The last and highest layer of rock that is visible in the Red Rock formations of Sedona is the White-Gary Kaibab Limestone. This layer was formed between 260 and 240 years ago during the final inland motion of the Pedregosa Sea (Arizona Ruins). It is can be up to 300 feet thick and it has been known to have fossils of ancient marine animals such as sharks and sponges brachiopods and other fish remnants from its time under the ancient Sea. Sedona shares this layer with the Grand Canyon and other parts of Northern Arizona (Sadler). There were originally other layers that toped the Kaibab Limestone formation, such as the Moenkopi formations and the gravel rim and basalt cap, however, they are no longer present in Sedona due to erosion and can only be found in other areas of Northern Arizona and the Mogollon Rim which is the name given to the encampment that runs east to west in Northern Arizona (Arizona Ruins).
The Kaibab Limestone
(Left) The rim of Sedona is made of the Kaibab Limestone