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Fossil from unknown Sandstone, near Casper, WY


Jaybot

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Visited Wyoming a few weeks ago (not for fossils).  I did however get to hunt some sandstone layer in between Alcova and Casper.  These seemed to be bedding planes with primarily shells (bivalves, etc).  I found after getting home this mystery fossil in one of the chunks I brought back.  My first thought was possibly a root to a tooth, but I know basically nothing on WY geology/stratigraphy.

So, what sandstone layer/formation was this, and what is this fossil?  
Thank you so much for the help y’all.  I’m like a fish out of water with stuff outside my home range. ;)

 

 

 

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-Jay

 

 

“The earth doesn't need new continents, but new men.”
― Jules Verne, Twenty Thousand Leagues Under the Sea

 

 

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1 minute ago, ynot said:

Looks barnicle to me.

I didn't consider that possibility, that may be it.  @jpc, what do you think?

-Jay

 

 

“The earth doesn't need new continents, but new men.”
― Jules Verne, Twenty Thousand Leagues Under the Sea

 

 

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Let's start with age... there is a lot of Cretaceous between Casper and Alcova, but it really depends on where you were.  Looks cretaceous to me.  NOt sure what the fossil is but ,maybe a coral.  They are not common in WY Cret but they are known.  

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Today I'm finishing preparing a bivalve that was found at the same location.  I'll post it, maybe it'll shed some light on the layer.  Thanks @jpc

-Jay

 

 

“The earth doesn't need new continents, but new men.”
― Jules Verne, Twenty Thousand Leagues Under the Sea

 

 

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Here it is @jpc

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-Jay

 

 

“The earth doesn't need new continents, but new men.”
― Jules Verne, Twenty Thousand Leagues Under the Sea

 

 

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Hmmm... it might be an Inoceramus, but I cannot claim to be an expert.  The rock and preservation looks like Frontier Fm.

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On 7/23/2024 at 9:49 PM, jpc said:

Hmmm... it might be an Inoceramus, but I cannot claim to be an expert.  The rock and preservation looks like Frontier Fm.

Thank you so much jpc!  Are shrimp burrows known from the Frontier Fm?  We found many of these trace fossils in the same layer.

-Jay

 

 

“The earth doesn't need new continents, but new men.”
― Jules Verne, Twenty Thousand Leagues Under the Sea

 

 

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