This is the "Fossil Friday" post #174. Expect this to be a somewhat regular feature of the website. We will post any fossil pictures you send in to [email protected]. Please include a short description or story. Check the #FossilFriday Twitter hash tag for contributions from around the world!
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Mazon Creek concretions come in many shapes and sizes. Quite often, the shape of a concretion is a clue to what type of fossil might be inside. The Pit 11 concretion shown below has a shape that is usually an Essexella asherae, which is a very common fossil from Pit 11. However, that oval shape has been known to yield a nice shrimp.
The concretion opened after cycling for a couple months to reveal a nondescript jellyfish.
However, there was a crack that in one half. Removing the cupped out piece...
.... Showed there was a shrimp under the jelly!
It's not the best shrimp and it's only a partial, but it leaves me wondering how many jellies have nice fish, insects, tullies, and spiders hidden underneath?!?
