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fhopson: Bread crust bomb, Lassen May 15 1915 dacite
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fhopson: Bread crust bomb, Lassen Park
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fhopson: Flow banding in rhyodacite of King's Creek, Lassen Volcanic National Park, CA
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fhopson: Volcanic bomb, Lassen Volcanic National Park
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fhopson: Grand Canyon of the Yellowstone River, Yellowstone National Park
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fhopson: Fantastic Lava Beds, Lassen Volcanic National Park
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fhopson: Blue Dragon Lava flow, Craters of the Moon National Monument
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fhopson: Columnar joint rosette in Bishop Tuff, Owens River Gorge
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fhopson: Devils Postpile at Devils Postpile National Monument, CA
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fhopson: Devils Postpile at Devils Postple National Monument, CA
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fhopson: Bishop Tuff, Owens River Gorge, eastern California
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fhopson: Fiamme in welded Bates Mountain ashflow tuff near Hickison Summit, central Nevada
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fhopson: Pillow basalt at Port San Luis, CA
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fhopson: Port San Luis pillow basalts
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fhopson: Blue Ridge Rhyolite-Tuscan Formation
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fhopson: Rockland tephra
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fhopson: Colonnade and entablature
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fhopson: Vesicles in the Hat Creek Basalt
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fhopson: Ropey lava flow surface in Hat Creek Basalt, northeastern California
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fhopson: Bishop Tuff tephra and ashflow tuff at Chalfant Quarry near Bishop, CA
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fhopson: Bishop Tuff at Chalfant Quarry near Bishop, CA
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fhopson: Tuff breccia in Mehrten Formation near Malakoff Diggins State Park, CA
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fhopson: Fiamme in Bishop Tuff in Owens River Gorge near Mammoth Lakes, CA
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fhopson: Fiamme and hornfels clasts in Bishop Tuff in Owens River Gorge near Mammoth Lakes, CA.