Johnson Spring Formation

The Johnson Spring Formation is a geologic formation in California. It preserves fossils dating back to the Ordovician period. 
Previously described as undifferentiated upper part of Eureka group by Langenheim and others, Pestana formally named the formation in 1960. The Johnson Springs Formation underlies the Barrel Spring Formation and overlies the Ely Springs Dolomite.
The type section is in Lead Canyon Trail section of the Independence quadrangle, Inyo Mountains.