Abstract
Last month I glanced at some of the difficulties attaching to the theory of a “ great submergence ” during Glacial times, particularly in connection with the deposition of this shelly clay at Clava.In regard to the alternative theory of transport by land-ice, the following facts may be enumerated as so far in its favour:-(a) Evidences of ice-action are conspicuous all over the district. It is a region of intense glaciation, and this special locality is right in the tract of the ancient ice-sheet.(b) The traces of the movement show that, with a very small submergence, the ice-sheet must have passed over part of a former sea-bottom.(c) That in this neighbourhood it rose in its progress, carrying numerous boulders with it in its course, and leaving them at higher elevations than their parent beds of rock.
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