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Maquoketa, Ordovician Unknown

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I was checking out my photos this evening and came across this "unknown" from a recent hunt in NE Iowa. The geology is Ordovician/ Maquoketa.  The "fossil" was found with only the surface of #1 showing. It looked a bit sponge like to me. I tried splitting the surface off and found the left over rock had a surface shown in 2. I further split the rock into pieces 3, 4, 5, and 6. As you can see, the unknown flares out again at 6. This is probably "just a rock" but tis better to ask first.





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Bryozoans commonly look like this when only partially preserved. Frequently there is a layer at the surface which gives the identification.

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