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Mystery Ordovician Fossil (Graptolite?) - Fillmore Formation


Olenoides

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Here's a mystery fossil from the Lower Ordovician Fillmore Formation of Utah.  My initial impression is it must be a graptolite, but I've never seen any graptolites from this formation with this structure and I can't find any graptolites in my research that look like this.  The other thing that's throwing me off is the "rod" running down the middle is preserved actually fairly 3d where every graptolite I've seen is preserved as just a flat film.  For reference the specimen is about 2" tall including the middle section still covered in matrix.  Any ideas?

 

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that is cool, I have some 3D graptolites from the Ordovician of KY.

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Maybe it's a sponge, something in the line of Vauxia.

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Interesting...

There are graptolites preserved with some 3D as Herb point out (I have one but not from the Fillmore Fm), but on yours I don't see any theca as you would expect on a graptolite. I may be wrong. I like abyssunder's idea.

Do you think the item at the top is on the same plane as the bottom one, and the overlying layer could be removed to see more of each - maybe they connect under there? If I were you I'd want to get it prepped to find out.

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Yes, the two exposed areas of the fossil are on the same plane and I believe are connected.  Unfortunately I was never able to find the rock that connects in the lower half of the specimen.  I will get it prepared out more at some point.  

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