Related by context. Frequent words. (Click for all words.) 68 Ordovician 68 Paleocene 67 Oligocene 66 Carboniferous 66 Cretaceous 65 Late Cretaceous 65 Miocene 64 Eocene 64 Upper Cretaceous 62 Mesozoic 62 depositional 62 Paleozoic 62 Triassic 62 Pliocene 61 Lower Tertiary 61 Lower Cretaceous 61 Early Cretaceous 61 Archaean 61 biogeochemical 60 extensional 59 Devonian 59 Geologically 59 Precambrian 58 magmatic 58 sedimentary basin 58 Quaternary 58 graben 58 deglaciation 57 hydrothermal activity 57 alluvial deposits 57 Proterozoic 57 geologic 57 volcanism 57 Paradox Basin 56 igneous rocks 56 Wolfcamp 56 geologically 56 hydrothermal vent 56 terrestrial ecosystems 56 sedimentary basins 56 Montney formation 56 volcanogenic massive sulphide 55 marine sediments 55 Albian 55 mud volcanoes 55 deltaic 55 Chattanooga Shale 55 vuggy silica 55 Cadomin 55 Archean 55 Silurian 55 stratiform 55 massive sulphide deposits 55 areal extent 55 Cooper Eromanga Basin 55 deepwater discoveries 55 hydrothermal breccia 55 mineralizing 55 faunal 54 Gippsland Basin 54 basaltic 54 Jurassic 54 calcareous 54 basalts 54 Pekisko 54 massive sulphide deposit 54 stratigraphically 54 interbedded 54 methane hydrate 54 Carbonate 54 Cambrian explosion 54 porphyry mineralization 54 Younger Dryas 54 felsic volcanic 54 carbonate reservoirs 54 temperate forests 54 NE trending 54 drillable 54 Pleistocene 53 biogenic 53 diamondiferous kimberlites 53 Cretaceous Period 53 metamorphic rocks 53 Shouyang Block 53 magmas 53 Geochemistry 53 radiometric anomaly 53 Albany Shale 53 Geological mapping 53 jasperoid 53 geological formations 53 overlies 53 siliceous 53 Valles Marineris 53 Dry Valleys 53 biodiversity hotspot 53 copper molybdenum porphyry 53 igneous 53 tuffs 52 Burgess Shale 52 Ni Cu