Shale Plays, Lower 48
Source: Energy Info Agency http://www.eia.doe.gov/pub/oil_gas/natural_gas/analysis_publications/maps/map...
Marcellus Drill Sites in Western PA (as of 9/3/10)
Source: DEP/www.fractracker.org
Shale Depth Map in PA
Source: Marcellus Regional Shale Isopach, Engelder PSU, 2009
Dept. of Energy | Estimated Gas Reserves Western PA
[link] http://www.eia.doe.gov/pub/oil_gas/natural_gas/analysis_publications/maps/map...
Oil & Gas Leasing Activity in Allegheny County
Source: Uni. of Pittsburgh / UCSUR
Diagram of Shale (Reservior Rock) Formation
Source: PSU