Geologic Map of the Lake Tahoe Basin, California and Nevada


'' Identification Information
Data Quality Information
Spatial Data Organization Information
Spatial Reference Information
Entity and Attribute Information
Distribution Information
Metadata Reference Information







''

Identification Information

 Section Index

'' Citation:
'' Citation Information:
'' Originator: George J. Saucedo
Publication Date: 2005
Title: Geologic Map of the Lake Tahoe Basin, California and Nevada
Edition: Version 1.0
Series Information:
'' Series Name: Regional Geologic Map Series, 1:100,000 Scale
Issue Identification: RGM Map No. 4


'' Publication Information:
'' Publication Place: Sacramento, California
Publisher: Department of Conservation, California Geological Survey


'' Other Citation Details: Digitized by Jason D. Little, Sarah E. Watkins, Jennifer R. Davis, Marina T. Mascorro, Victoria D. Walker, and Eric W. Ford
This compilation was the result of a collaborative effort of the California Geological Survey, the U.S. Geological Survey, and the Nevada Bureau of Mines and Geology.








''
'' Description:
'' Abstract: ''The Geologic Map of the Lake Tahoe Basin, California and Nevada is a digital database compiled from geologic maps covering all of the Lake Tahoe Basin area. The compilation was prepared in segments using 7.5-minute quadrangle boundaries. The immediate objective of this project was to compile the most recent and representative geologic mapping and establish a seamless geologic database to be used by planning and decision-making agencies in the Lake Tahoe Basin. '' Purpose: To provide basic geologic information to those concerned with land use planning and decision-making in this part of California.
Supplemental Information: ''The geographic information system (GIS) files in this data package were created using ESRI ArcGIS 10. The *.gdb file is an ESRI File Geodatabase, version 10.0. The *.shp files are ESRI Shapefiles which were exported from the file geodatabase using ArcMap's "export" functionality. The *.dbf, *.prj, *.sbn and *.shx files support the *.shp files and contain necessary and important data that are referenced by the *.shp file. The *.mxd file is an ESRI Map Document file, which controls the display of data from the ESRI geodatabase, in this case using the same colors and symbols as the printed map. The ArcMap Map Documents and the ESRI File Geodatbase can be opened only with ESRI ArcGIS 10.0 or later. The ESRI Shapefiles can be opened with a wide variety of commercial and open-source GIS software, including Geomedia, GRASS GIS, MapInfo and Quantum GIS. The Shapefiles and Geodatabase contain the same geologic data. ''
'' Time Period of Content:
'' Time Period Information:
'' Single Date/Time:
'' Calendar Date:

''
'' Currentness Reference: Publication Date


'' Status:
'' Progress: Complete
Maintenance and Update Frequency: Irregular


'' Spatial Domain:
'' Bounding Coordinates:
'' West Bounding Coordinate: -120.25
East Bounding Coordinate: -119.86
North Bounding Coordinate: 39.375
South Bounding Coordinate: 38.625




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'' Keywords:
'' Theme:
'' Theme Keyword Thesaurus: none
Theme Keyword: 100k
Theme Keyword: Geologic map
Theme Keyword: Tahoe
Theme Keyword: Geology
Theme Keyword: Bedrock
Theme Keyword: Faults
Theme Keyword: Maps








'' Place:
'' Place Keyword Thesaurus: none
Place Keyword: Lake Tahoe Basin
Place Keyword: Placer, El Dorado, Washoe and Douglas Counties
Place Keyword: California and Nevada
Place Keyword: USA





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Access Constraints: To ensure currentness, this dataset must be obtained from the Department of Conservation, California Geological Survey.

Use Constraints: ''Upon receipt of this data set, all users are subject to copyright restrictions as follows: copyright 2012 Department of Conservation, California Geological Survey. All rights reserved. No part of this dataset may be reproduced, transmitted, or distributed in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of the California Geological Survey except as follows. Permission is granted to reproduce under the following conditions: 1) for personal use, 2) for publication in a report in unmodified form; cite on figure or in text as "Reproduced with permission from [title], [authors], [date], California Geological Survey", and 3) for publication in a report in modified form; cite on figure or in text as "Modified from [title], [authors], [date], California Geological Survey". (See above for appropriate title, authors, and date.)



