Grotto Spring, Grand Canon, Colorado River. The water flows from the rocks above, and the umbrella-shaped rock about it is tufa. by Timothy H. O'Sullivan — VisualArtsDB
Grotto Spring, Grand Canon, Colorado River. The water flows from the rocks above, and the umbrella-shaped rock about it is tufa.
![[Gold Hill, West Silver City, Nevada, Silver Peak Range]](https://media.getty.edu/iiif/image/e58c0b40-f828-4345-b7c4-73d5bc880e60/full/843,/0/default.jpg)
![[Tufa Domes, Pyramid Lake, Nevada]](https://media.getty.edu/iiif/image/1929c9e9-939a-400b-a8d7-5318d06305e1/full/843,/0/default.jpg)
