Mr. Corbett then read a paper on the “Glacial & Post Glacial Geology of Doncaster.”

The lecture, which was illustrated by lantern slide, some prepared by Mr. Bellamy from maps & diagrams by the lecturer, others lent by Pro. Kendall, attempted to account for the presence of the different rocks in the Balby Till, & for the distribution of the different post-glacial gravels, etc. in the immediate vicinity of Doncaster.

The chief ice-invasion was supposed to have come from the N.E. & to have been composed of Lake District rocks from the Stainmoor Pass route, together with Scottish & possibly Scandinavian rocks. The sheet on its S.W. course had swept the remains of the Yorkshire Dales, with their Carboniferous rocks westward as far as Balby. Lancashire route rocks have probably been picked up from the Calder Moraine.

The post-glacial gravels were accounted for on the assumption of a great Humber (?) Glacial Lake in the Trent & York Vales with an outlet in the time of the great thaw by the Trent & Humber.