Abstract
FOLLOWING the president's address, which has already appeared in these pages, Dr. Marr gave an address on the geology of Cambridgeshire. He described the main physical features of the county, and showed their relations to geological structure. Opportunities were afforded during the meeting, by afternoon excursions, for visiting most of the typical sections of Jurassic and Cretaceous rocks exposed near Cambridge, including the interesting occurrence of Upper Gault at Barnwell, in which Mr. Fearnsides recently discovered an unsuspected fauna. The Boulder-clays and gravels which cover a large portion of the surface of Cambridgeshire were dealt with by Dr. Marr in his address, and were further described by Messrs. Fearnsides and Rastall, who gave an account of the boulders collected by the members of the Sedgwick Club. Mr. F. W. Harmer, in a comprehensive paper on the-Great Eastern Glacier, showed that its product, the Chalky Boulder-clay, extending over a great part of the eastern counties, has a palmate form, its lobes radiating from the great depression of the Lincolnshire and Cambridgeshire fens. The fens were the centre whence the Chalky Boulder-clay was distributed, and formed the quarry out of which was excavated the enormous mass Of Jurassic material which forms the matrix of this deposit.
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LOMAS, J. GEOLOGY AT THE BRITISH ASSOCIATION . Nature 70, 517–519 (1904). https://doi.org/10.1038/070517a0
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DOI: https://doi.org/10.1038/070517a0