On the Classification of the Fossiliferous Slates of Cumberland, Westmoreland and Lancashire (being a Supplement to a paper read to the Society, March 12, 1845)

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Abstract
Introduction.—An abstract of my former memoir on this subject having been published in the first volume of the Geological Journal*, I am spared the necessity of entering on many details by way of introduction. Since however the subject before me is one of great complexity, I may be permitted to enumerate the results I before arrived at, and to illustrate them by sections. The general section through the great Cumbrian cluster of mountains gives us three distinct groups of slate rocks. III. Upper system of slates, with a few calcareous bands full of fossils, the whole deposit more or less fossiliferous. II. Green roofing slate and contemporaneous porphyry, &c. I. Skiddaw slate, the lower part of which is metamorphic. The superficial extent of these three groups is represented on the maps of Cumberland and Westmoreland which I have had the honour to present to the Society, and the lowermost (I .) has no exact parallel in Wales. The one marked II. is put on the parallel of the Snowdonian slates, but in Cumbria contains no fossils. The next (I I I .) commences with beds of the age of the Caradoc sandstone, and ends with rocks obviously of the age of the Upper Ludlow rocks and tilestone of the Silurian system: it therefore includes the whole or nearly the whole of that system. The subdivisions of this great physical group (I I I .) were described in detail in the paper just alluded to, and were in the following order

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