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Volcanic breccia from Gallatin Range, Montana. This rock formed due to a protracted series of volcanic mudflows (lahars) that blanketed this region (southern Montana and northwestern Wyoming) during the Eocence. Similar rocks can be seen in the Lamar Valley of Yellowstone National Park, in the Tom Miner Basin near Gard...
View Northwest from Humboldt Road near Butte Meadows. This is the canyon of Big Chico Creek. highway 32 runs across the bottom of the canyon about 30 miles east of Chico. Mount Lassen is on the right side of the photo, and Mount Shasta is in the center. To the left, Iron Mountain is visible as a small cone-shaped Butt...