 The watershed has no oil or conventional natural gas fields . However , a potentially large source of natural gas is the Marcellus shale , which lies 1 @.@ 5 to 2 @.@ 0 miles ( 2 @.@ 4 to 3 @.@ 2 km ) below the surface here and stretches from New York through Pennsylvania to Ohio and West Virginia . Estimates of the total natural gas in the black shale from the Devonian period range from 168 to 516 trillion cubic feet ( 4 @.@ 76 to 14 @.@ 6 trillion m3 ) , with at least 10 percent considered recoverable . 
 The watershed <a href='got' title='1'><mark>has</mark></a> no oil or conventional natural gas fields . However , a potentially large source of natural gas <a href='drop_aux' title='2'><mark>is</mark></a>the Marcellus shale , which <a href='uninflect' title='3'><mark>lies</mark></a> 1 @.@ 5 to 2 @.@ 0 miles ( 2 @.@ 4 to 3 @.@ 2 km ) below the surface here and <a href='uninflect' title='4'><mark>stretches</mark></a> from New York through Pennsylvania to Ohio and West Virginia . Estimates of the total natural gas in the black shale from the Devonian period range from 168 to 516 trillion cubic feet ( 4 @.@ 76 to 14 @.@ 6 trillion m3 ) , with at least 10 percent considered recoverable . 
The watershed got no oil or conventional natural gas fields . However , a potentially large source of natural gas the Marcellus shale , which lie 1 @.@ 5 to 2 @.@ 0 miles ( 2 @.@ 4 to 3 @.@ 2 km ) below the surface heaa and stretch from New York thru Pennsylvania to Ohio and West Virginia . Estimates of the total natural gas in da black shale from tdaDevonian period range from 168 to 516 trillion cubic feet ( 4 @.@ 76 to 14 @.@ 6 trillion m3 ) , w/ at least 10 percent considered recoverable .