The blog post is a product of the Arizona Geological Survey.
On 31 May 2022, a massive block of Jurassic Navajo Sandstone toppled into Lake Powell near the northwest point of Wild Horse Mesa, roughly 0.1 mile south of the Arizona-Utah border. From photographs provided by Steve and Mila Carter, the block of sandstone was roughly 90 feet high with a mass estimated at between 4,700 metric tons and 13,400 metric tons. Today’s Arizona Geology blog post has dramatic still photographs of the collapse, a location map, and a model of block geometry and mass.
For full citations and links to the map products: https://blog.azgs.arizona.edu/blog/2022-05/new-digital-geologic-maps-2022-mohave-and-graham-counties