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Crazyhen

Unknown fossil (horseshoe crab, shell?)

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Crazyhen

This fossil is from Quqing of Yunnan, China. It measures 15x20cm.  Is it a horseshoe crab, shell or what?

B02F1311-A9BC-42DD-86E4-6F7A7E84AB90.jpeg

09F6FE38-D171-402A-8E68-D9E1D8AA854E.jpeg

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daves64

Looks like it may be a horseshoe crab, but I'm no expert. 

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RJB

  I dont know what it is, but I would sure love to go on the prep attack with this piece!  Looks very cool.

 

RB

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daves64

awww... you just saw the magic word....  "crab".

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Fossildude19

I don't think there is enough visible to be able to identify this. :unsure: 

 

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Innocentx

The first photo looks different from the second. Are these 2 examples you have posted?

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Crazyhen
5 minutes ago, Innocentx said:

The first photo looks different from the second. Are these 2 examples you have posted?

They are positive and negative plates of the same fossil.

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Bronzviking

The shape resembles the shell of a horseshoe crab but like the others said; not enough exposed to ID. Neat fossil though.

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abyssunder

What is the geological age of the sediment?

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Crazyhen
5 minutes ago, abyssunder said:

What is the geological age of the sediment?

Devonian

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abyssunder
3 minutes ago, Crazyhen said:

Devonian

Thank you.

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Crazyhen

Got more photos, see if these would help identify the specimen

B6FD311B-1371-4B44-8364-F5242E3CAB0F.jpeg

B367DA6E-0ED0-44E8-9409-F0ACDD2CF463.jpeg

A7768290-B3D1-4131-B2FE-B369C08323DD.jpeg

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Rockwood

I think horseshoe crab is out.

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Xiphactinus

Pretty sure that’s the remains of a brachiopod shell. Especially since it’s Devonian age. 

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Kane

It may be a bit too big for a brachiopod. :blink:

 

It may also be a coiled nautiloid living chamber steinkern. Pictured here is a similarly sized one I found, also from the Devonian.

IMG_5139.JPG

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Crazyhen

Another similar one just dug out from the fossil site.  Also a nautilus?

C5FD7DF1-9FD4-44F3-9802-1E3E60487E97.png

69516AF7-2EDC-4D0E-99F6-549AFC587133.png

030F4B33-3CC5-46D3-98DD-9F752333B155.jpeg

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abyssunder


Can we see the other side of the slab?

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Crazyhen
3 hours ago, abyssunder said:


Can we see the other side of the slab?

 

5A214145-34F1-45AF-8ED6-A44B5421D9D3.jpeg

5C3DC2C8-F927-48AA-AE3B-5C8E5B01287A.jpeg

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Wrangellian

Am I seeing some kind of carapace or shell material along the edge? If so, perhaps the two pieces could be reunited and prepped out from one side... that is if it is deemed to be possibly worthwhile.

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Innocentx

Yes, a close up the possible shell material might reveal ribbing or some other indicator.

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Crazyhen
21 minutes ago, Innocentx said:

Yes, a close up the possible shell material might reveal ribbing or some other indicator.

 

F5E88AEC-C56B-444F-9DCF-49F51354B51F.jpeg

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Wrangellian

It looks like something there, but I can't tell what. Need to see more...

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Crazyhen
2 hours ago, Wrangellian said:

It looks like something there, but I can't tell what. Need to see more...

 

B227BF6A-1570-4C02-8196-61CB9B736A1E.jpeg

4F9CD96F-2724-4273-92DD-57917C774C82.jpeg

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Ludwigia

I still wouldn't rule out horseshoe crab, although, as everyone here is remarking, it sure is hard to tell without it being properly exposed. Link

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Rockwood
20 minutes ago, Ludwigia said:

I still wouldn't rule out horseshoe crab, although, as everyone here is remarking, it sure is hard to tell without it being properly exposed. Link

This would be roughly ten times the size of what I can find reports of from the paleozoic. 

It also seems odd that the thinnest part of the shell would leave the best recorded shape while the thicker elements seem to be nearly completely unpreserved.

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