On September 21, 2020, I posted this fossil but was unsure what exactly it was. After consulting with my cousin Kenny and Ken (a Waldron Shale fossil hunter of over 40 years), I am leaning toward and identification that this fossil is a cluster of cystoid holdfasts.
Kenny showed me a paper entitled Taphonomy of diploporite (Echinodermata) holdfasts from a Silurian hardground, southeastern Indiana, United States:palaeoecologic and stratigraphic significance by James R. Thomka and Carlton E. Brett published in 2014 at Geol. Mag. 151 (4) in 2014 pages 649-665. It shows a variety of fossils similar to the one pictured that are thought to be parts of Silurian cystoid fossils.
A link to that paper is here:
http://webcentral.uc.edu/eprof/media/attachment/eprofmediafile_2376.pdf
The fossil was found the Silurian Period (Wenlock: Homerian Stage) in Clark County Indiana, USA. If this fossil is a series of holdfasts, then they grew in close proximity to one another.
I have found numerous cystoids in the Waldron Shale notably Caryocrinites (Say, 1825) and Holocystites (Hall 1864) aka Megacystites (Hall, 1865). See previous entries:
https://louisvillefossils.blogspot.com/2010/06/holocystites-cystoid.html
https://louisvillefossils.blogspot.com/2011/08/caryocrinites-cystoid-in-matrix.html
https://louisvillefossils.blogspot.com/2011/10/caryocrinites-persculptis-cystoid.html
https://louisvillefossils.blogspot.com/2012/05/pyrite-encrusted-caryocrinites-cystoid.html
https://louisvillefossils.blogspot.com/2012/12/silurian-caryocrinites-cystoid-fossil.html
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