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Geologic groups by lithology
Andesite groups
Basalt groups
Chert groups
Claystone groups
Coal groups
Conglomerate groups
Dacite groups
Dolomite groups
Ichnofossiliferous groups
Limestone groups
Marl groups
Mudstone groups
Ooliferous groups
Quartzite groups
Rhyolite groups
Sandstone groups
Schist groups
Shale groups
Siltstone groups
Slate groups
Tuff groups
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