Category:Porphyritic phonolite
Subcategories
This category has only the following subcategory.
Media in category "Porphyritic phonolite"
The following 3 files are in this category, out of 3 total.
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Porphyritic phonolite (Eocene, 49 Ma; Devils Tower, northeastern Wyoming, USA) 2.jpg 1,995 × 2,289; 2.44 MB