[Rockhounds] Mazon Creek Fossil

[John Siebel]

Hi folks,

I'm looking for help in identifying a Mazon Creek (Illinois) fossil that I received from a fellow list member a while back (Thanks Steve!). It looks like it could be a shell imprint but than again possibly plant matter of some kind. The plate measures 7cm wide. I ain't no expert so any help is appreciated. View image at http://www.flickr.com/photos/31394106@N08/?saved=1

Thanks for your help - John
PS. I just noticed, under magnification, that the surface is peppered with tiny pyrite cubes. How cool!

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