The Sandstones rock formations
The red rocks are sandstones sedimentary type of rocks and they are formed by sedimentation of material from the surface of Earth and bodies of water. It composes with sand, silt, and clay. The process causes mineral and organic detritus to settle and accumulate from solution. Weathering and erosion formed sedimentary rocks and push to certain area by water, wind, or mass movement.
Here is video from youtube.com explaining how the Red Rocks was formed.
Landforms: beautiful view of Strike Valley between Hag-backs formed from Erosion folds such as physical breakdown and Hag-backs is produced by softer rock strata