Category:Phonolite in Montana

Subcategories

This category has only the following subcategory.

Media in category "Phonolite in Montana"

The following 4 files are in this category, out of 4 total.

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  Phonolite (Early Eocene, 50-54 Ma; roadcut along Beaver Creek Road, Bearpaw Mountains, Montana, USA) 1 (49057868258).jpg 3,028 × 2,072; 5.56 MB
  
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  Porphyritic phonolite (Shonkin Sag Laccolith, Early Eocene, 50-53 Ma; Buck Ranch, Highwood Mountains, Montana, USA) 1 (49061149591).jpg 3,295 × 2,313; 5.33 MB
  
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  Sandstone-phonolite intrusive contact (Buck Ranch, Highwood Mountains, Montana, USA) 1 (49060639223).jpg 3,996 × 1,929; 4.91 MB
  
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  Sandstone-phonolite intrusive contact (Buck Ranch, Highwood Mountains, Montana, USA) 2 (49061149871).jpg 4,000 × 2,467; 6.78 MB