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Caleb

Chew On This Maquoketa Mystery

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Caleb

It's not often I come across something in my stomping grounds that I can't at least ID down to a common name, but this one has me stumped.

Maquoketa Formation

Upper Ordovician (Richmondian)

Northeast Iowa

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Caleb

Side Views

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piranha

The first thing that pops up on my radar is the upper Ordovician sponge: Brachiospongia. The Treatise details a geographical range of Kentucky, Ohio, Tennessee and up north as far as Ontario. In any event my vote is sponge with radially arranged blade-like expansions emanating from a funnel edge (central cone).

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squalicorax

I was thinking sponge too. Sure is a weird one if it is what piranha speaks of. Does it have an detail in cross section after you cut it?

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Caleb

Huh, very interesting I shall have to research Brachiospongia. I was thinking something like sponge or some wierd algae colony. I'm not sure if it will have any detail in cross section as it has been replaced by chert.

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Caleb

I'm inclined to agree with the ID Brachiospongia. After a quick google search I found a 50min. lecture about Brachiospongia on YouTube.

. At first I was a bit hesitant to go with a sponge due to it's very large size, but according to the specimens in the lecture it's now a very compelling ID.

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thanatocoenosis

The first thing that pops up on my radar is the upper Ordovician sponge: Brachiospongia. The Treatise details a geographical range of Kentucky, Ohio, Tennessee and up north as far as Ontario.

Yep. They are one of the more rare fossils from the Ord of Ky. IIRC, they all come from one member of one formation. I've seen some get up to about 15 inches in diameter.

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Herb

I agree also with the sponge.

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