The USGS Energy Resources Program has studied oil shale resources of the United States, with a significant effort on the Eocene Green River Formation of Colorado, Utah, and Wyoming.
This formation contains the largest oil shale deposits in the world.
I’ve handled cores from explo wells in the GRB.
Lots of shale with layers of sandstone production rock.
Prime for fracking.
One core came in and was literally oozing crude from the sandstone layers.
Finally, green energy I can get behind.
And fossil teleostei!!!