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Mazon Creek Identification Help; Odds and Ends


Thomas.Dodson

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Thomas.Dodson

Hi all,

I've been working on the pit 11 concretions I collected this summer and some difficult identifications have piled up. These might not be preserved enough to be identifiable but they seem preserved decently enough that some people might have a better idea for identification. Any help is appreciated. Measurements are the lengths of the fossil and not the concretion.

 

The first fossil measures 30 mm across. This seems like it's probably just a weird shrimp molt?

 

Fossil #2 measures 15 mm across. I don't hold out much hope for this one as it's rather broken up and lacks detail but it superficially resembles a Dithyrocaris sp. carapace.

 

Fossil #3 is quite possibly not a fossil at all but the texture and color difference in the concretion is distinct enough to consider the possibility. It is 20 mm tall and 15 mm wide at widest point.

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Thomas.Dodson

This fossil measures 25 mm tall from the tip of the longest projection.

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I would agree that the first specimen is a shrimp molt

#2 might be a seed (hard to tell from the pictures)

#3 I believe this is likely a small section of a rare algae named Thallites dichopleurus

#4 is a shrimp tail (likely Acanthotelson)

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Thomas.Dodson

@RCFossils Very nice, thanks!

 

Have you ever seen an Acanthotelson that big before? I noted the similarity to Acanthotelson when I was trying to find it out earlier but all the specimens I saw were quite small. The tail alone is 25 mm.

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Yes,

It is rare but Acanthotelson can get quite large.

Here is a similar example from my collection for comparison.

72D0F48D-48E3-4205-A20C-FB6A3CBE3DE7.jpeg

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