The Corocoro fault apparently follows an angular unconformity between the younger Vetas formation on the west and the older Ramos formation (Tertiary) on the east. Both formations top west, so the fault does not lie close to the axial plane of an anticline, as previously believed. An unconformity along the Corocoro fault supports recent suggestions that the copper is partly syngenetic and partly diagenetic.

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First page of An unconformity in the Corocoro Basin, Bolivia, and its relation to copper mineralization
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