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Geology of Mount Shasta

Figure 22

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Figure 22: Aerial view of Black Butte from the southwest. Black Butte is a complex of four hornblende-dacite domes that stand atop a vent just east of Interstate 5 midway between Weed and Mount Shasta City. The oldest dome is low on the left in this photo, and the top of the youngest forms Black Butte's summit. The flanks of the domes are mantled by an apron of talus, and only their tops are visible as rocky peaks.

 

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