Devonian wood fragments of an Archaeopteris progymnosperm. The wood part is also referred to as a Callixylon . These fragments were found i...

Here are some Silurian period crinoid calyx plates from the Louisville limestone. It is called Caryocrinites and was found in Jefferson Cou...

On June 17, 2009 I highlighted a Devonian Mediospirifer brachiopod. Today, I revisit this brachiopod after sandblasting the matrix off of ...