These videos were taken at one of my favorite spots in the entire state of Michigan. I don't know of another place like it but would love to hear if anyone is aware of a similar phenomenon in another location around Michigan. Amazing stuff to share with family!
My mom knew of this substance from exploring around the state park when she was young. My brother and I discovered, with some great friends: the Stieve boys, that it could be worked into a fine slop! We camped all over Michigan with the Stieves. So, the clay pits were created by us about 25 years ago when I was around my son's age who you will see in the first video.
Great times!