A Fossiliferous Limestone associated with Ingletonian Beds at Horton-in-Ribblesdale, Yorkshire

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Abstract
T he oldest rocks of the Ribble valley have long been known in the area around Horton, and they have always been considered a continuation of the larger outcrop near Ingleton. The earlier writers included these beds as part of the ‘green slates and porphyry’ series, while in later times the name ‘Ingletonian’ has been given to this group of hard, green, felspathic grits and roughly-cleaved green mudstones. Opinions regarding the age of the Ingletonian fall into two groups. A. Sedgwick (1852, p. 35) , the officers of the Geological Survey ( Dakyns & others, 1890, p. 10 ), T. McKenny Hughes (1867, p. 253 & 1902, pp. 323, 328) , and, in more recent years, Mr. J. F. N. Green (1917, pp. 95-7) claimed that the Ingletonian belongs to some part of the Ordovician sequence— either to the Borrowdale Volcanic Series or to the beds which should come between the volcanics and the Coniston Limestone Series; while the other view, held by W. T. Aveline (in Goodchild, 1892, p. 299 ), Prof. J. E. Marr (1892, p. 104) , and Dr. R. H. Rastall (1906, p. 99) correlates the Ingletonian with some part of the Pre-Cambrian, such as the Longmyndian. The evidence for holding one view or the other rested mainly on the lithological characters of the rocks. In the main exposure near Ingleton there are continuous sections in the valley for several miles, but near Horton only isolated exposures occur in the river bed and in and near the great quarry at Horton station. The

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