Related by context. Frequent words. (Click for all words.) 72 basalts 70 basalt 69 tuffs 68 lavas 67 igneous 67 calcareous 66 siliceous 65 olivine 65 felsic 65 glacial till 65 limestones 65 calcite 64 gneiss 64 magmatic 64 volcanic 63 graphitic 63 volcanic rocks 63 volcanics 63 sericite 63 silicates 62 mudstone 62 andesite 62 carbonaceous 62 banded iron 62 spherules 62 sedimentary rocks 62 sedimentary 62 granitic 61 biotite 61 breccia zones 61 metasedimentary rocks 61 sedimentary rock 61 sulphide bearing 61 continental crust 61 stratabound 61 hydrothermal breccias 60 granites 60 volcanic rock 60 peridotite 60 argillite 60 gabbro 60 mafic 60 potassic alteration 60 ejecta 60 syenite 60 pyritic 60 crustal 60 lithosphere 60 outcrops 59 jasperoid 59 facies 59 intrusives 59 Geologically 59 schist 59 alluvium 59 iron oxides 59 brecciated 59 siltstone 59 porphyries 59 silicified 59 gossan 59 ultramafic rocks 58 diorite 58 outcrop 58 silicate 58 graben 58 overlie 58 carbonate rocks 58 ultramafic 58 volcanism 58 intrusive rocks 58 chalcocite 58 magnetic anomalies 58 auriferous 58 zircons 58 carbonate 58 pegmatites 58 Precambrian 57 hydrothermal alteration 57 bornite 57 Uranium mineralization 57 oxidized 57 geologically 57 Ni Cu 57 overlies 57 metasediments 57 carbonatite 57 Proterozoic 57 rhyolite 57 breccias 57 lithological 56 mineralizing 56 oceanic crust 56 quartzite 56 pathfinder elements 56 regolith 56 disseminated sulphides 56 granodiorite 56 geologic 56 overlain 56 stratigraphy