediments 51 massive sulphide mineralization 51 carbonaceous 51 lithologies 51 microfossils 51 porphyries 51 kimberlite pipes 51 epithermal gold silver 51 gneiss 51 hydrocarbon bearing 50 Geochemistry 50 sulphides 50 metasediments 50 sedimentary basins 50 unconformity 50 goldfield 50 carbonate 50 megafauna