VIII.—Evidences of Ancient Glacier-dammed Lakes in the Cheviots

Extract

It is uncertain whether Cheviot itself was overridden by extraneous ice, but striæ on Thirl Moor and Baker Crag, recorded by the Geological Survey, probably indicate that that portion of the watershed was overridden by ice from the Tweed Valley, and Professor James Geikie mentions the occurrence of till and striated stones on the tops of the Cheviot Hills at 1,500 feet. The transport of erratics shows movement along both sides of the axis of the range from S.W. to N.E. at some stage of the glaciation. Across the northern end and for at least ten miles down the eastern side, however, a distribution of erratics from the Tweed Valley, together with other indications to be mentioned, points to an ice-flow veering round through easterly to a north to south direction. Our observations go to confirm the above conclusions with respect to the area north and east of Cheviot.