Friday, July 24, 2009

Ordovician Flexicalymene Trilobite

I picked this rock up in one of the eastern Louisville, Kentucky road cuts that has Ordovician Period fossils. Originally, I was attracted to a conical shaped cephalopod mold looking rock. Once I picked it up, it had a small exposed area of a trilobite thorax. The ridges of the thorax had matrix in them so it seemed like a good idea to sand blast them clean.

I took it to my cousin and pointed out that a cephalon was partially visible and maybe a whole trilobite was there. So he sandblasted the rock for about 20 minutes and what a surprise. There were sections of three Flexicalymene trilobites there. The largest one is about 2 cm long.

This is a work in progress. More matrix needs to be removed to see if another cephalon exists. Notice the white marks on the rock made by the engraver tool.


Solius Symbiosus said...

How about a pic of the pygidium?

Fossil Detective said...

I will post better pictures once the prep work is finished.

In the meantime, I will post some Flexicalymene pygidiums found recently in Carroll County, Kentucky.