The Chattanooga Shale is a natural gas reservoir located in Tennessee. Many companies have been drilling here and striking lots of natural gas. The Chattanooga Shale extends into the following states: Georgia, Tennessee, Alabama, Kentucky.
You can find more on the Chattanooga Shale at the following website, which includes a map of the shale and other shale plays in the USA
http://www.oilshalegas.com/chattanoogashale.html