UPDATE (Jan 2023): This coral growth on the crinoid stem appears to be Cladochonus crassus (McCoy, 1847).
The image is of a tabulate coral Cladochonus beecheri? (Grabau, 1899 aka Monilopora) that grew on a crinoid column. The crinoid responded by growing over the coral leaving just the corallite openings. Some of the images show a root like structure that might be a crinoid holdfast or some sort of bryozoan.
Fossil found in the New Providence formation in Clark County, Indiana, USA. These creatures existed in the Mississippian Period.
