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Abstract

Outcrop accessibility: extremely difficult Outcrop Coordinates: 50.7048°S, 72.7361°W Refer to outcrop 10 on location map

The Tres Pasos Formation (1000–1500 m thick) records the transition from bathyal water depths of the upper part of the Cerro Toro Formation to the shallow-marine and deltaic facies of the overlying Dorotea Formation. The lower part of the Tres Pasos Formation exposed at Cerro Divisadero (600 m thick) is the northernmost (most landward) of the Tres Pasos outcrop locations in this guidebook. Four sandstone-rich packages that range in thickness from 20 to 80 m are recognized and mapped across a ~3 km long outcrop transect. The north-south trending outcrop is generally parallel to depositional dip (basinward to the south), although ridge-and-gully topography provides three-dimensionality at a smaller scale (10s to 100s of meters). The four sandstone-rich units are separated by intervals of shale and siltstone tens of meters thick. Unit 1 is partially covered and minor post-depositional structure (reverse faults and associated drag folds) disrupt detailed architectural characterization of Unit 4. Units 2 and 3 are, therefore, the focus of the panels in this guidebook. Refer to Romans et al. (2008) for detailed presentation and interpretation of the Tres Pasos Formation at Cerro Divisadero.

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