### Question
How is the term marker well defined?


### Answer
The term **marker well** is defined in *15 U.S.C. § 3301* as the following:

> any well from which natural gas was produced in commercial quantities at any time after January 1, 1970, and before April 20, 1977

#### Citation:
  - *15 U.S.C. § 3301*
  - Heading: **CHAPTER 60-NATURAL GAS POLICY**

