Small fossil, what is it?

[Kelly Fisher]

Found this is Greers Ferry AR. What is it?

[Kelly Fisher]

My 4yr old son and I were on a walk near Greers Ferry Lake on north central Arkansas and came across this beauty. Any thoughts on what it is? 

[howard_l]

Looks like that area is Pennsylvanian in age.

[ynot]

Can You show the whole piece front and back?

Tony

[fifbrindacier]

I don't know what you have, but you might find informations from here : http://paleoportal.org

[Kelly Fisher]

[Kelly Fisher]

That is the front of the rock

[Kelly Fisher]

I'm sorry, but it will not let me upload the back of the rock. It keeps telling me that the file is too big, no matter how small I edit it down to 

[tmaier]

It kind of looks like a cross section through a bivalve to me. I can't explain all the parts of it, though.

https://www.google.com/search?q=fossil+cross+section+bivalve&btnG=Search&hl=en&gbv=1&tbm=isch

[Carl]

It's a bit unclear, and might even be a fortuitous no-fossil mark in the rock, but it immediately reminded me of this: http://www.dailymail.co.uk/sciencetech/article-1091549/Oldest-prehistoric-dragonfly-imprint-312million-years-ago-discovered.html 

[fifbrindacier]

I agree with this, my first impression was it could be an insect. But i hesitated because of the plan-like thing you can see on its left.

[Plantguy]

Pretty cool! I can see how some of the other ID ideas have been proposed but I think its a feeding/burrow trace. Arkansas appears to have lots of crazy traces. The geological survey there actually having a blog where some of the latest entries have been covering some of the various traces....scroll thru it and youll see a fair number of shapes/types..

https://arkansasgeological.wordpress.com/tag/asterosoma/

 

This trace example from that blog has some similarity but not sure its the exact critter/type.  

https://arkansasgeological.wordpress.com/tag/asterosoma/#jp-carousel-331

 

Regards, Chris