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Some Relatively Heart Shaped Fossil Gastropods or Bivalves? In Phosphatic Nodules ( Missouri )


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Location is in Missouri

The area is dated to the Pennsylvanian 

Formation: Iola limestone formation

Subformation: Muncie Creek Shale Member 

Hello and happy valentines day :b_love1:! I was re-examining my old collection of Muncie creek shale nodules and found these peculiar specimens

 

Originally I posted an image of one of my larger heart shaped fossils in my member's albumwhere someone mentioned it could be some sort of bellerophontid gastropod but now that I found a second more complete specimen I think it was time to ask fossil ID to get more eyes and possible identifications. 

 

 

 

Specimen #1: My newest specimen and one I found to be heart shaped :b_love1:

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This specimen also has some weird sphere like structures beneath it so I took more up close images of it

 

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For this specimen there are no other parts of this nodule as I found it fragmented. 

 

 

Specimen #2: (2.3cm) My largest one and the one possibly identified as a bellerophontid gastropod

 

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Size comparison between this specimen and the smaller specimen 

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Specimen #3: I think this is just a regular old brachiopod or bivalve but I just wanted a confirmation on such! (The individual is 6mm long)

 

It also died near some fish remains 

 

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Both halves of the nodule

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Right side of the nodule

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fifbrindacier

Hi, on the photo that shows what has been identified as a bellerofontid i see some kind of bivalve, but i don't now well enough the fauna of the Iola limestone Formation

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2 hours ago, fifbrindacier said:

Hi, on the photo that shows what has been identified as a bellerofontid i see some kind of bivalve, but i don't now well enough the fauna of the Iola limestone Formation

I was not sure either as I originally called it a brachiopod and later someone suggested it could be a bellerofontid and in all honesty it looks more like a bivalve but no idea what it would be as I have never seen this species before

 

Nevertheless I have found a bellerofontid in some of the Iola but never in a nodule,

here is a few pictures of one a few months ago and I think it is Pharkidontus sp.

 

 

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