The Moenkopi Formation is a geological formation located primarily in the southwestern United States, particularly in Arizona and Utah. It dates back to the early Triassic period, approximately 245 to 250 million years ago. The formation is characterized by its reddish-brown and gray sandstone, siltstone, and mudstone, which were deposited in a variety of environments, including river deltas and coastal plains. Fossils found within the Moenkopi Formation provide valuable insights into early terrestrial ecosystems. Notable fossils include those of early reptiles and amphibians, which help scientists understand the evolution of life after the Permian-Triassic extinction event. The formation is an important site for paleontological research and contributes to our knowledge of prehistoric climates and environments.