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The conservation of soft parts in the fossil record is somewhat exceptional and only occurs under certain and exclusive taphonomic conditions
Shanghaiaspis
United States (35: Alabama
13 teeth on a maxillary 16 teeth on a dentary
Next you can visit a link with very interesting information about this sedimentarian basin rich in fossil vertebrates: Ouled Abdoun Basin
14003 - Amazing Large Rare Igdamanosaurus (Globidens) Mosasaur rooted Tooth Calamites The conservation of soft partsThis is a unusual Mosasaur rooted tooth from Igdamanosaurus aegyptiacus, formerly assigned to the genus Globidens. Most Mosasaurs had sharp teeth that had evolved to grab slippery prey such as fish. Igdamanosaurus had semispherical teeth with rounded nubbin like points, which were much better suited for crushing tough armored prey like small turtles, ammonites, nautili, and bivalves. IT HAS BEEN RESTORED: It has some glued and restored (filled