The Highest Silurian Rocks of the Ludlow District

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Abstract
I. Introduction and Bibliography The Ludlow district has been regarded as classic ground since the days of Murchison, and, although it has been much neglected by the geologists of more recent times, local collectors of fossils have placed in the Ludlow Museum a collection which is probably unsurpassed for its excellence in illustrating the geology of the neighbourhood. Many papers were written upon the district by Murchison and others of his time; but, with the exception of Miss Wood's paper on the Lower Ludlow Shales, there has been no revision of its geology since their day: and we are of opinion that the area presents many features of interest, both structurally and otherwise, which can only be brought out by more recent methods of research. In the Ludlow-Downtown district there exists an interesting series of rocks, limited by the Aymestry Limestone at their base and the Old Red Sandstone at their summit, and it is with these that the present paper deals. Lithologically, they present a varied series of sediments, ranging from limestones on the one hand, through calcareous flagstones and shales, to shallow-water sandstones on the other; and these lithological changes are associated with certain changes in the fauna. Palæontologically, these rocks are characterized by the presence of Eurypteridæ, which, although rare in the lower beds, gradually increase in importance until they attain their maximum development in the beds immediately underlying the Old Red Sandstone. The rich brachiopod-fauna characteristic of the lower beds dwindles and almost dies out with

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