Here is a small cephalopod mold about 2 cm across. A siphuncle can be seen in the center of this mold filled with calcite or quartz. This ce...

Here is a view of two sides of the colonial coral. This one was found in eastern Jefferson County, Kentucky. It is an Ordovician coral.

Here is an Ordovician horn coral found in eastern Jefferson County, Kentucky. I sliced off the top part that was covered with debris using ...