Related by context. Frequent words. (Click for all words.) 76 Cretaceous 74 Ordovician 73 Mesozoic 73 Proterozoic 72 Triassic 71 Eocene 71 Miocene 71 Precambrian 68 Devonian 67 Oligocene 66 Late Cretaceous 66 sedimentary rocks 66 intrusive rocks 65 limestones 64 Jurassic 64 Pliocene 64 sedimentary 63 volcanics 62 sandstones 62 stratigraphy 62 mafic 61 intrusives 61 volcanic rocks 60 siltstone 60 sedimentary basin 60 granitic 60 Pleistocene 60 overlies 59 metasediments 59 sedimentary rock 59 Archean 58 gneiss 58 granodiorite 58 breccia 58 ultramafic 58 magmatic 58 felsic 57 gabbro 57 banded iron 57 diorite 57 andesite 57 geologically 57 stratigraphic 57 anticline 57 ultramafic rocks 56 carbonatite 56 sediments 56 footwall 55 hydrothermal alteration 55 underlain 55 unconformity 55 shallow depths 55 Tertiary 55 peridotite 55 skarn 55 structurally controlled 55 stockwork 55 lithologies 55 granites 55 lithology 55 shear zones 54 Formation 54 massive sulfide 54 porphyry 54 overlying 54 carbonate 54 silicified 54 carbonaceous 53 hydrothermal 53 breccias 53 undrilled 53 brecciated 53 uranium mineralization 53 steeply dipping 53 mineralization occurs 52 Geologically 52 northwest trending 52 northeast trending 52 massive sulphide mineralization 52 bearing quartz veins 52 mineralizing 52 sulfide mineralization 52 mineralized 52 fluvial 51 sulphides 51 alluvium 51 rhyolite 51 volcanism 51 diamondiferous 51 pegmatite 51 Holocene 51 crustal 51 epithermal 51 shales 51 sulphide 51 geologic 51 mineralized horizon 51 shear zone 51 manto 51 mineralization 51 alteration zones