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I'm not sure what sort'a rock that is but I can say ... it's not a skull. If it's biological, it's probably some type of plant. There is a large Paleo club on the east coast; the "Delaware Valley Paleontological Society" (I think). Someone there might be able to help.
Originally posted by beastamerica
or it's THE THING's left EGG.
Originally posted by WhiteWash
Yes...it's a rock with a plant fossil.
That's all it looks like to me.
Originally posted by groingrinder
It's a Crinoid fossile. Very common.
Originally posted by DamnedDirtyApes
This is a piece of Petoskey stone, which is fossilized coral. I can't tell you how many pieces of stone like this I have found around Michigan lakes and rivers.