|This article is part of the FrackSwarm coverage of fracking.|
The Mancos shale is a Late Cretaceous geologic formation of the Western United States, located in New Mexico and Colorado, dominated by mudrock that accumulated in offshore and marine environments of the Cretaceous Western Interior Seaway. The Mancos was deposited during the Cenomanian through Campanian Age (geology) approximately from 95 Ma to 80 Ma. The Mancos Shale was first described by Cross and Purington in 1899 and was named for exposures near the town of Mancos, Colorado. 
Natural gas exploration
It's been reported that Encana Corporation "plans will run two to four rigs to drill up to 50 wells in 2014 on 176,000 leased acres in the Mancos Shale [in New Mexico] ... The company will spend $350 million in the Mancos Shale in 2014."
Additionally, the company would be exploring for oil in southwestern Colorado's portion of the Mancos Shale. Encana will be exploring for natural gas as well as oil in both New Mexico and Colorado.
- Cross, W. and Purington, C. W. (1899) "Description of the Telluride quadrangle, Colorado" United States Geological Survey Atlas, Folio 57
- Weimer, R. J. (1960) "Upper Cretaceous Stratigraphy, Rocky Mountain Area" American Association of Petroleum Geologists Bulletin 44: pp. 1-20
- "Could the Mancos Shale be the next big thing? Encana says yes" Nicholas Sakelaris, Dallas Business Journal, April 10, 2014.
- "Industry touts major Mancos Shale play" Emery Cowan, The Durango Herald, March 18, 2013.