Union Peak – Prominent Geological Features of Crater Lake National Park
The southwest corner of the park is occupied by a dissected volcanic cone that culminates in the sharp pinnacle of Union Peak at an elevation of 7698 feet. Even though the flanks of the volcano have been deeply excavated by glaciers, it is easy to imagine the original form, for the attitude of the lavas is clearly displayed on the radiating ridges that separate the cirques. The volcano became extinct either before Mount Mazama began to develop or shortly thereafter …. [The Union Peak Volcano, The Geology of Crater Lake National Park, Oregon (1942), Howell Williams]
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