Silurian Period Myelodactylus convolutus crinoid arm/stem fossil found in the Waldron Shale of Clark County, Indiana, USA.  This fossil...

Earlier in the year, I posted an image of this Bumastus niagarensis (originally described in 1879 as Illaenus niagarensis ) when it was fou...

Pictures of two marble size cystoids (Rhombifera) of the Waldron Shale (Niagara Limestone) of Clark County, Indiana.  These cystoids are ca...