664 Proceedings of the Royal Society 
where Captain Burke states he noticed a horizontal terrace on both 
sides of the river, at a height of 330 feet above the sea. It is 
marked (A) on plan, fig. 7, Plate II. 
The Convener recognised a terrace on the right bank at 338 feet, but 
he could see none on the opposite or left bank. At a little distance 
farther up, there are on the left bank gravel knolls at a somewhat 
higher level. At this place, the channel of the river is about 40 feet 
below the terrace, and is of rock, which has of course prevented 
any deeper cutting of the drift beds. 
At the junction between Glen Beg and Glen Rossdale (B) in the 
plan, there are very large knolls of detritus with flattened tops. 
From the highest of these knolls, the Convener, on looking across 
the valley in a direction by compass E. by N., descried a terrace, con- 
tinuous for about 80 yards, and apparently horizontal. Its position 
is indicated on the plan by five small vertical strokes. When the spirit- 
level was turned in a direction about E. by S., it struck on another 
horizontal terrace, about half a mile distant. All these flats are at 
one height, viz., 528 feet above the sea. 
Higher up Glen Rossdale on the left bank, and at a spot about 
1 J mile from (B), there is an extensive flat, which had been marked 
by Captain Burke. He states it at 750 feet above the sea. The 
Convener made it 760 feet. When a person is on the terrace, it is 
not distinctly traceable for more than 300 or 400 yards ; but when 
viewed from the opposite side of the valley, at a distance of about 
a quarter of mile, it can be distinctly traced for more than a mile 
continuously ; and at its east end it is seen to cross the ridge which 
divides Glen Beg from Glen Rossdale. 
In a higher part of Glen Rossdale, and still on the left side of 
the glen, the Convener observed traces of a shelf at 853 feet, with a 
steep slope or bank below it of about 30 feet in height. The Ord- 
nance surveyors observed traces of a horizontal terrace still higher, 
viz., at 1500 feet above the sea. The Convener, looking in that 
direction, observed, at a distance of about 3 miles, something like a 
horizontal line running for nearly a mile continuously at what might 
be about that height. 
On the plan, Captain Burke indicates as existing in adjoining 
glens, traces of the 330 feet terrace by the cypher 0. These glens 
the Convener had not time to visit. 
