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Lillian

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Lillian

A few months ago I was helped here to identify a clam fossil and now near the same area I have found  this.  It doesn't match any images that I have found searching.  Thank you.

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coled18

My guess would be echinoid (sea urchin). I'm not really sure though. 

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Fossildude19

Where was the item found?

 

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Lillian

In Central Illinois.  We dug a pond last year and I am finding a lot of interesting items in the mostly clay dirt.  A few months ago I found a crystallized clam, rocks with shell fossils in them and an Indian jewelry bead made from a stone.

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Fossildude19

Can we narrow it down to a county?

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Lillian

Livingston County south of Pontiac.

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piranha

It looks like a possible astylospongiid sponge.  AstylospongiaCarpospongia, Caryospongia, are all reported from the Ordovician of Illinois.

 

This excellent paper has a bunch of similar examples for comparison:

 

Rhebergen, F., & Von Hacht, U. (2000)

Ordovician erratic sponges from Gotland, Sweden.

GFF, 122(4):339-349   PDF LINK

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Fossildude19

That looks like a good match, Scott. 

Great work!

 

 

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Lillian

You guys are the best!  I wish I had your knowledge.  My erratic sponge is on display with my other items.  Can't wait to find find more.

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piranha
14 minutes ago, Lillian said:

You guys are the best!  I wish I had your knowledge.  My erratic sponge is on display with my other items.  Can't wait to find find more.

 

 

'Erratic' only refers to glacial deposition of the sponges found in Sweden.

 

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Rockwood
8 hours ago, piranha said:

 

 

'Erratic' only refers to glacial deposition of the sponges found in Sweden.

 

It also has a much broader definition having to do with the distance that glaciers have displaced any rock from it's origin.

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doushantuo

One of the standard depictions of European erratic transport

Carpospongia globosa(weathered specimen) looks like a good bet?

Sometimes the morphology of the megascleres is more informative than outer appearance,BTW

(vide AND fide v. Hacht,Reitner et al)

Glacial transport(sometimes with multiple reworking) AND frost are causes of secondary fragmentation,truncation,etc

BTW:

Show Us Your Sponges - Page 3 - Member Collections - The Fossil Forum

www.thefossilforum.com › Fossil Discussion › Member Collections
  1.  
Vertaal deze pagina
19 okt. 2011 - Hope I can get it as pdf. ... Five specimens of Aulocopium aurantium, same deposits as previous sponges, also Ordivician in age. These are ...

evis.jpg

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Lillian

I stand corrected and am learning more.

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Lillian

Looking at the Show us your sponges from page 3 - is that what this is too?  I found this in the same area.   I thought it was a bone.

 

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Edited by Lillian

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