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I think this is the genus Antiquatonia, but I’m looking for some confirmation. I found this back in April, going through my finds and trying to ID.

 

Found in Limestone. Glenshaw Formation (Conemaugh Group)

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Have you compared to Juresania, Linoproductus, or Cancrinella ?

LINK  page 10

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Nice, a local research paper I don’t think I’ve seen yet. :thumbsu: They even included specimens from my county. Can’t wait to read it.


If I go by the fossil plate, Lino appears to be a longer shell. I have found representative examples of that genus in the past. The dip in the median plane and the ribs being prominent along it rather than growth lines has me thinking more Antiquatonia.


I’ll look up Cancrinella

 

However, I’m open to opinions.

 

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These genera are defined largely based on the location of spines on the shell.  It's hard to determine that from your photos as it seems the exterior surface is missing.  The general aspect seems more like Juresania than Antiquatonia to me, based on my collection from New Mexico, but without specimens showing where spines were attached I can't be confident or any ID.  Productids are one of the harder groups of brachiopods to identify.  Why do you think they are Antiquatonia?

 

Don

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Yeah, I did notice that. The productida ones have them. I have this photo of one I took (Not this specimen). I’ll never see one pulling it from limestone I imagine.

 

The negative part has a lot of preserved aragonite, however I’m not sure I still have it. Even so, I probably wouldn’t see the spines if they were there.

 

 

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On 1/26/2020 at 1:22 PM, KingSepron said:

@Max-fossils i think is something he’d know

Heh, I may be decent with bivalves, but brachiopods are waaaay out of my league. 

Maybe @Tidgy's Dad can help too?

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I would agree there isn't enough detail to be able to give a certain id, but I would also lean towards Juresania based on shape, size and ribbing. 

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  • 2 years later...
cngodles
Posted (edited)

One last look at this one. I have settled on Antiquatonia portlockiana.

 

Scale bar = 1 cm.

 

79A20275-B90A-4257-9D2E-2AD038DADB4F.jpe

Edited by cngodles
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