This is a beautiful spiny trilobite. It is a Selenopeltis buchii(?) from the Ordovician Layers of Morocco. This fossil was prepared in the EXTINCTIONS Preparation Lab, here in Walsenburg, Colorado. This type of trilobite is usually found in brown sandstone - this specimen is preserved in dense limestone. The thick shell exoskeleton is very well preserved and contrasts wonderfully with the sculpted grey matrix. The large bug is very 3-D and is nicely centered on the natural block of limestone. This is one of the most displayable Selenopeltis we have ever had.