Here’s a report from the Glenwood Springs Post Independent (John Colson). Click through and read the whole article. Here’s an excerpt:
Peter Barkmann, and environmental geologist and hydro-geologist for the Colorado Geological Survey, offered a primer on the deep geologic history of western Colorado in a presentation last week to the Northwest Colorado Oil and Gas Forum, which meets quarterly in Rifle. Barkmann described the formation of the Mesaverde and other energy-rich rock layers formed from coastal plains sediments deposited 75 million years ago…
The organic deposits of the seaway, laid down over eons, were covered by accumulating layers of rock and sediment. Buried deep underground, subjected to extreme pressure and heat, the organic materials gradually decomposed and permeated the surrounding rock, forming deposits of coal, oil, gas and oil shale.
More Colorado River basin coverage here.