3.1" Unknown Fossil Vertebrae And Bones in Matrix Late Cretaceous Era Niobrara FM KS Ruby & Zoisite While the lake once spanned

While the lake once spanned up to 930 square miles

a deep mandible

their resilience came to an end during the Cretaceous-Paleogene (K–Pg) extinction event

Their rapid evolutionary turnover makes them invaluable as index fossils

3.1" Unknown Fossil Vertebrae And Bones in Matrix Late Cretaceous Era Niobrara FM KS Ruby & Zoisite While the lake once spannedLocation: Niobrara Formation, Gove County, Kansas Weight: 1. 9 Ounces Dimensions: 3. 1 Inches Long, 2. 6 Inches Wide, 0. 9 Inches Thick Late Cretaceous, 83 million years old The item pictured is the one you will receive. The Niobrara Formation in Gove County, Kansas, is a significant geological unit, primarily composed of chalk and calcareous shale, deposited during the Late Cretaceous period. This formation is renowned for its rich fossil record,