There was nothing in the appearance of the watercourse to indicate that the river had not flowed there a few years previously; in some parts, beds of sand and gravel were spread out; in others, the solid rock had been worn into a broad channel, which in one spot was about 40 yards in breadth and 8 feet deep.

It is self-evident that a person following up the course of a stream will always ascend at a greater or less inclination: Mr.Gill, therefore, was much astonished, when walking up the bed of this ancient river, to find himself suddenly going down hill.

He imagined that the downward slope had a fall of about 40 or 50 feet perpendicular.

We here have unequivocal evidence that a ridge had been uplifted right across the old bed of a stream.

From the moment the river-course was thus arched, the water must necessarily have been thrown back, and a new channel formed.