Related by context. Frequent words. (Click for all words.) 69 Cretaceous 68 Carboniferous 68 Paleocene 67 Upper Cretaceous 67 Triassic 65 Miocene 65 Devonian 64 Eocene 64 Lower Cretaceous 64 Oligocene 64 Paleozoic 63 Mesozoic 63 depositional 62 Late Cretaceous 61 Ordovician 61 Pliocene 61 Early Cretaceous 60 Precambrian 60 Archaean 59 stratiform 59 Proterozoic 59 sedimentary basin 59 Silurian 58 Jurassic 58 carbonate reservoirs 58 basaltic 57 schists 57 limestones 57 tuffs 57 sandstones 57 volcanogenic massive sulphide 56 siliceous 56 sedimentary rock 56 massive sulphide deposits 56 felsic volcanic 56 metamorphic rocks 56 alluvial deposits 56 Cadomin 56 surficial 55 overlies 55 skarn mineralization 55 alluvium 55 geologically 55 interbedded 55 carbonate replacement 55 areal extent 55 mudstone 55 hydrothermal breccia 55 sedimentary rocks 55 massive sulphide deposit 54 Quaternary 54 stratigraphically 54 basalts 54 graben 54 Pekisko 54 porosities 54 Albian 54 sandstone reservoirs 54 hornfels 54 magnetite mineralization 54 siltstones 53 banded iron 53 Bakken formation 53 placer deposits 53 sedimentary 53 igneous rocks 53 Lower Tertiary 53 porphyry copper molybdenum 53 gossans 53 granitic 53 supergene 53 jasperoid 53 porphyries 53 argillite 53 Gippsland Basin 53 calcareous 53 Uranium mineralization 53 Archean 53 gneiss 53 vuggy silica 53 intrusives 52 radiometric anomaly 52 marine sediments 52 stratigraphic 52 stratabound 52 glacial till 52 igneous 52 Geologically 52 geological 52 mafic volcanic rocks 52 VMS deposit 52 Mesolithic 52 diatreme 52 magmatic 52 diorite 52 facies 52 igneous rock 52 Burgess Shale 52 quartz monzonite 52 Tertiary 52 low sulphidation epithermal