Very Large Unusual Agatized Fossil...Any Ideas What it is?

[Rattlehead]

I found this giant in Lake Michigan today in South Haven, MI area. It seems to be similar to agatized sponges I've found in material, but not in look. I think this ones pretty cool. Haven't cut into it yet...Any ideas what it is?

 

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[vpnavy]

Geeez, gives me the creeps. I remember watching a horror movie as a kid and I know this was the head of that darn monster that scared the crap out of me Rattlehead.

 

[Eu_citzen]

If it is a chalcedony it looks more jasper-ish to me. Not sure on fossil, isn't there a dedicated forum for fossils? ask there.