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Thornton Quarry fossil ID requested


Ruger9a

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Does anyone know what this creature is or is it a plant?  It has stumped me for quite some time.  Background - It's an old acquisition from Thornton Quarry in Thornton, Illinois.  Silurian period.  It measures approximately 5" x 3.5". 

20191029_124818.jpg

Edited by Ruger9a
add measurements 5cm x 2.2cm
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Looks like the imprint of rugose, or "horn" coral. 

 

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Definitely it is a solitary rugose coral, as Tim said.

Interesting thing about photos, Tim sees an impression but I see a +ve.  Hard to be sure without knowing where the light is coming from.

 

Don

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16 minutes ago, FossilDAWG said:

Definitely it is a solitary rugose coral, as Tim said.

Interesting thing about photos, Tim sees an impression but I see a +ve.  Hard to be sure without knowing where the light is coming from.

 

Don

 

I just went by what the shadows looked like to me.  :shrug:

 

20191029_124818.thumb.jpg.da6e2257530b438d01c81384d44160d4.jpg

 

 

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Tim & Don, Thanks guys.  I checked out the link and sure enough that's what it is!  Finally an identification, thanks you experts.  

 

Don, it is definitely an impression.  The light is coming from a lamp on the left side of the fossil.  It was part of a limestone reef according to the seller. I tried to post three photos, but was not allowed to. 

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Moved to Fossil ID. ;) 

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