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Mazon Creek Unknown


connorp

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This is my first non-Essexella find so far. Or at least non-indistinguishable-blob find that is. That said, I have absolutely now idea what it is. It looks vaguely familiar but I can’t put my finger on it. I hope the pictures are decent enough, if not I can try again. I uploaded some with a contrast boost as some of the details are faint.

 

64924AEB-BCAA-4C3A-9A53-D328F53C0144.thumb.jpeg.2d45c2fb386a3b8cd1e2e8798642249a.jpeg

8B1166E1-8971-4B69-8FD2-53BA887AB8E2.thumb.jpeg.50907cc19dae10e404311b8aaa0cd3dd.jpeg

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Looks like there’s some kind of appendage, and what could be an eye stalk on the smaller half (right half in most pictures). But I’ve probably just been spending too much time with my Cambrian arthropods :zzzzscratchchin: 

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Fossildude19

This looks like a coprolite, to me.  :shrug:

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deutscheben

It looks to me like an Achistrum sea cucumber, albeit a pretty faint one. 

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5 hours ago, deutscheben said:

It looks to me like an Achistrum sea cucumber, albeit a pretty faint one. 

Thanks for putting me down this rabbit hole. Looked more into similar fossils possibly IDed as such on the forum and I am thinking instead that it might instead be Coprinoscolex ellogimus. I thought so at first because of the stockier nature of my specimen, which did not seem to align with Achistrum very well. Here is an image from the original paper describing this species:

 

5d4db4845a30c_ScreenShot2019-08-09at12_57_56PM.thumb.png.425e6b05c5ca4b686a1a07519e8ead3a.png

 

My specimen looks very similar to B I think.

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5 hours ago, deutscheben said:

It looks to me like an Achistrum sea cucumber, albeit a pretty faint one. 

I would agree.

This is very likely a portion of a sea cucumber. It may also be a poorly preserved Coprinoscolex (spoon worm).

if you have a microscope, you should see J shaped structures. This would confirm that it is sea cucumber.

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28 minutes ago, RCFossils said:

I would agree.

This is very likely a portion of a sea cucumber. It may also be a poorly preserved Coprinoscolex (spoon worm).

if you have a microscope, you should see J shaped structures. This would confirm that it is sea cucumber.

When I'm back at school I'll check for these. Do you not think that there is a proboscis preserved?

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Mark Kmiecik

Sea cucumber sclerites most likely, small section, poorly preserved because of the coarse texture of the matrix. I believe that only a short segment of the creature is preserved here, be it cuke or worm.

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I also agree with a partial sea cucumber- nice find.

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  • 3 weeks later...
On 8/9/2019 at 2:01 PM, RCFossils said:

I would agree.

This is very likely a portion of a sea cucumber. It may also be a poorly preserved Coprinoscolex (spoon worm).

if you have a microscope, you should see J shaped structures. This would confirm that it is sea cucumber.

How large are the J shaped structures? Just looked at under my scope (albeit not a very good one) and saw nothing of the sort.

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Mark Kmiecik

I would label it MC fauna, indet. Worm or cuke, either way you'll end up with better, if you don't have one already.

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