On the Lower Silurian Rocks of the Isle of Man

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Abstract
The rocks which belong to the lower sedimentary series, and which occupy the largest portion of the surface of the Isle of Man, have been described by Dr. Berger, and supplemental observations have been made to his memoir by Professor Henslow. The Rev. J. G. Cumming has also given a description of the old rocks of the Isle of Man, with especial reference to the Carboniferous Limestone of the island. The older sedimentary rocks of the Isle of Man are also described in Glover's Guide to this island, which gives a condensed statement of the memoirs of Dr. Berger and Professor Henslow. The nature and arrangement of the old rocks of the Isle of Man are best seen in the coast-sections, which usually occur in the form of bold cliffs. The interior of the island also affords sections in some of the brook-courses; but the mountains composed of these rocks, which have usually a rounded outline, are covered to a considerable thickness with soil and peat, which hide the rocky masses. On the south-east side of the island, in the neighbourhood of Douglas, good exposures of rocks are seen. Along the coast from Douglas to about a mile north-east thereof, the strata appear in the Douglas to about a mile north-east thereof, the strata appear in the form of thin-bedded grey flags, having the mineral characters of the Skiddaw slate, and dipping south-east at an angle of 60°. These thin-bedded strata, on passing downwards, become thicker-bedded.The rocks here are used

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