I found this on Sunday, Oct. 2, 2022, open, in the Mazon River. I am wondering if it is a fiddlehead, or "birth-of-a-fern" It came from an area of the creek where the concretions seem to be heavy, and iron laden, so I am concerned that it may eventually disintegrate from "pyrite " disease, so I wanted to share it while it still exists! Any help will be appreciated. Thank you!