It is difficult to sometimes identify Devonian Period crinoid stems without their calyx. This specimen was found in Clark County, Indiana,...

Here is an image of a large crinoid calyx (about 10 cm in diameter). It was found in the Devonian Period Jeffersonville (?) Limestone of ...

The Online Repository of Fossils Museum of Paleontology at the University of Michigan has a GREAT 3D fossil web site. It can be found at ...