http://www.usgs.gov/newsroom/article.asp?ID=1911

3 to 4.3 Billion Barrels of Technically Recoverable Oil Assessed in North Dakota and Montana’s Bakken Formation—25 Times More Than 1995 Estimate—
Released: 4/10/2008 2:25:36 PM

Contact Information:
U.S. Department of the Interior, U.S. Geological Survey
Office of Communication
119 National Center
Reston, VA 20192

Click on the link and read this article. Amazing find. Unbelievable!