Geologic Formations of the San Joaquin Valley  
ERA Epoch Strat Units
  Holocene ALLUVIUM
Pleistocene TULARE FM
(under construction)
Pliocene SAN JOAQUIN FM
(Under Construction)
ETCHEGOIN FM
(Under Construction)
Miocene Upper REEF RIDGE
BELRIDGE DIATOMITE
ANTELOPE
MCDONALD
Middle DEVILWATER
GOULD
MEDIA
Lower
CARNEROS
UPPER SANTOS
Oligocene AGUA
LOWER SANTOS
PHACOIDES
 
SALT CREEK
 
CYMRIC SHALE
TUMEY
Eocene Upper
OCEANIC
Middle
KREYENHAGEN
POINT of ROCKS
KREYENHAGEN
CANOAS
Lower YOKUT
GATCHELL
ARROYO HONDO
CANTUA
 
 
 
   
Paleocene Upper
DOMENGINE
UNCONFORMITY
                                               (Missing Section)
WHEATVILLE
Lower
Cretaceous
BLEWETT
 
RAGGED VALLEY
TRACY
BROWN MOUNTAIN
 
SAWTOOTH
LATHROP  
JOAQUIN RIDGE
 
 
FORBES
BASEMENT
 
           

 

Formation names that are highlighted in blue are linked to a more
detailed description of the formation. Unfortunately the stratigraphy
of the San Joaquin Valley is rather complicated, and it can be quite
confusing. The stratigraphy shown here is greatly simplified.

SJV Strat Section.xls

 

Lithostratigraphic Column

 

Below is Geologic Time Chart, but due to space considerations it is not
drawn to scale. However, the link below does lead to a more detailed
Time Chart that is specific to California.

California Geologic Time Scale

Geologic Time Chart



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