The Kaibab Limestone, the topmost layer of rock in the Grand Canyon, was formed at the ocean's bottom. However, it is now located up to 9,000 feet above sea level. This layer contains numerous ...

A shallow sea advances and retreats several times during this period, leaving behind the layers named Kaibab Limestone, Toroweap Formation, and Hermit Shale. The Coconino Sandstone layer was ...