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Castle Crags
Castle Crags is a dramatic and well-known rock formation in Northern California. Elevations range from along the Sacramento River near the base of the crags, to over at the summit of the tallest crag.
Located just west of Interstate 5, between the towns of Castella and Dunsmuir, Castle Crags is today a popular tourist stop along the highway.
==Geology==
Although the mountains of Northern California consist largely of rocks of volcanic and sedimentary origin, granite bodies (plutons) intruded many parts of the area during the Jurassic period. Heavy glaciation at this location during the Pleistocene eroded much of the softer surrounding rock leaving the towering crags and spires exposed, from which the Castle Crags pluton derives its name. Exfoliation of huge, convex slabs of granite yielded rounded forms such as the prominent Castle Dome feature of Castle Crags.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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