[thackney]

Depending on how much detail you want, other sources of info:

https://www.dmr.nd.gov/ndgs/bakken/bakkenthree.asp

http://www.rrc.state.tx.us/eagleford/index.php

[GSWarrior]

Thanks. I grew in western Colorado so I am very interested the subject. Center for American West, although not a conservative group, has done a good job of documenting the history of oil shale in the Piceance Basin.