Here is an index fossil for the Silurian Period called a Halysites It was found in central Jefferson County in the state of Kentucky.

Here is a trilobite found by a KYANA Geological Society ( www.kyanageo.org ) member on a field trip some years ago. It is a Trimerus delphi...

The side view of a Trimerus delphinocephalus found in Clark County, Indiana in the Waldron Shale layer. The creature lived in the Silurian ...