REMARKS: Pennsylvania's largest lake; 938 acres.
REMARKS: One of the largest kames in the state; this glacial deposit marks the location of a depression filled with sand and gravel in or at the margin of stagnant ice as the glacier melted. At present a portion of the kame is being quarried for gravel.
REFERENCES: Shepps, V. C. [1962], Pennsylvania and the Ice Age, Pennsylvania Geological Survey, 4th ser., Educational Series 6, 33 p.
REMARKS: One of the largest marshes in Pennsylvania, contained in an ancient stream channel that was filled with glacial till during the last glaciation in Pennsylvania. The American bald eagle nests in the marsh and the rare bog turtle has been reported. 5. Rock Creek Ravine, at Custards in Greenwood Township, contains a series of scenic waterfalls.
REMARKS: The most outstanding topographic example of a terminal moraine in western Pennsylvania. This moraine marks a "dead" or stagnant position of the ice front during the Great Ice Age in Pennsylvania. The topography on the moraine is particularly hummocky due to the presence of unsorted rock materials that were pushed or carried there by the glacier.