The Niobrara Chalk is a geological formation primarily found in the central United States, particularly in states like Colorado, Kansas, and Wyoming. It dates back to the Late Cretaceous period, around 70 million years ago, and is known for its rich deposits of chalky limestone and marl. This formation is significant for its fossil content, including marine life such as ammonites and plankton. In addition to its paleontological importance, the Niobrara Chalk is also a valuable resource for oil and natural gas production. The formation contains organic-rich layers that have generated hydrocarbons, making it a target for energy exploration. Its unique geological characteristics contribute to both scientific research and economic activities in the region.