Geological Data Services has correlated formation tops data and well spots in the Permian Basin, Oklahoma Area, Western Kansas, Denver-Julesburg Basin, Green River Basin and San Juan Basin. The correlated formation tops data files utilize all available well logs, are correlated to an extensive network of loop-tied cross-sections and include a broad range of correlated tops. The data files are constantly updated as new logs are released. Data can be purchased on a per-well basis, for areas ranging from a single township to an entire basin.