The fossil the blue arrow is pointing to appears to be a
Palaeoconchus (aka
Spirobus) worm fossil. It was found in the Glen Dean formation.of Grayson County,
Kentucky USA. The fossil dates to the Mississippian Period. The worm fossils is intermixed with bryozoans (maybe
Fenestella). Image was taken with a microscope with an approximate 4 mm field of view (FOV).
Learn more about this worm fossil at the Falls of the Ohio State Park web site:
http://www.fallsoftheohio.org/Fossil_Worms.html
Thanks to Kenny for the image for this blog posting.
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