Xiphactinus audax | Monster Cretaceous Fossil Fish | Niobrara Chalk Formation, Kansas Turtle Agate generally forms by the

Agate generally forms by the deposition of silica from groundwater in hollow cavities of volcanic rocks

There were several species of Dimetrodon

8" around and stretches

making it even more unique

Entire schools of Priscacara have been found fossilized together

Xiphactinus audax | Monster Cretaceous Fossil Fish | Niobrara Chalk Formation, Kansas Turtle Agate generally forms by theXiphactinus audax 87 and 82 million years ago during the Coniacian, Santonian, and Campanian stages of the Late Cretaceous Niobrara Chalk Formation, Kansas Measures approximately 12 feet long by 5. 5 feet wide Xifactinus was a huge, terrifying carnivorous bony fish that hunted the Western Interior Seaway of North America during the Cretaceous period. While fossils of Xiphactinus can be found in many locations around the world from Europe to Australia,