https://digitalcommons.usu.edu/geology_facpub/381/
"Skeletal overgrowths among epizoans from the Silurian (Wenlockian) Wal" by W. David Liddell and C....
Substrata for numerous epizoans in the Silurian Waldron Shale were provided by the toppled and overturned calyces of camerate crinoids. These were inhabited by...