REMARKS: This is the southernmost glacial lake in the United States. Adjoining the lake are floating bog mats, and a research station that has classroom facilities. The site is a registered National Natural Landmark.
REMARKS: A series of red siltstones and gray sandstones (Catskill Formation, Devonian age) are exposed in massive cliffs formed by the Delaware River as it eroded through these rocks. From Hawks Nest (159) and other points along the top of the cliff there is a breathtaking view of the Delaware River Gorge (160). The gorge is wild and scenic from Matamoras north to the New York boundary. Waterfalls and springs are common along the gorge.
Six hundred feet west of the northeast corner of Pennsylvania is the first monument of granite marking the Pennsylvania-New York State boundary. The monument was erected in 1884.
REMARKS: A small, but picturesque, cliff of near-horizontal crossbedded sandstone (Catskill Formation, Duncannon Member, Devonian age); the 20-foot vertical face on the cliff is developed on a prominent joint (fracture) in the rocks.
REFERENCES: Sevon, W. D. [1975], Geology and mineral resources of the Tobyhanna and Buck Hill Falls quadrangles, Monroe County, Pennsylvania, Pennsylvania Geological Survey, 4th ser., Atlas 204ab.