This picture is of a rudist bivalve fossil called Coralliochama orcutti (White, 1885). Picture was taken in 2016 at Indiana University Dep...

  This picture is of a crinoid calyx fossil called Scytalocrinus robustus (Hall, 1861). Picture was taken in 2016 at Indiana University Depa...

  This picture is of a heteractinid sponge fossil called Astraeospongium meniscus (Römer, 1854). Picture was taken in 2016 at Indiana Univer...