On some Mica-traps from the Kendal and Sedbergh Districts

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Abstract
Under the convenient generic term mica-trap the Geological Survey of England has included a group of rocks which are generally rich in that mineral, and occur among the older Palæozoic strata of the north-west of England. These rocks are found in dykes usually of no great thickness, and often very imperfectly exposed; and they have been mapped on quarter-sheet 98 N.E., and in the adjacent corners of the yet unpublished 98 S.E. and 97 S.W. A brief notice of the dykes is also given in the accompanying memoirs, ‘Kirkby Lonsdale,’ p. 42, and ‘Kendal and Sedbergh,’ p. 16. Without microscopic examination and chemical analysis, it was not possible, as a rule, to attempt a more exact nomenclature, so that, in our opinion, the use of the term mica-trap, like felstone, greenstone, &c., is not only convenient, but justifiable, where for any reason a more exact investigation is not practicable at the time. The present paper, although very far from being a complete history of all the mica-traps of North-western England, may form, it is hoped, a first chapter in it, and be the means of evoking further contributions to the lithology of this interesting and not very common group of rocks.

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