[TXnMA]

This "gas play" is of personal interest:

Our land is just southwest of the point where the three state boundaries intersect (barely inside Texas).

Good basic info (incuding the above map) is available at http://geology.com/articles/haynesville-shale.shtml.

[TXnMA]

Hmmm... The geology.com website apparently prevents "hotlinking" to their (map) image from another website (FR). The map is viewable on their website...