Bentonite was discovered in Houston County in 1940 by a staff member of the Bureau of Economic Geology. On correlation of the sections in which the bentonite was exposed, namely, at Hurricane Bayou and Alabama Ferry, it was found that, though these localities were some 20 miles apart, the two sections were almost identical. This led to the obvious conclusion that the shale member containing the bentonite was continuous throughout the intervening area. Therefore, it was the work of this project to trace this shale member with its accompanying bentonite beds by means of outcrops, auger holes, and excavations. Surveys were made of the sites that encountered or exposed the bentonite, and the results were plotted on base maps made from aerial photographs.