Collier Cone, a cinder cone, at the north base of North Sister. Photo courtesy of the Oregon Department of Geology and Mineral Industries.
Collier Cone, a cinder cone, at the north base of North Sister. Photo courtesy of the Oregon Department of Geology and Mineral Industries.
译文：科利尔圆堆，一个煤渣堆，在三姐妹山北峰的北侧山脚。照片由俄勒冈州地矿局提供。