Boulder Park, National Natural Landmark in Douglas County, Washington, United States
Boulder Park is a National Natural Landmark on the Waterville Plateau where large granodiorite and gneiss boulders dominate the landscape. These rocks were carried here by glaciers and now create distinctive formations across the terrain.
The site marks where an ice sheet from the north stopped advancing about 17.000 years ago, leaving behind its rocky cargo. This endpoint shows how far glaciers pushed into the region during the last Ice Age.
The geological features of Boulder Park provide researchers and students with direct evidence of glacial processes during the last Ice Age.
You can walk through the park on trails that wind between the boulders scattered across open ground. The flat terrain makes navigation straightforward, though sturdy footwear helps with the uneven surface.
The park displays two distinct types of rock formations side by side, including boulders dropped by glaciers and naturally formed tower-like rocks. This combination in one place tells the story of different geological processes happening together.
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