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cngodles

I’ve been air scribing this piece out and I figured it was a Mooreoceras. However, the ridge going up the front is something I haven’t seen on this species. Is it just squashed a bit? It’s a pointed oval in shape.

 

The length is nearly 3 inches.

 

53BAD17B-B59A-401A-B1AA-16E74BBA8CC6.jpeg

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0B14B392-BAE5-42CB-9359-72675E0BD83A.jpeg

30B84FC5-8847-43C8-94E7-CEAC2FC89F49.jpeg

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cngodles

A couple photos from much earlier.

 

7DD06233-2271-4EFB-A4AD-C9305CDC47E8.jpeg

9057D298-22F2-4F2C-85C6-A81B87C5432C.jpeg

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cngodles

A Mooreoceras I found with completely smooth sides. However this was all steinkern.

2E06092A-D1DC-470F-A52E-F19B4DBD9335.jpeg

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FossilDAWG

The "line" up the side makes me think of the siphuncle in Bactrites.  One or two of your photos also suggest a conularid to me, but the ornament does not seem right and a conularid would be square in cross section, not a pointed oval.  So, assuming this is a nautiloid (can you see chambers?), I'd go with Bactrites.

 

Don

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KCMOfossil

This looks similar to something I find in the Kansas City Group, Pennsylvanian.  Perhaps Pteronites.  But, I'm not at all sure it is the same.  In fact, I'm not sure mine, pictured below, is Pteronites.  Perhaps others will chime in.  

On 5/12/2019 at 8:05 AM, FossilDAWG said:

The "line" up the side makes me think of the siphuncle in Bactrites

This looks like a good possibility.  

 

Russ

 

Here are some photos:

front.thumb.jpg.99e1edddf41fb03b206e42115935c146.jpgside.thumb.jpg.92c96b7094031489e96a1161131eb534.jpgtop.thumb.jpg.096b177e4ddf43cf880a2a7430a1ae59.jpg

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cngodles

I do have a solid example of Pteronites:

 

https://fossil.15656.com/2019/04/04/pteronites/

 

They are sea pens. The ID came from someone very familiar with local fossils.

 

I spent more time removing the matrix and took some close up photos of the ridge.

ED412423-F130-4368-83B4-CD6FE975E0A4.jpeg

D69C8F54-AC0D-4919-9154-883E377A4B8D.jpeg

D50F87BC-D9BC-43BC-BBFE-32AAFCDF5654.jpeg

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cngodles

3A0AEC47-D253-4A87-9373-F98DBE01FF58.jpeg

04F3DB81-BFD2-4F00-A768-DEED5229C71C.jpeg

AC8ACE9B-DEB2-49D4-9032-141F740D7941.jpeg

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cngodles

And one last one.

BDA6D09B-82D3-4373-B430-DA6928DF811D.jpeg

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KCMOfossil

Great pictures!  

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cngodles
16 hours ago, KCMOfossil said:

Perhaps Pteronites.

That being said, I've stumped my local geology expert for now and he also suggested it could be a sea pen. He is usually really quick to ID things, so now I'm even more lost.

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cngodles

In exploring the sea pen angle, I did find this shell online (American Museum of Natural History on Twitter). The ridge up the middle feels familiar on the right specimen.

 

But I also can’t get past the top cross section. The back portion of the top view was chipped. It was connected so the whole thing appeared to be one continuous oval. I don’t think a sea pen would be continuous.

C4E6A5A9-67E7-4DF9-8516-5ADE115B70BD.jpeg

2BECF094-AE29-4CE4-80C9-47ADC9EC837E.jpeg

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KCMOfossil
13 hours ago, cngodles said:

 

2BECF094-AE29-4CE4-80C9-47ADC9EC837E.jpeg

My specimen is oval on the end much like yours pictured here.  I'll try to get a photo up this afternoon.

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cngodles

My expert got back to me and he believes it fully to be a sea pen. I have lots of information to digest.

 

Apparently the generic name changed from Pteronites to Aviculipinna. More on this as I get it.

 

@KCMOfossil - Thank you!

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cngodles

So it's a sea pen, this much I know. Are we talking about Aviculopinna sp. or Aviculopinna peracuta? Perhaps even Meekopinna? I'm no expert on sea pens, so I'm open to suggestions. I have found two good enough sea pens previously here. I'm attaching photos of those to this post.

 

Also, I was told the microscope photo of the prismatic shell layer was exceptional.

 

 image.png.a177984d34e7c463c25dfa4749055ed4.png 

seapen2.jpg

seapen1.jpg

seapen1b.jpg

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KCMOfossil

Can't help with the more specific ID.  Hopefully others will chime in.

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