mancos shale

[Jdeutsch]

Mancos shale outside of Grand Junction Colorado

2 inches in length

[Fossildude19]

Very interesting !

 

Enlarged and contrasted:

Maybe @piranha may have some ideas... 

 

[GallinaPinta]

This fossil would look astonishingly good if prepped...

[Top Trilo]

It looks a lot like this 

posted in your topic more than 4 years ago, 

 

[Rockwood]

I think this is a trace fossil. 

Feeding trace. Notice how the shape to the left is roughly repeated near the center. 

[Jdeutsch]

regarding comment by  trilo

 

this specimen is very different than the mancos shale images posted 4 years earlier

 

the pieces 4 yrs ago were found about 20 miles south,  were in clusters and mixed in with obvious shell fragments 

the matrix was also different-brown coated black shale and there were also geodes that were 3 feet across in that same gray slate

 

this current specimen didn't keep the same company and was in -brown mudstone

 

Having both in hand makes it unlikely, IMO, that they are of the same origin

 

I have some overview images for matrix comparison

 

of course, if my opinion was definitive, I wouldn't post the image for others to chime in