Rare Fossilized Fern or Palm from Colorado

This is an amazing piece of Fossilized Fern or Palm from Colorado. It's very rare and we are not sure what type it is, but it's the only one we've seen like this. It has amazing webbing pattern with fantastic depth. You can get lost looking at it. It's definitely unique and has a great polish. One of a kind. 
Measurements are about: 4 1/2 inches x 3 inches on the polished face x 1 3/4 inch thick, weighs 12.8 oz.