Prone Calymene Trilobite Fossils

Here are pictures of some Calymene breviceps trilobite fossils. They were found in the Waldron Shale of Indiana. They existed in the Silurian Period (about 425-419 million years ago). They have not been cleaned yet. Thanks to Kenny for letting me photograph them. The prone ones are about 4-5 cm long and 2-3 cm wide.

Enrolled Calymene Trilobite

Here are some pictures of a Silurian trilobite called the Calymene breviceps? found in the Waldron Shale of Indiana. It is enrolled which might mean it is not a molt. The cleaning process has not been complete as I think I will leave it partially in the matrix. See the before and after images above. The next image shows the fossil about to break away from its matrix base.

Lyriocrinus Crinoid Calyx Cup

This fossil appears to be the bottom of a Lyriocrinus calyx cup found in the Waldron Shale of Clark County, Indiana. It is dated to the Middle Silurian Period (425-419 million years ago). Here is a blog post showing an arm fragment of this type of crinoid (blog post here).