| DESCRIPTION OF MAP UNITS |
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Artificial fill |
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Dredge or mine tailings |
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Alluvium |
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Natural levee and channel deposits |
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Basin deposits (Alluvium) |
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Landslide deposits |
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Lake deposits |
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Fan deposits |
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Terrace deposits |
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Glacial deposits |
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Modesto Formation (Alluvium) |
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Riverbank Formation (Alluvium) |
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Pleistocene nonmarine sedimentary rocks |
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Red Bluff Formation |
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Pleistocene
volcanic rocks (b-basalt, bp-scoria and tuff) |
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Volcanic sediments of Sutter Buttes QPI-Volcanic
lake beds |
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Volcanic
rocks of Sutter Buttes (a-andesite,
r-rhyolite) |
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Tuffs of Oroville Pnt-Nomlaki Tuff |
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Tuscan Formation Pnt-Nomlaki Tuff |
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Laguna Formation |
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Pliocene nonmarine sedimentary rocks |
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Pliocene intrusive rocks (a-andesite, b-basalt) |
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Pliocene volcanic rocks (a-andesite, b-basalt) |
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Cinder cone or
volcano; major Pelean domes at Sutter Buttes |
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Miocene-Pliocene channel deposits |
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Sutter Formation |
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Miocene-Pliocene intrusive rocks (a-andesite, b-basalt)
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Miocene-Pliocene volcanic rocks (b-basalt, a-andesite,
af-andesite flows, ap-andesite pyroclastics, t-dacitic tuff-breccia) |
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Lovejoy Basalt |
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Oligocene-Miocene volcanic rocks (r-rhyolite tuff and sediments) |
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Capay Formation |
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Ione Formation |
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"Auriferous" Gravels |
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Upper Cretaceous rocks |
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Chico Formation |
| MESOZOIC
PLUTONIC ROCKS |
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Granite, granodiorite |
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Quartz diorite, tonalite, trondhjemite, quartz
monzonite |
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Diorite |
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Gabbro |
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Granite, granodiorite |
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Quartz diorite, trondhjemite |
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Diorite |
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Gabbro |
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Ultramafic rocks |
| SMARTVILLE
COMPLEX & CENTRAL BELT |
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Mariposa Formation |
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Logtown Ridge Formation |
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Monte de Oro Formation |
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Jurassic volcanic rocks |
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Volcanic rocks |
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Quartz diorite and tonalite |
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Dike complex |
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Gabbroic rocks |
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Massive diabase |
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Ultramafic rocks |
| PALEOZOIC
AND MESOZOIC ROCKS |
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MzPz -
Undifferentiated
lc - Lake Combie complex
sc - Slate Creek complex |
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Metasedimentary rocks |
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Metavolcanic rocks |
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Volcaniclastic sediments |
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Chert and chert breccia |
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Limestone and marble |
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Massive diabase |
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Metadiorite |
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Gabbro |
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Ultramafic rocks |
| FEATHER
RIVER PERIDOTITE BELT |
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Metamorphic rocks of
unknown age
mv - blueschist bearing metavolcanic rocks |
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Calaveras Complex
Pzcv - Metavolcanic rocks
ls - limestone |
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Paleozoic amphibolite |
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Peridotite
of Melones fault zone
Pzgb - Gabbro |
| EASTERN
BELT (Northern
Sierra terrane) |
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Jurassic (?)
metamorphic rocks
Jms - Metasedimentary rocks
Jmv - Metavolcanic rocks
Jmvs - Undivided metasedimentary and metavolcanic rocks |
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Sailor Canyon Formation
Jls - Limestone and marble |
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Triassic metasedimentary rocks
Trls - Limestone |
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Permian and Triassic
rocks
ls - limestone |
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Reeve Formation |
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Goodhue Formation |
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Peale
Formation |
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Taylor
Formation |
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Sierra
Buttes Formation |
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Bowman Lake Batholith
Dbt - Trondhjemite, tonalite
Dbg - Granite, granodiorite |
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Grizzly
Formation |
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Shoo Fly Complex |
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Sandstone, siltstone, and slate |
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Greenstone |
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Chert
and chert breccia |
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Limestone
and marble |
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Gabbro
and diabase |
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Serpentinized
ultramafic rocks |
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Undifferentiated melange |
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Paleozoic
rocks of uncertain age and correlation |
| MAP
SYMBOLS |
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Contact |
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Fault |
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Thrust fault |
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Anticlinal fold |
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Synclinal fold |
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Monoclinal fold |
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Strike and dip of beds |
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Vertical beds |
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Strike and dip of overturned beds |
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Strike and dip of foliation |
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Vertical foliation |
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Strike and dip of dikes |
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