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Data Set Credit: Department of Conservation, California Geological Survey; Nevada Bureau of Mines and Geology



Data Quality Information

 Section Index

'' Attribute Accuracy:
'' Attribute Accuracy Report: Data were checked against the original source materials by the author(s).
Quantitative Attribute Accuracy Assessment:
'' Attribute Accuracy Explanation: ''Although every effort was made to maintain and ensure the accuracy of this dataset, several potential sources of error remain. Users of this dataset should be aware of the difference between precision and accuracy. While digital data can be reproduced precisely at any scale, the accuracy of the data remains constant. '' ''

'' Logical Consistency Report: Map elements were visually checked by the author(s) for errors.
Completeness Report: Some simplification was necessary to make a legible map at the 1:100,000 scale.
Positional Accuracy:
'' Horizontal Positional Accuracy:
'' Horizontal Positional Accuracy Report: ''Most or all of the data in this map were digitized from hard copy maps. Users of this dataset should be aware of the inherent potential for error in the processes of plotting, drafting, and digitization. For example, a plotting error of one line width equal to 0.5 mm at 1:100,000 scale could cause a location error of approximately 50 meters on the ground. '' ''
'' Lineage:
'' Process Step:
'' Process Description: '' This map was compiled and digitized from existing, published and unplublished, geologic maps covering the area. Hard-copy maps were digitized by hand, either by scanning and on-screen digitizing, or by placing the map on a tablet and digitizing.

'' Process Date: 2002-2005

'' Process Step:
'' Process Description: '' ARC/INFO database converted to ESRI File Geodatabase format, version 10.0.

'' Process Date: 2012

''

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Spatial Data Organization Information

 Section Index

Direct Spatial Reference Method: Point and Vector



Spatial Reference Information

 Section Index

'' Horizontal Coordinate System Definition:
'' Planar:
'' Grid Coordinate System:
'' Grid Coordinate System Name: Universal Transverse Mercator 1927
Universal Transverse Mercator:
'' UTM Zone Number: 10
Transverse Mercator:
Longitude of Central Meridian: -123.00
Latitude of Projection Origin: 0.00
False Easting: 500000.00
False Northing: 0.00






''

''
'' Planar Coordinate Information:
'' Planar Coordinate Encoding Method: Coordinate Pair
''Abscissa Resolution: 0.0001
Ordinate Resolution: 0.0001

'' Planar Distance Units: meters


''

'' Geodetic Model:
'' Horizontal Datum Name: North American Datum of 1927
Ellipsoid Name: Clarke 1866
Semi-major Axis: 6378206
Denominator of Flattening Ratio: 294.9786982




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Entity and Attribute Information

 Section Index

'' Overview Description:
'' Entity and Attribute Overview:

''This electronic database contains ArcGIS Feature Classes representing the following layers:
(Note: these Feature Classes have also been exported as ESRI Shapefiles)

Geologic Annotation: TahoeBasin_geo_anno
''Labels for geologic features (e.g. map units, fault names).''
Geologic Lines: TahoeBasin_geo_arc
''Lines representing faults and contacts between geologic units.''
Geologic Polygons: TahoeBasin_geo_poly
''Polygons representing geologic units.''
Landslide Arrows: TahoeBasin_lsl_arc
''Lines indicating landslide direction of movement.''
Leader Lines: TahoeBasin_leaders
''Leader lines for annotation features in the TahoeBasin_geo_anno.''
Moraine Crest Lines: TahoeBasin_mcrest_arc
''Lines representing moraine crests.''
Structure Annotation: TahoeBasin_str_anno
''Annotation for structural features (e.g. dip values).''
Structure Lines: TahoeBasin_str_arc
''Lines representing fold axes.''
Structure Points: TahoeBasin_str_point
''Point representing structural measurements (e.g. orientation of bedding).''

