|
USA | |
|
| Mahaffey, Nova, Finkelman, Robert B. (2022) The Extraordinary Variety and Complexity of Minerals in a Single Keokuk Geode from the Lower Warsaw Formation, Hamilton, Illinois, USA. Minerals, 12 (7) 914 doi:10.3390/min12070914 |
|
| Robertson, Percival (1942): Bituminous matter in Warsaw geodes [abs.]: Transactions of the Ilinois State Academy of Science, v. 35, no. 2, p. 138-140.
van Tuyl, Francis M. (1923): Annual Reports for the Year 1921-22, Mississippian. The Stratigraphy of the Mississippian Formations of Iowa, Iowa Geological Survey, Annual Report, Volume 30 |
- Cave-In-Rock Mining Sub-District
| Mineralogical Record (1997) 28:3-49 |
|
| Mineralogical Record (1997) 28:3-49 |
|
| Philip Bluemner photo |
|
| Mineralogical Record (1997) 28:3-49 |
|
| Russ Rizzo Collection via Jared Freiburg (Saga Minerals) |
|
| Mineralogical Record (1997) 28:3-49 |
|
| |
|
| Stuart Weller, Charles Butts, Louis W. Currier, Rollin D. Salisbury (1920) The geology of Hardin County, and the adjoining part of Pope County Illinois Geological Survey Bull. 41 |
|
| Econ Geol (1994) 89:288-306 |
|
| Freiburg, J. and Rakovan, J. (2012) The Conco Mine, North Aurora, Kane County, Illinois. Rocks & Minerals, 87, #2, 116-125. |
- Stewart Mining Sub-District
| |
Hastie's Quarry, Spar Mountain, Cave-In-Rock Mining Sub-District, Hardin County, Illinois, USA