here’s another company that calls niobara a big play
Noble Energy calls niobara top tier oil play.
http://www.ogj.com/articles/print/vol-110/issue-12b/general-interest/noble-energy-calls-niobrara-top-tier-oil-play.html
Looks like a formation in Okalahoma called scoop also has oil 500 feet deep.
http://www.reuters.com/article/2013/10/18/shale-usa-idUSL6N0I819G20131018