Unidentified Crinoid

Here is a crinoid calyx with arms and an imprint where the stem was.  The fossil needs to be air abrasive cleaned to reveal more of its details. Crinoid calyx was found in Indian Springs Formation of Crawford County, Indiana. This animal existed in the Mississippian Period.

It is the first Mississippian crinoid I have found with arms.

Spirifer (Delthyris) crispus simplex

This small brachiopod fossil appears to be a Spirifer (Delthyris) crispus simplex named by paleontogist James Hall in the 1800s.  Fossil was found in the Waldron Shale of Clark County, Indiana.  Dated to Middle Silurian Period (425 to 412 million years ago). A special find for me as it marks the 17th species found of identified brachiopod from the Waldron Shale.  See the others at this blog posting: CLICK HERE

Next picture is a magnified view of the growth lines on the fossil under a microscope.

Bryozoan on Crinoid Stem

Bryozoan colony on crinoid stem from the Indian Springs Formation of Crawford County, Indiana. Animal dates to Mississippian Period.  Image taken using microscope.