Agate from selected localities.
USA | |
| John Paul Gries (1996) Roadside geology of South Dakota |
Clark, Roger (2002) Fairburn Agate: Gem of South Dakota (Silverwind Agates, Publ., Appleton WI); pgs. 21,24,79 et al. | |
[Fortification Agate var: Fairburn Agate] Clark, Roger (2002) Fairburn Agate: Gem of South Dakota (Silverwind Agates, Publ., Appleton WI); pgs. 21,24,79 et al. |
Teepee Canyon, Custer County, South Dakota, USA