Dawsonoceras cephalopod found in the Waldron Shale of Clark County, Indiana.  Creature existed in the Middle Silurian Period. It has si...

UPDATE (11/19/2017): The long semi-transparent specimens in the images might be a sponge spicule. I was reading the a book entitled  On ...

This appears to be a Paraconularia magna fossil. It was found in the Cisco group Finis Shale of Jack County Texas. It is from the Pennsy...