Coal                                   

  Oil                 

  Gas                 

890,102,696

bbl

251,320,785

bbl

563, 291,057

bbl

10,000,000-

100,000,000

bbl

1,000,000-

10,000,000

bbl

Less Than

1,000,0000

bbl

More Than 5,000,000,000

mcf

 2,500,000,000-

5,000,000,000

mcf

 1,000,000,000-

2,500,000,000

mcf

10,000,000-

100,000,000

mcf

100,000,000-

1,000,000,000

mcf

Less Than

10,000,000

mcf

Colorado Stratigraphy