Withrow Moraine and Jameson Lake Drumlin Field

National Natural Landmark

IN BRIEF
Withrow Moraine and Jameson Lake Drumlin Field contains the best examples of drumlins and the most illustrative segment of the only Pleistocene terminal moraine in the Columbia Plateau biophysiographic province. Both features together provide readily observable evidence of the large-scale depositional and erosional processes that accompany continental glaciation. They are also the only such glacial features in the world to show a clear geological relationship to catastrophic flooding, which occurred prior to the last advance of the ice sheet. Ownership: Private.

DESIGNATION DATE
1986