Double Arch was formed by downward water erosion from atop the sandstone.
The Formation of Double Arch
Unlike many arches that are carved by water flowing sideways through rock fins, Double Arch was created through a distinct process involving downward water erosion. This erosion occurred from the top surface of the sandstone layer over a long period.
Key Formation Process
The primary mechanism behind Double Arch's creation is downward water erosion from atop the sandstone. This means that rain and water seeping into cracks and weaknesses on the upper surface of the rock gradually wore away the material below, hollowing out the rock from the top downwards.
This process is different from the more common side-to-side erosion that carves arches in narrow fins. The reference explicitly states that the formation was from downward water erosion from atop the sandstone, rather than from side-to-side water erosion.
The Resulting Structure
The specific way this downward erosion occurred resulted in a unique geological feature. Double Arch is named for its structure, which consists of two prominent arches. These two arches share a common piece of stone that serves as a foundation for both of their outer legs.
Understanding the formation of Double Arch highlights the diverse ways natural forces, particularly water, can sculpt the landscape, creating stunning and varied rock formations.
