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At 100 Ma, about midway through the history of the emplacement of the northern part of Peninsular Ranges batholith, a regional-scale deformation zone1 developed that juxtaposed two major prebatholithic units. Deformation occurred as subduction transitioned from beneath oceanic crust to beneath continental crust. The deformation zone is well exposed at Searl Ridge, where the intensity of deformation attendant to the juxtaposition of the two prebatholithic units progressively increased from west to east over a distance of 5.5 km. In this 5.5-km-wide zone, a series of three progressive structural transpositions is recorded in the metasedimentary rocks. Many outcrops have two...

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