Plaesiomys subquadrata?

[Ballixxe]

This is a fossil my father found and gave to me when I was six or seven years old.   That was over 46 years ago...does that make me a fossil?

I think it's a Plaesiomys subquadrata, with a small trilobite on the bottom.

[Tidgy's Dad]

Do you know where it was found? 

Looks like a productid to me. 

 

[Ballixxe]

Near Mansfield, Ohio

[Ballixxe]

Looks like the center profile picture:

 

from https://www.fossilguy.com/sites/caesar-creek/caesar-creek-fossils.htm

 

 

Edited Saturday at 09:23 PM by Ballixxe

[Tidgy's Dad]

Could you take a photo directly down on the specimen, please? 

The beak should be prominent as in the image you copied and pasted or :

Edited Saturday at 09:45 PM by Tidgy's Dad

[Ballixxe]

Here it is!!

[minnbuckeye]

@Tidgy's Dad, Mansfield has Mississippian bedrock, if this helps.

[Tidgy's Dad]

1 hour ago, minnbuckeye said:

@Tidgy's Dad, Mansfield has Mississippian bedrock, if this helps.

Cheers, my friend, that makes sense. 

The shape is wrong for the subquadrate Plaesiomys subquadratus, the ribs don't bifurcate as they should and the beak is not exposed enough.

 

This is a productid brachiopod, classic shape and I can make out some spine bases too. 

[minnbuckeye]

@Ballixxe, knowing the geology of your area allows Adam to ID this brachiopod better. The examples you provided likely came from SW Ohio and represent brachiopods that are at least 100 million years older than the one your father gave you! Can we see a picture of the exposed trilobite. It is hard to see from the image provided.

 

Mike

[Ballixxe]

5 hours ago, minnbuckeye said:

@Ballixxe, knowing the geology of your area allows Adam to ID this brachiopod better. The examples you provided likely came from SW Ohio and represent brachiopods that are at least 100 million years older than the one your father gave you! Can we see a picture of the exposed trilobite. It is hard to see from the image provided.

 

Mike

 

[Ballixxe]

7 hours ago, Tidgy's Dad said:

Cheers, my friend, that makes sense. 

The shape is wrong for the subquadrate Plaesiomys subquadratus, the ribs don't bifurcate as they should and the beak is not exposed enough.

 

This is a productid brachiopod, classic shape and I can make out some spine bases too. 

 

Thanks so much!!   Genus is Productid, is there any way to speciate?

[Tidgy's Dad]

4 minutes ago, Ballixxe said:

 

Thanks so much!!   Genus is Productid, is there any way to speciate?

No, this brachiopod belongs to the suborder Productidina. 

I would need more information on the formation that it was found in to attempt to narrow it down. 

[minnbuckeye]

Thanks for the additional picture. I doubt that it is trilobite in origin but will not eliminate the possibility. Just not enough to give a definitive answer. 

[Sagebrush Steve]

It vaguely looks like a trilobite pygidium but by no means am I certain.