Us oil shale deposits map
The U.S. Energy Information Administration provides an interactive map showing the major tight oil and shale gas plays in the lower 48 states. Tight oil and shale gas are two of the main types of "unconventional" oil and gas resources, and played an important role in the early-21st-century resurgence in domestic production of oil (beginning around 2009) and natural gas (beginning around 2006). 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.