Boulder Park and McNeil Canyon Haystack Rocks
National Natural Landmark
Photo of Boulder Park and McNeil Canyon Haystack Rocks
Boulder Park and McNeil Canyon Haystack Rocks is composed of two adjacent sites that together contain the greatest concentration and most illustrative examples of glacial erratics (large glacier-transported boulders) in the Columbia Plateau biophysiographic province. As the visible products of dynamic glacier processes, they provide important evidence for the direction of movement and location of glacier ice on the Columbia Plateau during the last glaciation. Due to the lack of vegetation in this area, these sites are also probably the most illustrative examples of glacial erratics in the United States. Ownership: State, private.
DESIGNATION DATE
1986