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Global Warming...
That’s pretty cool. Digging on your property. Find something weird. Scratch your head..., but don’t feel so stupid after it’s determined to be 22,500 years old.
I’m a little surprised to find that there are caves in Minnesota. I always thought that caves were generally found south of the furthest advance of glaciers.
22,500 years ago was during the Last Glacial Maximum (LGM) and one of the coldest times during the Ice Age.
btt
Caver? Spelunker!