Chert from San Juan County, Utah, USA
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Bull. Minéral. , 1987, 110, pp. 145-156. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
(1974) The Geologic Story of Canyonlands National Park. Bulletin Vol. 1327. US Geological Survey doi:10.3133/b1327 | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |