Cretaceous (83 m.y.o.)
Niobrara Formation/Smoky Hill Chalk
Gove County, Kansas, USA
Xiphactinus audax – This massive jaw is the largest we have discovered in 35 years of collecting in the chalk beds of western Kansas. It could be maximum size for the species. The jaw measures 19” (48.2 cm.) long, 5” (12.7 cm.) tall, and 2” (5.08 cm.) thick. There are a total of 21 teeth; the 18 in the maxillary are original and in excellent condition. The largest of these original teeth is 2″ long. The 3 teeth in the pre-maxillary are reproductions. Bone quality and detail are excellent. Dynamic exhibit specimen!