The Crush-Conglomerates of the Isle of Man

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Abstract
Concluding Summary: The chief points brought forward in this paper may be epitomized as follows:— (i) In the Skiddaw Slates of the Isle of Man strata of considerable thickness have been locally broken up under shear-pressure, and re-arranged in the form of a crush-conglomerate or friction-breccia. (ii) This crush-conglomerate occurs in definite bands striking with the surrounding rocks, sometimes continuous for many miles. (iii) The brecciation has usually taken place along the junction of arenaceous with argillaceous strata, and has chiefly affected the passage-beds between such rocks. (iv) The formation of the crush-conglomerate has occupied one stage only in a series of earth-movements which had previously folded the rocks and afterwards impressed a shear-cleavage upon them. (v) There is reason to believe that the crush-conglomerate marks a definite stratigraphical horizon; and that it was originally dispersed in a rude zone which afterwards suffered contortion.

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