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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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