Abstract
THE “Summaries of Progress” issued by the Geological Survey of Great Britain are not by any means dry official reports, but contain a number of results, available for general use, which otherwise might remain unknown for several years. One of the chief features of the Summary for 1910, issued in June, 1911 (price 1s. 6d.), is W. B. Wright's account of the district round Loch Ba in Mull. This is accompanied by a map and sections, one of the latter (p. 36) showing the immense number of inclined intrusive sheets of basic rock that penetrate the “hybrid” mass of gabbro invaded by granophyre on the slope of Glen Forsa. On p. 39 it is mentioned that G. W. Lee's work in Morvern has led to the detection of two new localities for Cainozoic sediments among the basalts. The thin Cainozoic coals of southern Mull are discussed on p. 40. Carboniferous strata have received attention in Denbighshire and Warwickshire, where the observations are certain to have a considerable economic bearing, since these areas have not previously been mapped on the six-inch scale. In Appendix iii. (p. 80), R. G. Carruthers describes a mass of Lower Cretaceous sandstone, associated with fossiliferous Cainozoic clay and Boulder-clay, which rests on Old Red Sandstone in the heart of Caithness. This huge block, in which a quarry 160 yards long has been opened, has been investigated with the aid of borings, for the expense of which a grant was made by the Royal Society—whether of London or Edinburgh is not stated. The results show that the mass is an erratic brought in by the North Sea ice, and we become impressed by this further evidence of the wide extension of marine Cretaceous strata between Scandinavia and Britain in former times.
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C., G. Memoirs of the Geological Survey . Nature 89, 229–230 (1912). https://doi.org/10.1038/089229a0
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DOI: https://doi.org/10.1038/089229a0