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Allodon

Pennsylvanian Fossil ID

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Allodon

Hi everybody, I was wondering if you could help me with this. I found this rock among the Ames Limestone around Pittsburgh. The limestone's chock full of crinoids and corals, but I wasn't sure what this fragment was. It looks like it might be from a cephalopod (belemnites or bactrites maybe?), but I'm really not positive. Could you guys help me out here?

 

Thanks!

 

IMG_3679.jpg.0c1ef5c9e008e98421be42081eb87f46.jpgIMG_3673.jpg.664756f046a8e779173dc3a6ddbd163d.jpgIMG_3674.jpg.b69d37684a16f5e527193eed1c52c690.jpgIMG_3676.jpg.594e496cdd8f2b2d47670ea2defc3061.jpgIMG_3677.jpg.5b84fac0e4c014deaa9f1601730eca77.jpgIMG_3678.jpg.184ceec62257b8c594f6031e6a15340b.jpg

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Tidgy's Dad

Yes, I think you're on the right lines with orthoconic nautiloid. :)

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Allodon

Awesome! Thanks! 
 

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JamieLynn

second the Cephalopod! 

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historianmichael

My guess is that it is a heavily weathered cross section of a crinoid stem. I believe I see other crinoid columnals on the block.

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connorp
4 minutes ago, historianmichael said:

My guess is that it is a heavily weathered cross section of a crinoid stem. I believe I see other crinoid columnals on the block.

This is what I was about to say as well.

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Thomas.Dodson

Can we get close-up pictures of the fossil and pictures of the edges of the narrow sides (if possible)? It might help decide between an orthocone cephalopod and a worn/distorted crinoid columnal section.

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Allodon

Hey guys, thanks for the responses.

 

I'm gonna try to remove it from the rock if I can, so I'll send pictures after that if I'm successful. There definitely are pieces of crinoid in the rock around it, but the slight trapezoidal shape seemed off for a crinoid to me. I've attached are the best pictures of the edges I could get as it is. (The zig-zag pattern between a few of the segments is now also making me think it might just be a really weathered crinoid segment)

IMG_3683.jpg.08a3edc1a73dffe77031b692a61853ca.jpgIMG_3682.jpg.452f93a3468a3246d7618bb434073107.jpgIMG_3684.jpg.414a78354618de3686d68ee542be62c6.jpg 

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rwise

Looks like crinoid is the answer.......more on the same plate

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BobWill

The slight taper is what makes it look more like a nautiloid but the close-ups reveal the crenella. The taper is probably because it got crushed on one end.

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