Fossil or Not?

Fossil or Not?

fossilI found this buried in the backyard while mowing, Kasey did the initial excavation. It’s oddly shaped, and has crusty things all over the surface, so I’ve been trying to figure out what it is most of the evening. The question is whether it’s a fossil or not. More to come, in the meantime if you know what you are talking about and have a hypothesis as to what it could be, I’m interested in your opinion. For an idea of scale the grey curved line is the outline of a large burner on a ceramic stovetop, the words say “turbo boil”. I’ll get some more pics tomorrow with a ruler for scale. I’m in the NE Corner of Kansas, surface rock here is Carboniferous for the most part.