Elk Basin is a valley on the border of Montana and Wyoming in the United States.
It is an active oil field with hundreds of derricks operating in it.
Geologically, it is a breached anticline formed by a deep subsurface thrust fault.
[1] As the rock strata in the basin are mostly exposed and relatively easy to identify, Elk Basin has long been used as a place for geology students to learn to practice geologic mapping.
Often mapping classes are supported by the Yellowstone Bighorn Research Association,[2] located in Red Lodge, Montana.