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jort68

Hey all! Just bought this piece at a rock shop here in Chicago. It was sold to me as a shrimp, the shop owner was pretty confident in this, but I'm pretty sure it's a fern instead. Not disappointed since I just appreciate the composition here, it's a super pretty one, kind of off-beat. ^_^ Can anybody help ID the exact fauna?

 

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Thanks so much!

IMG_7106 (1).JPG

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caldigger

Looks like a MC shrimp to me.

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Joe_17

If that's the rock shop im thinking about, i've always wanted to visit there.

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fifbrindacier

I must agree with @caldigger because i Don't recognize a fern pattern (i have some from Mazon Creek which is the kind of amazing place i would love soooo much to visit).

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Mark Kmiecik

Looks like Acanthotelson stimpsoni, but I'm not a shrimp expert so I'll wait for the better informed to tell us for sure.

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sixgill pete

Looks like a shrimp to me also. 

@Nimravis

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jort68

Honestly this is amazing news, yet now my fossil collection remains solely marine. Making a trip to Mazon Creek in March which should round out my collection with some fauna (:
 

@Joe_17 it's not dave's, sadly... I'm going to visit him for the first time soon too though. This is one on Michigan ave, pretty discreet, it's near the block across the street from the bean. 

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connorp
13 minutes ago, jort68 said:

Making a trip to Mazon Creek in March which should round out my collection with some fauna

Will it be your first trip? Hopefully the weather is agreeable. Last year I went on opening weekend and the ground was still frozen solid, so not very productive.

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Joe_17
31 minutes ago, jort68 said:

Honestly this is amazing news, yet now my fossil collection remains solely marine. Making a trip to Mazon Creek in March which should round out my collection with some fauna (:
 

@Joe_17 it's not dave's, sadly... I'm going to visit him for the first time soon too though. This is one on Michigan ave, pretty discreet, it's near the block across the street from the bean. 

Oooooh I've been there then.  That was close to my college . It is pretty hard to spot if you're not looking for it .

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Nimravis
1 hour ago, sixgill pete said:

Looks like a shrimp to me also. 

@Nimravis

I agree with @Mark Kmiecik on his ID, I was going to say the same thing, looks Acanthotelson.

 

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RCFossils

Agree that this is an Acanthotelson.

Do you have both halves?

The head is missing and it might be preserved on the other side.

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Wrangellian

I'm trying to picture this... Are we looking at the back half of a shrimp from the top or bottom, as opposed to a side view?

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Spoons
3 hours ago, Wrangellian said:

I'm trying to picture this... Are we looking at the back half of a shrimp from the top or bottom, as opposed to a side view?

I think we might be just looking at premineralization of the legs? The body might be preserved as a cast? It’s hard to tell from the pics.

 

I think it’s preserved in lateral view, and, at least in the first picture, he’s holding the specimen upside down?

Edited by Spoons
More details added to facilitate understanding of superposition

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jort68

I'm not quite understanding the orientation myself, and maybe I've been looking at it for too long, but could this be the shrimp's head I'm seeing? With an eye? Or is it just the body where it's been cut off?

 

 

Screen Shot 2020-02-04 at 10.58.59 PM.png

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jort68

@connorp It'll be my first, yeah! Have consulted a few guides and will be trying a few angles on the day. Hopefully something will happen for me and if not, I'd feel good just having gone to the famous place. 

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Wrangellian
1 hour ago, Spoons said:

I think we might be just looking at premineralization of the legs? The body might be preserved as a cast? It’s hard to tell from the pics.

 

I think it’s preserved in lateral view, and, at least in the first picture, he’s holding the specimen upside down?

If those are legs, to me they appear to be on either side of a mid-line, which would imply dorsal or ventral. Also, I'm not sure, but they appear to alternate left-right-left-right, instead of directly oppose each other.

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