Johnson Spring Formation
Geologic formation in California, United States
From Wikipedia, the free encyclopedia
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 | United States |
| 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]
