Johnson Spring Formation
The Johnson Spring Formation is a geologic formation in California.[3] It preserves fossils dating back to the Ordovician period.[4]
| Johnson Spring Formation Stratigraphic range: Ordovician | |
|---|---|
| Type | Formation |
| Unit of | Eureka Group[1] |
| Underlies | Barrel Spring Formation |
| Overlies | Ely Springs Dolomite |
| Thickness | between 114 feet (35 m) and 398 feet (121 m)[2] |
| Location | |
| Region | Inyo Mountains, California |
| Country |  U.S.A. |
| Type section | |
| Named by | Harold Richard Pestana[2] |
Previously described as undifferentiated upper part of Eureka group by Langenheim and others, Pestana formally named the formation in 1960.[2] The Johnson Springs Formation underlies the Barrel Spring Formation and overlies the Ely Springs Dolomite.[5]
The type section is in Lead Canyon Trail section of the Independence quadrangle, Inyo Mountains.[5]
References
- R. L. Langenheim, Jr.; J. A. Barnes; K. C. Delise; W. A. Ross; J. M. Stanton (1956). "Middle and Upper(?) Ordovician Rocks of Independence Quadrangle, California". AAPG Bulletin. 40 (9): 2081–2097. doi:10.1306/5CEAE55C-16BB-11D7-8645000102C1865D. ISSN 0149-1423. Wikidata Q96655744.
- Donald Clarence Ross (1966). "Stratigraphy of some Paleozoic formations in the Independence quadrangle, Inyo County, California" (PDF). Professional Paper. 396: 18. doi:10.3133/PP396. ISSN 2330-7102. Wikidata Q61048695.
- Harold Richard Pestana (1960). "Fossils from the Johnson Spring formation, Middle Ordovician, Independence quadrangle, California". Journal of Paleontology. 34 (5): 862–873. ISSN 0022-3360. JSTOR 1301012. Wikidata Q96655687.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.
- "Johnson Spring Formation". USGS Geologic Names Committee Archives. USGS. Retrieved June 26, 2020.
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