Siltstone from Wyoming, USA
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Sumaila, S. (2017). Mineralogical and Geochemical Characterisation of Cores from an in Situ Recovery Uranium Mine. Masters of Science In the Department of Geological Sciences University of Saskatchewan |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Fossil Butte Visitor Center Exhibits (2018) National Park Service. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
(2005) Mineral Resources Data System (MRDS), US Geological Survey. | |
| en.wikipedia.org (n.d.) https://en.wikipedia.org/wiki/Amethyst_Mountain |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |