### Question
What is the definition of deep saline formation?


### Answer
The definition of **deep saline formation** is as follows in *42 U.S.C. § 7403*:

> a formation of subsurface geographically extensive sedimentary rock layers saturated with waters or brines that have a high total dissolved solids content and that are below the depth where carbon dioxide can exist in the formation as a supercritical fluid

#### Citation:
  - *42 U.S.C. § 7403*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Part A-Air Quality and Emission Limitations**

