Abstract

Sir Kingsley Dunham: Professor Bott's gravity study has contributed materially to the understanding of NW England. The light it throws on the nature of the Pennine fault-system shows that the importance of the compressional inner faults, first brought out by F. W. Shotton, is even greater than was supposed. It is gratifying to have a model which is able to accommodate the Whin Sill and thus to explain the pebbles in the Lower Brockram, the first of which was found by Arthur Holmes. He wished to ask Professor Bott three questions: (1) how significant is the position of the base of the granite batholith, shown on the model as at about 9 km depth over the larger part of the Lake District, but at 6 km plus at Skiddaw, and would greater or somewhat lesser depths invalidate the model? (2) Does the survey throw any further light on the sub-Carboniferous structure of S Cumberland and Furness? (3) Does the postulated link between the Lake District and Weardale batholiths pass beneath the exposed part of the Cross Fell Inlier?

Mr I. C. Burgess asked Professor Bott if the “granite ridge” anomaly in the Vale of Eden could be accounted for by the presence of very thick Carboniferous Basement Beds?

He then commented: Much new stratigraphical and structural information on the development of the Pennine Line was obtained during the resurvey of the Cross Fell area by the Institute of Geological Sciences; this is summarized in the guide (Burgess, I. C.

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