First off, what causes the
redness in the sandstone? It's oxidized-iron or
rust! You're in the rust-belt! In the late permian period, when most of the Sedona-area rocks were deposited, the mountains in Colorado where slowly eroding (known as the ancestral rocky mountains, pre-dating the current ones). The eroded material had a high iron content. If you're south of Las Vegas, northwest Texas, or even Colorado Springs, you can see the same red permian layer. Here, you're literally looking at
left-over Colorado! And we're keeping it!
You're actually right
below the edge of what is called the '
Colorado Plateau', which stretches north into Utah, Colorado and upwards to southern Idaho. When you climb the switch-backs in Oak Creek canyon, you're climbing up on top of the plateau. It's unique, being a 'geological island' that has 'floated' intact for maybe 600m years! That's why many of the layers you see here can also be seen at the Grand Canyon and even up in Idaho.
We've graciously (!) created
four tours for your geological pleasure: