The Geology of the Country Around Kingsbridge and Salcombe
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A striking feature of the area in question is the contrast between the intensely folded but comparatively unaltered Devonian rocks in the north and the metamorphic rocks on the south. This has given rise to a somewhat extensive controversial literature which is referred to in the following pages and in which many facts of great importance are described.
The age of the schists is left undecided by the author, though more definite views on the subject have been expressed in favour of their antiquity by Professor Bonney and Miss Raisin, and in favour of their being metamorphosed Devonian rocks by Jukes and Holl, A. Somervail and A. R. Hunt. Although Mr. Ussher has not been able to settle the question of the age of the metamorphic rocks by stratigraphical evidence, his detailed mapping of the green schists and his careful description of the line which separates the altered from the unaltered rocks will be found of value to all future workers in the district.