On the Slate Rocks of Devon and Cornwall

After a painful interruption of three years, I resumed my geological work during the past summer, and revisited some portions of Devonshire and Cornwall, a small part of the typical Silurian country (of Sir R. I. Murchison), a part also of the Cambrian groups of North Wales, and lastly some groups of the newer fossiliferous slates of Westmoreland and Yorkshire. I rejoice to appear once more as a fellow-labourer, and to lay the first-fruits of my summer's task before the Geological Society. My present notice will be confined to Devonshire and Cornwall. It is well known to all who take any part in the working of our Society, that during the past year Sir R. I. Murchison, after an examination of certain fossils sent to him from Cornwall, has introduced some new colours into the geological maps of Cornwall and South Devon. Thus, he colours the great headlands, between the Bays of St. Austell and Falmouth, Lower Silurian . Again, he colours a considerable part of the coast in the neighbourhood of Looe, &c.. Upper Silurian ; and the same colour is extended to a portion of the slates of South Devon which skirt the north side of the metamorphic rocks of Bolt Head and Start Point.