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The provenance of middle Permian to Maastrichtian sandstones from the subsurface of the Marañon and Ucayali Basins was determined through U-Pb dating of 113 detrital zircon samples from 21 hydrocarbon exploration wells. An additional 52 samples representing many of the subsurface lithostratigraphic units drilled in the Marañon and Ucayali Basins were collected from 42 outcrop localities in the Huallaga Basin and one outcrop locality in the Pachitea sub-Basin for U-Pb dating. The exposed units were analyzed to determine whether the outcrop sandstones had the same provenance as their subsurface counterparts.

Analytical results show that profound temporal changes in long-term...

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