This electronic database also contains one non-spatial table:

Description_of_Map_Units ''Table containing the lithologic information in the Description of Map Units included in the published geologic map and/or pamphlet. This table can be related to the TahoeBasin_geo_poly Feature Class using the PTYPE field.''



























'' Entity and Attribute Detail Citation: ''
Feature Class: TahoeBasin_geo_arc
LTYPE field records Line Types; possible LTYPE field values:
'' ca_nv stateline
contact, approx. located
contact, certain
contact, concealed
contact, gradational
contact, inferred
contact, inferred, queried
dam
dike, andesite
dike, basalt
dike, latite
dike, mafic
fault, approx. located
fault, approx. located or inferred
fault, certain
fault, concealed
fault, concealed, queried
fault, inferred
fault, inferred, queried
map boundary
scratch boundary
thrust fault, approx. located
thrust fault, certain
water boundary




























'' Feature Class: TahoeBasin_geo_poly
PTYPE field records Polygon Types; possible PTYPE field values: '' af: Artificial fill (late Holocene)
ap: Aplite and pegmatite dikes (Cretaceous)
bd: Basalt dikes (Cretaceous)
Ja: Anorthosite (Late? and Middle Jurassic)
Jaqd: Quartz diorite at Azure Lake (Late? and Middle Jurassic)
Jdg: Diorite and gabbro (Late? and Middle Jurassic)
Jdi: Diorite (Jurassic?)
Jlb: Lake Tahoe Sequence of Harwood, Blackwood Creek Formation (Jurassic)
Jle: Lake Tahoe Sequence of Harwood, Ellis Peak Formation (Jurassic)
Jlp: Lake Tahoe Sequence of Harwood, Pelite unit (Jurassic?)
Jmd: Microdiorite dikes of Sabine (1992) (Jurassic)
Jmib: Mafic intrusive breccia (Late? and Middle Jurassic)
Jpgr: Pyramid Peak granite (Jurassic)
Jsc: Sailor Canyon Formation (Middle and Early Jurassic)
Jtlb: Tuttle Lake Formation of Harwood, Volcanic breccia
Jtld: Tuttle Lake Formation of Harwood, Diamictite
Jtlf: Tuttle Lake Formation of Harwood, Lava flows
Jtls: Tuttle Lake Formation of Harwood, Tuffaceous sandstone and conglomerate
JTrm: Metamorphic rocks (Jurassic and (or) Triassic)
JTrms: Metasedimentary rocks (Jurassic and (or) Triassic)
JTrmv: Metavolcanic rocks (Jurassic and (or) Triassic)
Kbla: Burnside Lake adamellite of Parker (1961) (Cretaceous)
Kbmg: Bryan Meadow granodiorite (Cretaceous)
Kbp: Breccia pipe (Cretaceous?)
Kcfg: Camper Flat granodiorite (Cretaceous or Jurassic?)
Kcld: Diorite of Caples Lake (Cretaceous)
Kclg: Granodiorite of Caples Lake (Cretaceous)
Kcpt: Carson Pass tonalite of Parker (1961) (Cretaceous)
Kcvg: Granodiorite of Charity Valley (Cretaceous)
Kdg: Diorite and gabbro (Cretaceous)
Kdpg: Granodiorite of Daggett Pass (Cretaceous)
Kdlg: Dicks Lake granodiorite (Cretaceous)
Kdqd: Quartz monzodiorite north of Daggett Pass (Cretaceous?)
Kdvg: Desolation Valley granodiorite (Cretaceous or Jurassic?)
Keg: Granodiorite of East Peak (Cretaceous)
Kelg: Echo Lake granodiorite (Cretaceous)
Kepg: Ebbetts Pass granodiorite of Wilshire (1957) (Cretaceous)
