Jump to content

cngodles

Recommended Posts

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

3CB83CD9-2EDB-43AE-A8E4-463E16B97D61.jpeg

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

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

Fossils of Parks Township - ResearchCatalog | How-to Make High-Contrast Photos

Link to comment
Share on other sites

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

  • I found this Informative 2
Link to comment
Share on other sites

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

Link to comment
Share on other sites

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

Fossils of Parks Township - ResearchCatalog | How-to Make High-Contrast Photos

Link to comment
Share on other sites

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.

Fossils of Parks Township - ResearchCatalog | How-to Make High-Contrast Photos

Link to comment
Share on other sites

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

Fossils of Parks Township - ResearchCatalog | How-to Make High-Contrast Photos

Link to comment
Share on other sites

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.

Link to comment
Share on other sites

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!

Fossils of Parks Township - ResearchCatalog | How-to Make High-Contrast Photos

Link to comment
Share on other sites

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

Fossils of Parks Township - ResearchCatalog | How-to Make High-Contrast Photos

Link to comment
Share on other sites

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

Link to comment
Share on other sites

  • 4 years later...

Just to correct previous information.

 

The Mooreoceras name used above is no longer valid. It would be Pseudorthoceras knoxense.
https://fossil.15656.com/catalog/specimen/CG-0006

 

After much debate, this specimen in this post turned out to be a Pinnid. It will have a new name in a few months, but it is awaiting publication. Here is a more recent photo of a similar specimen. The lines that I thought were cephalopod sutures were crush marks that commonly occur with pinnids found here in life position.

CG-0399-pinnid-0001b.jpg

  • Enjoyed 2

Fossils of Parks Township - ResearchCatalog | How-to Make High-Contrast Photos

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...