Which specific geological layer in Kansas provided many critical fossils used to study *Xiphactinus*?
Answer
Niobrara Formation
A significant portion of the scientific understanding of *Xiphactinus* is derived from fossils recovered from a very specific geological area: the Niobrara Formation, located primarily in Kansas. This geological layer, deposited within the ancient Western Interior Seaway, is renowned for its high-quality fossil preservation. The sheer quantity and excellent condition of the *Xiphactinus* specimens recovered from the Niobrara Formation have been fundamental in reconstructing the appearance, diet, and ecological role of this massive Cretaceous predator.
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