Submitted by: David Thompson
            
            Taxon:  Protitanichthys rockportensis
            
            Submit date: 2008-01-28
            
            Location (approximate): Milan, Washtenaw, MI
            
            Stratigraphy: Traverse Formation
            
            Age: Erian (Middle Devonian)
            
            Submitter notes: The  Phylum is Chordata, Subphylum Vertebrata, Class Elasmobranchiomorpha,
Subclass Placoderm, Order Arthrodire, suborder Brachythoraci, Family Coccosteidae, Genus Protitanichthys. This shows some of the thickness of the bony shield. US .25 coin for scale.