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
TypeFormation
Unit ofEureka Group[1]
UnderliesBarrel Spring Formation
OverliesEly Springs Dolomite
Thicknessbetween 114 feet (35 m) and 398 feet (121 m)[2]
Location
RegionInyo Mountains, California
Country U.S.A.
Type section
Named byHarold 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]

See also

References
  1. 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.
  2. Donald Clarence Ross (1966). "Stratigraphy of some Paleozoic formations in the Independence quadrangle, Inyo County, California" (PDF). Geological Survey Professional Paper. 396: 18. doi:10.3133/PP396. ISSN 0096-0446. Wikidata Q61048695.
  3. 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.
  4. Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
  5. "Johnson Spring Formation". USGS Geologic Names Committee Archives. USGS. Retrieved June 26, 2020.


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