Hello everyone! Here is a fossil that I need help to identify. Yesterday I found this strange waffle-like impression in this piece of sandstone, while I was walking in the woods in the Saginaw area of Michigan. I know that the fossils that are found in Michigan are mainly from Silurian, Devonian, and Carboniferous period strata. This stone was laying in an old rock pile, that was deposited by farmers who plowed their fields. The stone is 5 1/8" x 3 1/8", and the impression itself stretches 3 1/2" across the rock. The small dark brown cube next to the stone is clay that I rolled over the Impression to make a positive cast of the fossil. From this positive, I can tell that the fossil has a snake skin pattern surface. This could've been an impression of some sort of marine or terrestrial plant, I have some ideas of what the fossil could be, but I need your help to identify and confirm what species this was. I hope these photographs are helpful, and feel free to ask for better pictures of the stone.