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Cenozoic Quaternary Tertiary Mesozoic Cretaceous Jurassic
Triassic
Palaeozoic Permian Carboniferous Mississippian Pennsylvanian
Devonian
Silurian Ordovician Cambrian
Andesite Basalt Breccia Chalk Clay Diorite Dolomoite Gabbro
Gneiss Granite
Hornfels Limestone Marble Marl Mudstone Nevadite Obsidian
Pitchstone
Pumice Quartzite Rhyolite Sandstone Shale Silt Slate
Bauxite Cassiterite Chalconite Chrome Cinnabar Gold Magnesite
Silver
Diamond Ruby Sapphire Topaz Emerald Amethyst Onyx Opal
Turquoise
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