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The boundary between the western Jurassic-Cretaceous arc terrane and the eastern, pre-Cretaceous cratonally derived metasedimentary rocks extends along the axis of the Peninsular Ranges. In the southern Sierra Calamajue (lat. 29°25′N), where this boundary is exposed, detailed stratigraphic and structural analyses of these lower greenschist grade rocks indicate that the western and eastern terranes are structurally interleaved in a 5- to 7-km-wide zone. Five northwest-trending tectonostratigraphic units are mapped in this area. The structurally lowest (southwesternmost) unit consists of 1,300 m of chert and fine-grained clastic rock, with minor limestone of Late Mississippian age. These rocks are structurally overlain by...

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