Category:Oligocene igneous rocks in Colorado
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This category has the following 2 subcategories, out of 2 total.
Media in category "Oligocene igneous rocks in Colorado"
The following 2 files are in this category, out of 2 total.
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Phonolite (Cripple Creek Diatreme, Oligocene; Beacon Hill, Colorado, USA) (40770908114).jpg 2,476 × 1,637; 3.14 MB