Moraga Formation
The Moraga Formation or Moraga Volcanics is a Pliocene epoch volcanic geologic formation in the Berkeley Hills of the East Bay region of the San Francisco Bay Area, California.

The basaltic lava flow formation is found within Alameda County and Contra Costa County. It can be seen in the Robert Sibley Volcanic Regional Preserve and Caldecott Tunnel area of the Berkeley Hills. It is named for an exposed occurrence in the Moraga Valley.

It overlies the Orinda Formation, and underlies the Siesta Formation of Great Valley Group.

;Fossils
It preserves freshwater fossils dating back to the Pliocene epoch of the Neogene period.
Q76259
Pliocene epoch
MEDIA
Q736917
geologic formation
Concept
Q4892037
Berkeley Hills
LOC
Q2617944
East Bay
LOC
Q213205
San Francisco Bay Area
LOC
Q99
California
LOC
Q764372
basaltic lava
Concept
Q107146
Alameda County
LOC
Q108058
Contra Costa County
LOC
Q7349780
Robert Sibley Volcanic Regional Preserve
LOC
Q5018994
Caldecott Tunnel
LOC
Q594122
Moraga Valley
LOC
Q18158266
Orinda Formation
LOC
Q18151974
Great Valley Group
LOC
Q40614
fossils
Concept
Q103924
Neogene
LOC
Q392928
period
Concept
Q18155693
Moraga Formation
LOC
instance of
underlies
located in the administrative territorial entity
located in the administrative territorial entity
part of
located in the administrative territorial entity
instance of