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Geologic Map of the Weed Quadrangle



Geologic Map of the Weed Quadrangle


California Geological Survey, Regional Geologic Map No. 4A, 1:250,000 scale

Compilation by: D.L. Wagner and G.J. Saucedo

1987

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DESCRIPTION OF MAP UNITS

Dredge and mine tailings 
Alluvium
Landslide deposits
Dune and beach sand
Lake deposits
Shelf, slope, and basin deposits
Terrace deposits
Glacial deposits
Volcanic rocks (a-andesite; b-basalt; d-dacite; p-pyroclastic deposits; pb-Black Butte pyroclastic flow; ps-Shastina pyroclastic flow)
-
Cinder cone or volcano
Marine terrace deposits
Fluvial deposits
Volcanic rocks of Shasta Valley (a-andesite; p-pyroclastic deposits)
- Cinder cone or volcano
Battery Formation
Undifferentiated Plio-Pleistocene marine and non-marine deposits
St. George Formation
Volcanic rocks (a-andesite; b-basalt)
- Cinder cone or volcano
Marine mudstone undifferentiated
Tertiary gravels
Tertiary continental deposits
Wimer Formation
Western Cascade Volcanics (a-andesite with some basalt and dacite; p-andesite tuff breccia; t-rhyolite tuff; i-andesite and basalt intrusions and plugs; r-rhyolite domes)
Hornbrook Formation






Franciscan Complex * (ss-sandstone, shale, conglomerate; ch-chert; gs-greenstone and locally chert; mg-metagraywacke; sfm-South Fork Mountain Schist; rc-schist of Redwood Creek;
- blueschist blocks)
* - Horizontal pattern denotes melange terrane
Ultramafic rocks - partly to completely serpentinized
PLUTONIC ROCKS
Granitic rocks
Dioritic rocks
Ultramafic-gabbroic rocks
WESTERN JURASSIC BELT
Galice Formation
Volcanic rocks
Gabbro, diorite, and related rocks
Ultramafic rocks--partially to completely serpentinized
Condrey Mountain Schist
WESTERN PALEOZOIC AND TRIASSIC BELT
MzPz - Undifferentiated
rct-Rattlesnake Creek terrane
hft-Hayfork terrane
nft-North Fork terrane
Metasedimentary rocks
Metavolcaniclastic sedimentary rocks
Metavolcanic rocks
Conglomerate and sedimentary breccia
Chert
Limestone and marble
Gabbro
Serpentinite and metaserpentinite
Amphibolite and greenschist
Blueschist
Blueschist blocks
CENTRAL METAMORPHIC BELT
(Devonian or older)
Abrams Mica Schist
Salmon Hornblende Schist
EASTERN KLAMATH BELT
Potem Formation
Bagley Andesite
Arvison Formation
Modin Formation
Pit Formation
Bollibokka group
McCloud Limestone
Baird Formation
Bragdon Formation
Kennett Formation
Copley Greenstone
Gazelle Formation
Moffett Creek Formation
Duzel Formation
Antelope Mountain Quartzite
Ov-Mafic volcanic rocks and diabase
Ogb-Gabbroic and dioritic rocks
Op-Trinity peridotite
MAP SYMBOLS
Contact
Fault
Thrust fault
Anticlinal fold
Synclinal fold
Strike and dip of beds
Strike and dip of foliation
Blueschist blocks
Joints
(Prominent joints in granitic rocks of Castle Crags.)


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