Geology & Soils

USGS Geological Map Database of the Conterminous United States (link) 
Geology data is available through the NRCS Geospatial Data Gateway.

Potentially P-Deficient Forest Soils (pdf)
East Texas located on the Beaumont, Lissie (Montgomery and Bentley), and Willis Geologic Terraces

Geology.xls
Spreadsheet relating geologic names for southern states.

Maps showing potential nutrient deficiencies in the Southeast
Description and access to data used to generate the following maps (pdf)
Alabama (pdf) | Georgia (pdf) | Louisiana (pdf) | Mississippi (pdf) | North Carolina (pdf) | South Carolina (pdf)
Metadata documentation from the USGS (note-new SMGC available as of 2017) (pdf)

Soil Survey information available from the USDA NRCS: Link to website

Soil and Silvicultural Treatment Response Charts (old soil system) (pdf)
FPC recommended prescriptions for established stands

Soil Texture and Drainage Classes of Common Forest Soils
Atlantic Coastal Plain (pdf) | Eastern Gulf Coastal Plain (pdf) | Western Gulf Coastal Plain (pdf)