A popular geological feature in Utah known as the “Double Arch” — which hung over Lake Powell in the Glen Canyon National ...

The National Park Service said the arch was formed from Navajo sandstone that originated in the late Triassic to early ...

The rocks that formed Double Arch - also known as the "toilet bowl" because of the large hole in the formation - consisted of fine-grained Navajo sandstone from the late Triassic to early Jurassic ...