Basin folios which compile computerized well data, updated biannually, serve as a ready reference in the event of a new discovery.

Folios are available for the following basins: Appalachian, Arkoma, Black Warrior, Denver-Julesburg, Bend-Fort Worth-Strawn, South Georgia-North Florida, Great Basin and Range, Green River, Overthrust, Powder River, San Juan, Williston, and Lower Great Lakes.

In each folio is a list of exploratory wells with basic information and geologic tops, including a statistical analysis of formations penetrated in the basin. Additional statistics include the discovery-success percentage and hydrocarbon shows tabulated by formation name. An index map shows the states and counties included in the geologic province accompanied by a computer-posted and contoured map to represent the productive horizon of the basin. A thickness or structural datum corrected to sea level is given with each control point.

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