Jurassic Navajo Sandstone in Zion National Park, southern Utah. The sloping lines within the sandstone (crossbeds) indicate the sediment accumulated in a large dune field. This image relates to an ...

NPS said it was formed from 190 million-year-old Navajo sandstone, which originated in the late Triassic to early Jurassic ...

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