The Unconformity in the Coal-Measures of the Shropshire Coalfields

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Abstract
This unconformity, locally known as the Symon ‘Fault,’ has received so much attention from geologists in the past, that it would almost seem superfluous to attempt any new study of the subject. So far back as 1861 it was brought by the late Marcus Scott before the notice of the Geolgical Society 1 in a very valuable paper, of the facts contained in which I shall here make use, though my inferences will be somewhat different from his. In 1863, Mr. John Randall, in a joint paper with Mr. George E. Roberts, read by Sir Andrew Ramsay before the Geological Society, 2 showed that the same agency which created the Symon or Great East ‘Fault’ in the Coalbrookdale Coalfield had removed the whole of the older or lower beds of coal and accompanying seams of ironstone from the Devonian rocks several miles south of the above field, and that they had been replaced by two beds of inferior coal. Between the upper two of these seams was a bed of limestone containing Spirorbis carbonarius of sufficient thickness to repay burning for lime, the whole dipping apparently beneath the Bunter Sandstone, and reappearing in the same order, as Sir Roderick Murchison showed, a mile farther south at Cantern Bank and Tasley near Bridgnorth. Mr. Randall, in subsequent papers read before various scientific societies, and more particularly in his work on ‘The Severn Valley,’ published in 1882 (Madeley), showed that the same phenomenon of the Symon or Great East ‘Fault’ was observable all the

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