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Port, as it is familiarly called, the valley contracts to a rock-enclosed gorge, for here the Delaware emerges from its great canyon in the Catskill series of rocks, in the bottom of which it flows from Deposit, at the northern boundary of Pennsylvania, eighty-seven miles above. The remarkable change seen in the surrounding topography indicates the presence of a different rock formation from that passed below, and the river runs out of the Catskill rocks over the
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Saw-mill rift. For thirty miles above, to the northern line of Pike County, at Narrowsburg, the river banks mostly are only mere shelves a few rods wide, and frequently present nothing but the faces of rocky walls, rising perpendicularly from the water to a height of six hundred feet or more. From the expanding limestones below, the valley here suddenly contracts in the flags and ledges of the Catskill series. All the small streams coming from the bluffs back of the cliffs descend with rapid fall, and frequently over high cascades. These Catskill flags, built up in vast construction, rear their gaunt and weather-beaten jagged walls and wood-crowned turrets on high. Perched far up on the New York side, at the narrowest part of this remarkable gorge, is an eyrie called the
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Hawk's Nest,