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Sheep Rock, located within the Payette National Forest, provides the best view of the horizontally layered lavas that represent successive flows on the Columbia River Basalt Plateau. The two contrasting series of volcanic rocks separated by a major unconformity provides an unobstructed view of an important geologic phenomenon.
Location: Adams County, ID
Year designated: 1976
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Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.
Last Updated: June 28, 2012