Here's a breakdown:
* The Grand Canyon's layers are mostly composed of sandstone, shale, and metamorphic rocks like schist and gneiss. These layers were deposited over millions of years in a variety of environments, from ancient oceans to vast deserts.
* Limestone is present in the Grand Canyon, but it's found in thinner layers and at specific elevations. One notable limestone layer is the Muav Limestone, which is visible in the canyon's lower sections. It dates back to the Cambrian period (about 540 million years ago) and was formed in a shallow, warm ocean environment.
* Another limestone layer, the Redwall Limestone, is located higher up in the canyon and is much thicker than the Muav Limestone. It dates back to the Mississippian period (about 350 million years ago).
So, while not as abundant as sandstone, limestone is definitely a part of the Grand Canyon's geological story, contributing to the canyon's stunning diversity and layers.
