Abstract

Flyschlike upper Cretaceous sandstones and conglomerates of the Cerro Toro formation exposed in Chilean Patagonia exhibit current structures with north-to-south orientations, parallel to regional tectonic trends, but orientations of other structures such as flexures and contortions due to subaqueous slumping indicate an east-dipping paleoslope. The apparent discrepancy between current and slope directions can be reconciled by postulating lateral transport of sediment downslope from the west or northwest, perpendicular or oblique to tectonic trends, by gravity-controlled mechanisms such as mudflows, sliding, and turbidity currents, followed by deposition of the material by the action of longitudinal currents of considerable strength and at least moderate depth.

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