Do a search on Bakken Shale, Barnett Shale, Woodford Shale, Fayetteville Shale. Hottest plays in the US at the moment.
You left out the Marcellus shale in the north east it holds the potential to be as big or larger than the Barnet shale for natural gas here in the DFW area. Exciting times to be a Geologist. We talk about the Bakken, and the Barnet all the time in my Structural Geology class. these shales are classic examples of tight source rocks which until recently the technology to artificiality fracture and stimulate these reservoirs was not economical at <$25 bbl, now with oil north of $50 for the foreseeable future all these plays, NG is >6 Mcf which makes tight gas profitable hence the push for the Barnett, Marcellus plays.