This report describes a case history in a densely drilled, but spatially restricted, area (47 km2) containing 240 wells in the Mioceno Norte Area of Lake Maracaibo, Venezuela. There, by means of seismic sedimentology, we extended a genetic-stratigraphic-unit-level (15 to 50 m) facies interpretation to a larger, sparsely drilled 3-D survey area (300 km2).

This full-color, oversize map, designed for hikers in the park, describes geologic units and features. The text documents the geologic history of the Big Bend Ranch State Park area. Support was provided by the Texas Parks and Wildlife Department and the U.S. Geological Survey.