| DESCRIPTION OF MAP UNITS |
|
|
Artificial fill (late Holocene) |
 |
Beach deposits (Holocene) |
|
Flood-plain deposits (Holocene) |
 |
Talus deposits (Holocene) |
 |
Lake deposits (Holocene) |
 |
Younger glacial deposits (Holocene) |
 |
Colluvium (Holocene) |
 |
Landslide deposits (Holocene and Pleistocene) |
 |
Alluvium (Holocene and Pleistocene) |
 |
Alluvial fan deposits (Holocene and Pleistocene) |
 |
Mudflow deposits (Holocene and (or) Pleistocene) |
 |
Older beach deposits (Pleistocene) |
 |
Older lake deposits (Pleistocene) |
 |
Lacustrine terrace deposits (Pleistocene) |
| Tioga glacial
deposits (Pleistocene) |
 |
Till |
 |
Outwash deposits |
| Tahoe glacial
deposits (Pleistocene) |
 |
Till |
 |
Outwash deposits |
| Tahoe and Tioga
glacial deposits - undivided
(Pleistocene) |
 |
Till |
| Older glacial
deposits - pre-Tahoe deposits
(Pleistocene) |
 |
Till |
 |
Outwash deposits |
| Glacial deposits
undivided (Pleistocene and
Holocene?) |
 |
Till |
 |
Outwash deposits |
 |
Bald Mountain olivine latite of Birkeland (1961)
(Pleistocene)
Qvbmcc - cinder cone deposits |
 |
Juniper Flat alluvium of Birkeland (1961)
(Pleistocene) |
 |
Prosser Creek alluvium of Birkeland (1961)
(Pleistocene) |
 |
Hirschdale olivine latite of Birkeland (1961)
(Pleistocene)
Qvhcc - cinder cone deposits; Qvht - basaltic tuff |
 |
Older talus deposits (Pliocene and (or)
Pleistocene) |
 |
Dry Lake volcanic flows of Birkeland (1961); Wise
and Sylvester (2004)QPvd (Pliocene and (or) Pleistocene) - QPvd1 -
QPvd4 (oldest to youngest) |
 |
Big Chief basalt of Birkeland (1961) (Pliocene
and (or) Pleistocene) |
 |
Page Meadow basalt of Wise and Sylvester (2004)
(Pliocene and (or)QPvpm Pleistocene) |
 |
Unnamed gravels, sand and alluvium (Pliocene and
(or) Pleistocene) |
 |
Burton Creek basalt of Wise and Sylvester (2004)
(Pliocene and (or)QPvbu Pleistocene) |
 |
Lake Forest basalt of Wise and Sylvester (2004)
(Pliocene and (or)QPvlf Pleistocene) |
| Unnamed volcanic
and intrusive rocks (Pliocene
and (or) Pleistocene) |
 |
Basalt flows, flow
breccia and basaltic ash |
 |
QPia - intrusive andesite and latite; QPib -
intrusive basalt |
 |
Tahoe City trachyandesite of Wise and Sylvester
(2004) (Pliocene)
Pvtcc - cinder cone deposits |
 |
Tahoe City basalt of Wise and Sylvester (2004)
(Pliocene) |
 |
Polaris olivine latite of Birkeland (1961)
(Pliocene)
Pvpt - latite tuff and tuff breccia |
 |
Alder Hill basalt of Birkeland (1961) (Pliocene)
Pvahcc - cinder cone deposits |
 |
Fluvial and lacustrine deposits (Pliocene) |
| Unnamed volcanic
and intrusive rocks (Pliocene) |
 |
Andesite and
basaltic andesite flows |
 |
Andesite lahars |
 |
Basalt flows - includes Boca Ridge flows of
Latham (1985) |
 |
Dikes and intrusives - Pia - andesite; Pib -
basalt |
| Unnamed volcanic
and intrusive rocks (Miocene) |
 |
Undivided andesitic
and dacitic lahars, flows,
breccia and volcaniclastic sediments |
 |
Andesite and dacite flows |
 |
Basalt flows |
 |
Fluvial deposits |
 |
Intrusive rocks - Mia - andesite, basaltic
andesite and latite;
Mib - basalt; Mir - rhyolite |
 |
Glenbrook volcanic center (Miocene) Mvgi - latite
intrusions;
Mvgt - vitric-crystal tuff; Mvgf - trachyte flows
and vent fill |
| Upper lahar
sequence of Harwood and Fisher (2002)
(Miocene) |
 |
Andesitic lahars |
 |
Andesite flows |
 |
Pumiceous tuff |
 |
Rockslide-avalanche deposits |
| Lower lahar
sequence of Harwood and Fisher (2002)
(Miocene) |
 |
Andesitic lahars |
 |
Andesite flows |
| Unnamed volcanic
and sedimentary rocks |
 |
Rhyolite tuff
(Oligocene and Miocene?) |
 |
Conglomerate and breccia (Oligocene and (or)
older Tertiary) |
| Granitic rocks |
 |
Aplite and pegmatite
dikes (Cretaceous) |
 |
Echo Lake granodiorite (Cretaceous) |
 |
Phipps Pass granodiorite (Cretaceous) |
 |
Bryan Meadow granodiorite (Cretaceous) |
 |
Lovers Leap granodiorite (Cretaceous) |
 |
Glen Alpine granodiorite (Cretaceous) |
 |
