USGS scientists are studying the stratigraphy and coal geochemistry of Gulf Coast coal-bearing intervals to better understand the region's resources. Planned results of the study include geologic and stratigraphic interpretations characterizing the coal and digital, geographical-referenced data bases that will include stratigraphic and geochemical information. Coal assessment study areas in Texas and Louisiana. The NAPP coverages can be useful in identifying areas that could be affected from potential oil spills along the Gulf Coast. The maps depict landscape features such as lakes and streams, highways and railroads, boundaries, and geographic names.
Contour lines depict the elevation and shape of terrain.
The maps are useful for civil engineering, land-use planning, resource monitoring, hiking, camping, exploring, and fishing expeditions. The map revisions for 1999 are shown in figure 6.