These sequences rest on a volcanoclastic and plutonic

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Unformatted text preview: . These sequences rest on a volcanoclastic, and plutonic basement of Triassic-Jurassic age. Syntectonic sedimentation, Late Cretaceous Stratigraphic pinchouts occur in two sandstone units of Campanian age: the sandy member of the Nivel de Lutitas y Arenas, and the sandy member of the Nivel Intermedio. Pinchouts on two sandstone units of Campanian age were interpreted to record mild uplift during the early Campanian along the northern, northeast-trending segments of two of the major faults of the Piedras-Girardot foldbelt, and along the easternmost (also northeast-trending) structure of 425 this foldbelt. These coarse-grained marine clastic units represent gentle deformation within the Piedras-Girardot foldbelt during the early and late Campanian (~84 and ~ 74 Ma). Although uplift took place, no major unconformities were developed at this time, as overlying units rest apparently in conformity with syntectonic units below. Since bedding geometry remained mostly parallel, it is unlikely that the faults propagated to the surface at this time....
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