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]

See also

• Earth sciences portal
• United States portal
• Paleontology portal

• List of fossiliferous stratigraphic units in California
• Paleontology in California