Mount Bailey, Oregon

Mount Bailey (8,363 feet, 2,549 meters) is the southernmost volcano in a north-south-trending volcanic chain 6 miles (10 kilometers) long that rises west of Diamond Lake. Mount Bailey is about the same age as Diamond Peak, 27 miles (43 kilometers) north. Like Diamond Peak, Mount Bailey consists of a tephra cone surrounded by basaltic andesite lava. Bailey is slightly smaller 2.0-2.2 cubic miles (8-9 cubic kilometers) than Diamond Peak, and minor andesite erupted from the summit cone in its late stages, whereas Diamond Peak eruptions were never more siliceous than basaltic andesite.