The U.S. Geological Survey estimates a mean of 40 million pounds of in-place uranium oxide remaining as potential undiscovered resources in the Southern High Plains region of Texas, New Mexico, and Oklahoma.The uranium occurs in a type of rock formation called “calcrete,” which has been well-documented in noted uranium-producing countries like Australia and Namibia. The calcrete formations described in this assessment are the first uranium-bearing calcrete deposits reported in the United States.