Midwest:
* Michigan: The Michigan Basin contains significant deposits of rock salt, particularly in the Saginaw Formation. This salt is mined for road de-icing and other industrial uses.
* Ohio: The Ohio River Valley also has significant salt deposits, primarily in the Silurian Period. These deposits are mined for road salt and other industrial purposes.
* Illinois: While not as extensive as Michigan or Ohio, Illinois has some salt deposits, primarily in the Silurian and Devonian periods.
Southwest:
* New Mexico: The Permian Basin in New Mexico is known for its extensive salt deposits, which are associated with the Castile Formation. These deposits are mined for industrial uses and are also a source of brine for the production of potash.
* Texas: The Permian Basin extends into Texas, where it also holds substantial salt deposits.
* Arizona: Arizona has smaller salt deposits, primarily in the Triassic period.
Note: The formation of salt deposits is often associated with ancient seas and lakes that have dried up over time, leaving behind concentrated salt layers. The Midwest and Southwest have both experienced geological conditions that have led to the formation of these deposits.
