Related by context. Frequent words. (Click for all words.) 50 mudstone 49 salt crystals 49 igneous rocks 49 siliceous 48 clasts 48 glacial till 47 kimberlitic 47 calcrete 47 basalts 47 schists 46 surficial 46 sediments 46 massive sulphide deposits 45 sedimentary 45 Silurian 45 sedimentary rock 45 porosities 45 inter tidal 45 magmatic 45 granitic 44 tuffs 44 igneous rock 44 iron oxides 44 gravels 44 marine sediments 44 diamondiferous 44 overlying 44 interbedded 44 gneiss 44 alluvium 43 depositional 43 graben 43 lunar soil 43 regolith 43 silty 43 sediment 43 stromatolites 43 coarse sand 43 Upper Cretaceous 43 auriferous 43 oceanic crust 43 Carboniferous 42 Paleozoic 42 protozoan 42 lakebed 42 Lower Cretaceous 42 volcanogenic massive sulphide 42 limestones 42 hydrothermal vent 42 subsurface 42 kimberlite pipes 42 overlies 42 igneous 42 Mineralized 42 skarn mineralization 42 sedimentary rocks 41 Precambrian 41 sandstones 41 surface 41 lava tubes 41 decomposed granite 40 magma chamber 40 stratigraphic 40 silica 40 nanosized 40 Jurassic Period 40 sandstone 40 Quaternary 40 Oligocene 39 stratigraphy 39 shallow depths 39 hydrothermal 39 lavas 39 continental crust 39 trilobites 39 geological formations 39 diorite 39 extensional 39 carbonate reservoirs 39 foraminifera 39 Jurassic 39 Lake Vostok 39 mineralized 39 EM anomalies 38 Namib Desert 38 geologically 38 temperature gradient 38 silicates 38 volcanic rocks 38 Burgess Shale 38 Fossilized 38 massive sulphide mineralization 38 Skarn 38 uranium mineralization 37 Paleocene 37 morphologically 37 Sedum 37 areal extent 37 hydrothermal alteration 37 diamondiferous kimberlites 37 Cretaceous