If it's just staining, then yes, what's happened here is that it was sitting in a pile of coins in a chemically hostile environment - like a pool or fountain - for a while.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
Looks like a small coin sat atop this dollar in a hostile environment. They may have been stuck together by soda residue or another sticky substance. Try a soak in pure acetone to see if it cleans up.
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