This was found in Cayuga Ontario (Devonian) in 1988 and is still marked in my collection as an unknown. I have had a number of suggestions over the years as to what it is but nothing that screams that's it for sure. I always thought that it was echinoderm of some type but others have suggested eurypterid. Any thoughts. It was found at surface level of an abandoned water filled quarry so there is no assurance that it actually originated at that quarry but it probably did as it looked like the same matrix as the surrounding rock.
Please jump in with your thoughts... I would really like to figure out what it is as I have nothing else that remotely looks like this