In March 1874 I communicated to this Society a paper entitled, “On a Tremadoc area near the Wrekin in South Shropshire, with description of a new Fauna,” which was published in abstract in the Society's Journal, vol. xxx. p. 196. In that paper I described certain shales, commonly supposed to be Caradoc, which I had examined at Shineton, two miles S.S.W. of the Wrekin. In these shales I had found Conocoryphe, Lingulella , and other fossils of a Cambrian type; and from this and other evidence I had concluded the beds were of Tremadoc age. My views, however, were not accepted by the Fellows present at the reading of my paper, on account of the alleged imperfection of the fossil evidence; and, as I was at the time absent in America, I had no opportunity of defending my position. Since my return home I have collected more abundant and satisfactory evidence, both geological and palæontological, which I venture to think will establish my original conclusions. I have also made out some additional points of interest in the geology of the neighbourhood of the Wrekin. Previous Information. Sir R. Murchison has described the area under examination, from the Wrekin on the north-east to the May-Hill Sandstone at Kenley on the south-west, as composed of strata of Caradoc age, the Wrekin itself being an igneous outburst altering the Caradoc sandstone on its flanks into quartzite. The Geological Survey has followed Murchison, but has included, under the name of “quartzite,” certain sandstones in which