Johnson Spring Formation
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The Johnson Spring Formation is a geologic formation in California.[3] It preserves fossils dating back to the Ordovician period.[4]
Quick Facts Type, Unit of ...
Johnson Spring Formation | |
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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 | ![]() |
Type section | |
Named by | Harold Richard Pestana[2] |
Close
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]