must go to the millstone grit in its undenuded or partially denuded state, as it occurs beneath the coal-measures of Little Wenlock, or at the bend of the road, called “The Turn,” in going from Coalbrookdale to Wellington. The first thing striking the attention is a buff coloured shale, weathered on the surface to clay, at the base of the bold bluff cliff of gritty sandstone so conspicuous on the brow of the hill. Whilst examining this member of the Silurian series a man from a neighbouring cottage remarked, “That is fuller’s earth; persons fetch it when they are galled, and it is good for the eyes; large quantities are fetched away and sent to Manchester.” The fossils it contains show that it belongs to the lowest member of the Ludlow group, and that the whole of the Aymestry and Upper Ludlow have been stripped off and washed away before either the millstone grit or the coal-measures were formed. Among the fossils yielded by this shale, in addition to bivalves and corals, are those interesting forms of crustaceans called pen fossils, from their resemblance to a quill pen. The species we found was Graptolithus priodon, described in the early works of Murchison as Graptolithus Ludensis. The trilobites, from the fineness of the material, are so sharply and beautifully preserved that the visual organs of the little creatures are clearly discernible, even to the optical tubes, elongated cones, or crystaline lens such as are to be seen so marvellously distinct on the eyes of the dragon-fly of the present day. The beautiful markings too on the shield of these wondrous little creatures which flourished in these seas, in such numbers that they may be got out in groups—forms which died out and perished before the close of the carboniferous formation represented above it—are so delicate and fine as to equal if not to defy imitation in ordinary materials in use at the Dale Works; and it is we fancy at least worth the experiment whether with this shale reduced to powder it might not be made to produce delicate impressions after the example here set by nature. We also found here some beautiful Lingula, a Patella, an Orbicula, a Leptæna, a Lituites, a Fienestella, and other fossils. To inhabitants of the Dale, here is a field of research open which they may make their own, close to their own doors. This fine earth is known by various names where it occurs in Shropshire and the adjoining county of Herefordshire. In the latter county it is said to be used by country people for cleansing purposes, in which case it is called “Walker’s earth or soap.”