Tyler Lake granodiorite (Cretaceous) |
 |
Wrights Lake granodiorite (Cretaceous) |
 |
Dicks Lake granodiorite (Cretaceous) |
 |
Alaskite at Rubicon Point (Cretaceous) |
 |
Rockbound Valley granodiorite (Cretaceous) |
 |
Granodiorite of Waterhouse Peak (Cretaceous) |
 |
Quartz diorite of Grass Lake (Cretaceous) |
 |
Granodiorite of Kingsbury Grade (Cretaceous) |
 |
Tonalite West of Waterhouse Peak (Cretaceous) |
 |
Granodiorite of East Peak (Cretaceous) |
 |
Monzogranite of Spooner Summit of Grose (1985)
(Cretaceous) |
 |
Granodiorite of Thornburg Canyon (Cretaceous) |
 |
Granodiorite of Charity Valley (Cretaceous) |
 |
Diorite of Caples Lake (Cretaceous) |
 |
Granodiorite of Caples Lake (Cretaceous) |
 |
Freel Peak granodiorite (Cretaceous) |
 |
Burnside Lake adamellite of Parker (1961)
(Cretaceous) |
 |
Granodiorite of Daggett Pass (Cretaceous) |
 |
Carson Pass tonalite of Parker (1961) (Cretaceous) |
 |
Granodiorite of Faith Valley (Cretaceous) |
 |
Ebbetts Pass granodiorite of Wilshire (1957)
(Cretaceous) |
 |
Granodiorite of Kinney Lakes (Cretaceous) |
 |
Basalt dikes (Cretaceous) |
 |
Quartz monzodiorite north of Daggett Pass
(Cretaceous?) |
 |
Breccia pipe (Cretaceous?) |
 |
Camper Flat granodiorite (Cretaceous or Jurassic?) |
 |
Desolation Valley granodiorite (Cretaceous or
Jurassic?) |
 |
Keiths Dome quartz monzonite (Cretaceous or
Jurassic?) |
| Unnamed granitic
rocks of the Sierra Nevada
batholith |
 |
Granite and
granodiorite, undivided (Cretaceous) |
 |
Quartz diorite and diorite (Cretaceous) |
 |
Diorite and gabbro (Cretaceous) |
 |
Granite (Cretaceous and (or) Jurassic) |
 |
Granodiorite (Cretaceous and (or) Jurassic) |
 |
Diorite and gabbro (Cretaceous and (or) Jurassic) |
| Jurassic intrusive
rocks: |
 |
Quartz diorite at
Azure Lake (Late? and Middle
Jurassic) |
 |
Pyramid Peak granite (Jurassic) |
 |
Diorite (Jurassic?) |
 |
Diorite and gabbro (Late? and Middle Jurassic) |
 |
Microdiorite dikes (Jurassic) |
 |
Mafic intrusive breccia (Late? and Middle
Jurassic) |
 |
Anorthosite (Late? and Middle Jurassic) |
| Metamporhic rocks |
| Tuttle Lake
Formation of Harwood (1992) (Late?
and Middle Jurassic) |
 |
Lava flows |
 |
Volcanic breccia |
 |
Tuffaceous sandstone and conglomerate |
 |
Diamictite |
 |
Sailor Canyon Formation (Middle and Early
Jurassic) |
 |
Metamorphic rocks undivided (Jurassic and (or)
Triassic) |
 |
Metasedimentary rocks (Jurassic and (or) Triassic) |
 |
Metavolcanic rocks (Jurassic and (or) Triassic) |
 |
Limestone (Late Triassic?) |
| Lake Tahoe Sequence
of Harwood (1992) |
 |
Pelite unit
(Jurassic? |
 |
Ellis Peak Formation (Jurassic) |
 |
Blackwood Creek Formation (Jurassic) |
 |
Serena Creek Formation (Mississippian? or younger) |
MAP SYMBOLS
|
 |
Contact - solid where well or
approximately located;
dashed where inferred or gradational. |
 |
Fault
- solid where well located; dashed where
approximately located; short dash where inferred;
dotted where concealed; queried where continuation or
existence is uncertain. Ball and bar on downthrown side. |
 |
Thrust
fault - solid where well located; dashed
where approximately located. |
 |
Anticlinal
fold - arrow indicates plunge direction. |
 |
Synclinal
fold - arrow indicates plunge direction. |
 |
Glacial
moraine crest |
 |
Dikes
- andesite, latite, basalt and mafic dikes; dashed
where approximately located. |
 |
Arrows
on landslides indicate direction of movement. |
 |
Maar
at Lake Forest on the Kings Beach Quadrangle. |
| Strike and dip of stratified rocks. Number indicates dip angle in degrees when known |
 |
Inclined beds |
 |
Inclined beds - ball indicates top direction known |
 |
Vertical beds |
 |
Overturned beds |
| Strike and dip of metamorphic and igenous foliation and cleavage |
 |
Foliation or cleavage |
 |
Vertical foliation or cleavage |
 |
Cleavage parallel to bedding |
 |
Cleavage parallel to bedding - ball indicates top direction known |
 |
Joint |
 |
Vertical joint |
