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A 118,535 km2 (45,750 mi2) area that encompasses the San Juan basin and surrounding structural features is contoured on the base of the Dakota Sandstone of Cretaceous age, using a 100-m (330-ft) contour interval at a scale of 1: 500, 000. Faults shown on the map are those that have been mapped at the surface. The structure contours were generated from compilations of structure contours and from large-scale original mapping; in areas of little or no surface data, the structure contours were generated from logs of drill holes.

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