Silurian Graptolite - Ptiograptus percorrugatus?

Originally I thought this was a branching dendrite but after studying it, appears to be a graptolite fossil.  It might be a Desmograptus, Dictyonema, or unidentified graptolite.  I do not have much literature on these creatures to make a good guess.

This fossil has great contrast in relation to the limestone!

Fossil found in the Louisville Limestone (Middle Silurian Period) Jeffersonville Limestone (Middle Devonian Period) of Jefferson County, Kentucky, USA.

UPDATE (2020): I was contacted by Dr. Jörg Maletz of the Institut für Geologische Wissenschaften at Freie Universität Berlin and he would like to study this specimen to see if it is a Ptiograptus percorrugatus. Now I just have to find out where I put it.

UPDATE (2025): I found the fossil and a new posting has been made: https://louisvillefossils.blogspot.com/2025/03/ptiograptus-percorrugatus-graptolite.html

Trilobite Pygidiums of the Birdsong Formation

These pictures show four different trilobite pygidiums from the Devonian Birdsong formation of western Tennessee, USA.  Identifications on these fossils is not been determined.  Thanks to Herb for showing me these fossils.

Huntonia lindenensis? Trilobite Cephalon

A cephalon of a Huntonia lindenensis? trilobite found in western Tennessee.  The fossil was found in the Birdsong Formation of the Lower Devonian Period.  It appear to be a molt as the eye lens on one side are covered with a bryozoan.  The molt must have been exposed on the seafloor for a while for this colony to establish.

Thanks to Herb for letting me photograph it.