While studying the sandstone dikes accompanying the great fault of Ute pass in the summer of 1896, my attention was naturally attracted to the contact between the granite and the overlying sedimentary rocks, which, as every geological visitor to the region must know, is admirably exposed in the district immediately north of Manitou, on both sides of Ute pass. I was deeply impressed, as would be any student of New England geology, by the wonderful clearness and continuity of the exposures, but more especially by the almost absolutely plane form of the contact thus disclosed, and having since enjoyed an opportunity to make a more particular examination of this contact, I am more than ever convinced that it represents a type of erosion unconformity which, although probably of frequent and widespread occurrence in nature, is somewhat unique in geological literature, or at least has not received hitherto the attention . . .

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