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 | ![]() |
Type section | |
Named by | Harold Richard Pestana [2] |
The Johnson Spring Formation is a geologic formation in California. [3] It preserves fossils dating back to the Ordovician period. [4]
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]
The Bull Fork Formation is a geologic formation in north central Kentucky and southwestern Ohio. It preserves fossils dating back to the Ordovician period.
The Oranda Formation is a geologic formation in Virginia. It preserves fossils dating back to the Ordovician period.
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The Ely Springs Dolomite is an Ordovician period geologic formation in the Southwestern United States.
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The Wood Canyon Formation is a geologic formation in the northern Mojave Desert of Inyo County, California and Nye County and Clark County, Nevada.
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The Badger Flat Limestone is a limestone geologic formation in California.
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The Etchegoin Formation is a Pliocene epoch geologic formation in the lower half of the San Joaquin Valley in central California.
The Coso Formation is a geologic formation in the Coso Range of the Mojave Desert, in Inyo County, California.
The Chanac Formation is a Cenozoic Era sandstone geologic formation in the southeastern San Joaquin Valley, within Kern County, California.
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The Becscie Formation is a geologic formation in Quebec. It preserves fossils dating back to the early Silurian period.