Fossil was found in the Waldron Shale of Clark County, Indiana, USA. It dates to about 419 million years ago which is the Silurian Period.
This next image is a close up of the thorax segments on the side of the fossil. The detail of the texture on the plates is nice. A series of small bumps can be seen, maybe these served as some sort sensory system.
This last series of pictures show the fossil from different angles. Thanks to Kenny for prepping this fossil!