| Popis: |
The occurrence of rocks containing typical Silurian fossils at several places near Cardiff, and over an area mapped as Old Red Sandstone by the Geological Survey, was first brought to my notice by my friends Captain J. Carne Ross, F.G.S., and Mr. W. H. Harris, of Cardiff. This was in the autumn of 1875; and as I was then commencing a stay of six months at Cardiff, I was able to accompany my friends to the sections they had discovered, and to confirm their observations. Mr. Ross and myself then devoted ourselves to a careful study of the neighbourhood, with the intention of writing a joint paper on the subject; but when we had made a considerable advance in our work, Mr. Ross removed to a distant part of the country, and I was left (much to my regret) to complete the paper without his aid. My friends Messrs. R. Jones and T. Jones, F.G.S., both of Newport, and Messrs. W. H. Harris and J. Storrie, of Cardiff, came, however, to my assistance; and to them I am indebted for many valuable suggestions and for the clearing-up of many doubtful and difficult points. History . The whole of the district I am about to describe is coloured as Old Red Sandstone on the maps of the Geological Survey; but that Silurian rocks exist at Pen-y-lan hill and in its neighbourhood was made known so long ago as 1861 by Norman Glass*, who collected a number of fossils from the Pen-y-lan quarry |
