paleontology
Indiana invertebrate fossil

I thought it was a bullet at first glance, but now it looks like a mushroom fossil. Further looking tells me that mushrooms don't fossilize so have no clue what it is.

Bottom view of the Indiana fossil.

The area it was found is known for sea life, but I know it is not a shell due to the gills on the underside of the fossil, also it is not thick enough for supporting a shell.

Fossil Collector: Mark S.
Location: Hendricks County, Indiana.

[Possibly it is indeed a shell fossil. Some bivalves are very thin when alive and even thick ones can become compressed flat over time as a fossil. A coral fossil is another possibility. Is there an Indiana fossil collector help us to identify this fossil find? Please leave a comment.]

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4 Responses to “Hendricks County Fossil”

  1. Josh says:

    I think it’s a brachiopod (a hinged shell that one had a small animal inside).

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  2. Riley says:

    Were you at Big Brook/Ramanessin? I am a fossil hunter who frequents that area and just yesterday I found something very similar that seemed to be, impossibly, a mushroom. It is identical to yours except for with a bit more detail towards the inside.

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  3. Riley says:

    I believe it is coral Heliophyllum.

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  4. Gregg Elkins says:

    My son found one of these as well in Hendricks county. Any consensus on what this is? Thanks

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