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USA | |
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| [Agate var. Brecciated Agate] |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| Jay Ellis Ransom,1974,Gems and Minerals of America |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate] Jay Ellis Ransom,1974,Gems and Minerals of America |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate] MacFall (1975) Gem Hunter's Guide |
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| [var. Chalcedony] MacFall (1975) Gem Hunter's Guide |
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| [var. Chalcedony] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [var. Chalcedony] Specimen from the collection of Kieth Harshbarger (1974) [Rock Currier 2010] |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Chalcedony var. Carnelian] |
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| Zeitner (1956), Midwest Gem Trails |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate] MacFall (1975) Gem Hunter's Guide |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| Banforth, D., Becker, M., and Hudson, J. (2005) Intrasite Spatial Analysis, Ethnoarchaeology, and Paleo-Indian Land Use on the Great Plains: The Allen Site, American Antiquity, 70 (3), 561-580.
Blasing, Robert (2000) The History of Archeological Research at Medicine Creek Reservoir, U.S. National Park Service Publications and Papers, 2. |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| Collected, K. Nash, 2000 |
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| Kelly Nash Collection |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [var. Amethyst] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| Rocks & Min.: 18:323. |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate] MacFall (1975) Gem Hunter's Guide |
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| [Chalcedony var. Moss Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| Woolley, A. R. (1987) Alkaline Rocks and Carbonatites of the World. Part 1: North and South America. |
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| Verplanck, P. L., Farmer, G. L., Kettler, R. M., Lowers, H. A., Johnson, C. A., Koenig, A. E., & Blessington, M. J. (2022). Petrogenesis and Rare Earth Element Mineralization of the Elk Creek Carbonatite, Nebraska, USA. Ore Geology Reviews, 104953.
Verplanck, P. l., Farmer, G. l., Kettler, R. M., Lowers, H. A., Koenig, A. E. and Blessington, M. J. (2014), Rare Earth Element Enrichments in the Elk Creek Carbonatite. Acta Geologica Sinica, 88: 466β467.
Carlson, M.P. & S.B. Treves, 2005, βThe Elk Creek Carbonatite, Southeastern Nebraska β An Overviewβ, Natural Resources Research, vol. 14 No.1. |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Chalcedony var. Moss Agate] Dorothy M. Schlegal (1957) Gem Stones of the United States : USGS Bulletin 1042-G |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate] MacFall (1975) Gem Hunter's Guide |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate] MacFall (1975) Gem Hunter's Guide |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate] MacFall (1975) Gem Hunter's Guide |
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| [var. Chalcedony] Jay Ellis Ransom,1974,Gems and Minerals of America |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Chalcedony var. Moss Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate] MacFall (1975) Gem Hunter's Guide |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate] Jay Ellis Ranson,1974,Gems and Minerals of America |
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| MacFall (1975) Gem Hunter's Guide |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Chalcedony var. Moss Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate] MacFall (1975) Gem Hunter's Guide |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate] MacFall (1975) Gem Hunter's Guide |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate] MacFall (1975) Gem Hunter's Guide |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [var. Chalcedony] Jay Ellis Ransom,1974,Gems and Minerals of America |
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| [Fortification Agate var. Fairburn Agate] |
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| [Fortification Agate var. Fairburn Agate] |
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| Jay Ellis Ransom,1974,Gems and Minerals of America |
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| [Chalcedony var. Moss Agate] Dorothy M. Schlegal (1957) Gem Stones of the United States : USGS Bulletin 1042-G |
- Agate Fossil Beds National Monument
| [var. Chalcedony] Zeitner (1956), Midwest Gem Trails |
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| [Agate var. Fortification Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [var. Chalcedony] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| Pabian, Roger K. (1993), Minerals and Gemstones of Nebraska, Conservation and Survey Division (Nebraska Geological Survey), School of Natural Resources, University of Nebraska, Educational Circular 2. |
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| The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
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| [Agate var. Lake Superior Agate] The Minerals and Gemstones of Nebraska CSD U Neb EC 2 |
Dawes County, Nebraska, USA