Large Fossil Starfish (Petraster?) - Part/Counterpart

This is a beautifully preserved Petraster starfish from the Ordovician aged Tioririne Formation near Blekus, Morocco. The orange coloration of the fossils is due to oxidization of iron pyrite which originally replaced the fossils. The bittlestar is very detailed and does have a lot of relief to it against the standstone. Both the positive and negative impression are included as well as a pair of display stand.

There is also an impression of a