- Guerneville Mining District
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Henderson, F.B. (1969) Hydrothermal alteration and deposition in serpentine-type mercury deposits. Economic Geology: 64: 491 Van Nostrand Reinholt Press: 438. |
Devils Pulpit, The Geysers, West Mayacmas Mining District, Sonoma County, California, USA