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San Francisquito Formation information


San Francisquito Formation
Stratigraphic range: Maastrichtian-Danian
~70–62 Ma
PreꞒ
O
S
D
C
P
T
J
K
Pg
N
TypeGeologic formation
UnderliesCastaic & Punchbowl Formations
OverliesSan Gabriel Basement Complex
Thickness4 km (13,000 ft)
Lithology
PrimarySandy shale
Location
Coordinates34°36′N 118°36′W / 34.6°N 118.6°W / 34.6; -118.6
Approximate paleocoordinates39°30′N 96°30′W / 39.5°N 96.5°W / 39.5; -96.5
RegionLos Angeles County, California
CountrySan Francisquito Formation United States
ExtentSan Gabriel Mountains & Sierra Pelona Mountains
San Francisquito Formation is located in the United States
San Francisquito Formation
San Francisquito Formation (the United States)
San Francisquito Formation is located in California
San Francisquito Formation
San Francisquito Formation (California)

The San Francisquito Formation is a geologic formation located in northern Los Angeles County, California.[1][2]

Areas where it is exposed include: San Francisquito Canyon of the Sierra Pelona Mountains, as well as on the northwestern side of the Devil's Punchbowl gorge in the San Gabriel Mountains.[1][2]

  1. ^ a b Seismo.berkeley.edu: Field Guide to the Punchbowl Fault Zone, at Devil's Punchbowl Los Angeles County Park; San Andreas Fault Resources; University of California, Berkeley; by Frederick M. Chester; January 1999.
  2. ^ a b AAPG Datapages/Archives: "Stratigraphy and Sedimentology of the Type San Francisquito Formation, Southern California"; Department of Earth Sciences, University of California, Riverside; 1982.

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