The Marcellus Shale formation in Pennsylvania is becoming a major force in the natural gas world, and a recent report from Moody's sees it as having the most potential for producers there. While the report points to several companies that are well positioned to take advantage of the Marcellus, there were two glaring omissions that investors should look at if investing in this shale play: Cabot Oil & Gas (NYSE:COG) and Range Resources (NYSE:RRC).

Not only do Cabot and Range have much more riding on the success of the Marcellus than Moody's picks -- which are Chesapeake Energy (NYSE:CHK), Southwestern Energy (NYSE:SWN), and Anadarko Petroleum (NYSE: APC) if you were curious -- they make for more compelling guys. Find out what gives Cabot and Range an advantage in the Marcellus and why they are compelling buys.