Iconic natural ‘Double Arch’ collapses at famous US national park

[Still Waters]

A popular natural rock feature that stood for millions of years has come crashing down into Lake Powell in Utah’s Glen Canyon National Recreation Area. Known as the Double Arch, the stunning geological attraction had been one of the park’s most visited beauty spots, but collapsed on Thursday, August 8th.

Also known as the Toilet Bowl, Crescent Pool, and the Hole in the Roof, the mesmerizing structure formed from 190-million-year-old Navajo sandstone and had the appearance of an enormous skylight in a grotto, allowing sunlight to illuminate a glittering patch of water in Rock Creek Bay. According to a statement from the National Park Service (NPS), the ancient structure had been shaped and warped by the elements since its formation, causing it to continually erode and break apart.

https://www.iflscience.com/iconic-natural-double-arch-collapses-at-famous-us-national-park-75507

[+Desertrat56]

I want to know who called the sandstone "Navajo sandstone"?