Under Detroit, There’s a Huge, Active Mine (Here's How It Works)

For more than 100 years, the Detroit salt mine has been pulling millions of tons of rock salt out of the ground. But considering Michigan is surrounded by fresh water... where did all that salt come from?

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Key sources I used to research this video:
The info pamphlet I show toward the start
http://detroitsalt.com/
https://pubs.geoscienceworld.org/gsa/...
https://project.geo.msu.edu/geogmich/...
https://www.loc.gov/item/2016816919/
https://digitalcollections.detroitpub...
https://pubs.usgs.gov/periodicals/mcs...
https://home.wgnhs.wisc.edu/wisconsin...
https://project.geo.msu.edu/geogmich/...
https://www.michigan.gov/-/media/Proj...
https://www.osha.gov/hydrogen-sulfide/
https://www.mlive.com/news/detroit/20...
https://www.nationalgeographic.com/sc...
http://maps-detroit.com/detroit-salt-...
https://onemine.org/documents/detroit...
https://www.clickondetroit.com/featur...
https://books.google.com/books?hl=en&...
https://project.geo.msu.edu/geogmich/...
https://deepblue.lib.umich.edu/bitstr...

Image credit:
https://commons.wikimedia.org/wiki/Fi...