Abstract

The detailed study of a megascopic fold in the southern Laramie Range of Wyoming demonstrated that the prominent foliation present in the metamorphic series is not preserved sedimentary layering [but is result of transposition of pre-existing planar anisotropy]. This is so in spite of the fact that the map units are of approximately equal thickness and are continuous over significant distances within the mapped area. Furthermore, an intimate relationship between one of the fine grained foliated metamorphic rock units and a pegmatite of similar mineral paragenesis suggests derivation of the latter from the former by recrystallization controlled by the structure and by the mineral association of the rock type involved.

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