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I'm looking for information about these rocks.


Jason Stallings

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They have the general look of the Ordovician bryozoa called Prasapora. But unfortunately I do not see the finer diagnostic features that would confirm this possibility. So I lean towards rocks, not fossils. 

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Possibly the trace fossil Conostichus.

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@TqB Conostichus is a new name to me. They look surprisingly similar to Prasapora from a distance! Did they occur back in the Ordovician? @Jason Stallings, do you know the formation these specimens came from?

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Jason Stallings

I found them on different job sites around the fort Smith area. I don't know anything thing else about them.  Over the years I've collected these. Thanks for any information. Here's another larger one.

 

IMG_20221204_073608919.jpg

IMG_20221204_073602118.jpg

IMG_20221204_073554482.jpg

IMG_20221204_073548218.jpg

IMG_20221204_073519096.jpg

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1 hour ago, minnbuckeye said:

@TqB Conostichus is a new name to me. They look surprisingly similar to Prasapora from a distance! Did they occur back in the Ordovician? @Jason Stallings, do you know the formation these specimens came from?

A cursory search finds this paper with possible Ordovician specimens.

Middle Ordovician Trace Fossils…Eastern Canada

 

And this blog has Arkansas (Ozarks) specimens but doesn't give an age. 

https://arkansasgeological.wordpress.com/2016/10/06/geo-pic-of-the-week-conostichus-trace-fossils/

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