A small but lively stream, called Paddy's River, runs at the bottom of this pass, and immediately to the S.W.of it, an open forest country of granite base extends for many miles, on which the eucalyptus manifera is prevalent, and which affords the best grazing tracts in Argyle.

At Goulburn Plains, however, a vein of limestone occurs, which is evidently connected with that forming the ShoalHaven Gully, which is perhaps the most remarkable geological feature in the colony of New South Wales.

It is a deep chasm of about a quarter of a mile in breadth, and 1200 feet in depth.

The country on either side is perfectly level, so much so that the traveller approaches almost to its very brink before he is aware of his being near so singular an abyss.

A small rivulet flows through the Gully, and discharges itself into the sea at ShoalHaven; but this river is hardly perceptible, from the summit of the cliffs forming the sides of the Gully, which are of the boldest and most precipitous character.