Category:Metavolcanic rocks in Wisconsin

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Media in category "Metavolcanic rocks in Wisconsin"

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Black porphyritic metarhyolite (Utley Rhyolite, Paleoproterozoic, 1765 Ma; Utley Rhyolite Quarry, near Green Lake, Wisconsin, USA) 3.jpg 3,668 × 1,913; 4.59 MB

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