Brachiopod Replaced with Quartz/Calcite

Here is some Devonian rock with a brachiopod cavity filled with quartz or calcite.

It was found in Louisville, Kentucky.

Cryptolithus Trilobite Fragments

Here are some Cryptolithus trilobite fragments from Carroll County, Kentucky.

Coral Diversity

Here is a composite rock made up coral fragments. It is Devonian judging by where it was found in Louisville, Kentucky and the rock color.