Kfpg: Freel Peak granodiorite (Cretaceous)
Kfvg: Granodiorite of Faith Valley (Cretaceous)
Kgag: Glen Alpine granodiorite (Cretaceous)
Kgqd: Quartz diorite of Grass Lake (Cretaceous)
Kgr: Ganite and granodiorite, undivided (Cretaceous)
KJdg: Diorite and gabbro (Cretaceous and (or) Jurassic)
KJgd: Granodiorite (Cretaceous and (or) Jurassic)
KJgr: Granite (Cretaceous and (or) Jurassic)
Kkgg: Granodiorite of Kingsbury Grade (Cretaceous)
Kklg: Granodiorite of Kinney Lakes (Cretaceous)
Kkqm: Keiths Dome quartz monzonite (Cretaceous or Jurassic?)
Kllg: Lovers Leap granodiorite (Cretaceous)
Kppg: Phipps Pass granodiorite (Cretaceous)
Kqd: Quartz diorite and diorite (Cretaceous)
Krpa: Alaskite at Rubicon Point (Cretaceous)
Krvg: Rockbound Valley granodiorite (Cretaceous)
Ksgr: Monzogranite of Spooner Summit of Grose (1985) (Cretaceous)
Ktcg: Granodiorite of Thornburg Canyon (Cretaceous)
Ktlg: Tyler Lake granodiorite of Sabine (1992) (Cretaceous)
Kwlg: Wrights Lake granodiorite (Cretaceous)
Kwpg: Granodiorite of Waterhouse Peak (Cretaceous)
Kwpt: Tonalite West of Waterhouse Peak (Cretaceous)
Mia: Intrusive rocks, andesite (Miocene)
Mib: Intrusive rocks, basalt (Miocene)
Mir: Intrusive rocks, rhyolite (Miocene)
Mls: Lake Tahoe Sequence of Harwood, Serena Creek Formation (Mississippian? or younger)
Mva: Undivided andesitic and dacitic lahars, flows, breccia and volcaniclastic sediments (Miocene)
Mvaf: Andesite and dacite flows (Miocene)
Mvbf: Basalt flows (Miocene)
Mvgf: Glenbrook volcanic center, trachyte flows (Miocene)
Mvgi: Glenbrook volcanic center, latite intrusions (Miocene)
Mvgt: Glenbrook volcanic center, vitric-crystal tuff (Miocene)
Mvll: Andesitic lahars (Miocene)
Mvlla: Andesite flows (Miocene)
Mvs: Fluvial deposits (Miocene)
Mvul: Andesitic lahars (Miocene)
Mvula: Andesite flows (Miocene)
Mvulp: Pumiceous tuff (Miocene)
Mvulr: Rockslide-avalanche deposits (Miocene)
?c: Conglomerate and breccia (Oligocene and (or) older Tertiary)
?Mvr: Rhyolite tuff (Oligocene and Miocene?)
Pia: Dikes and intrusives, andesite (Pliocene)
Pib: Dikes and intrusives, olivine basalt (Pliocene)
Ps: Fluvial and lacustrine deposits (Pliocene)
Pva: Andesite and basaltic andesite flows (Pliocene)
Pvah: Alder Hill basalt of Birkeland (1961) (Pliocene)
Pvahcc: Alder Hill basalt of Birkeland (1961), cinder cone deposits (Pliocene)
Pval: Andesite lahars (Pliocene)
Pvb: Basalt flows (Pliocene)
Pvp: Polaris olivine latite of Birkeland (1961) (Pliocene)
Pvpt: Polaris olivine latite of Birkeland (1961), latite tuff and tuff breccia (Pliocene)
Pvta: Tahoe City trachyandesite of Wise and Sylvester (2004) (Pliocene)
Pvtb: Tahoe City basalt of Wise and Sylvester (2004) (Pliocene)
Pvtcc: Tahoe City trachyandesite of Wise and Sylvester (2004), cinder cone deposits (Pliocene)
Q: Alluvium (Holocene and Pleistocene)
Qb: Beach deposits (Holocene)
Qc: Colluvium (Holocene)
Qf: Alluvial fan deposits (Holocene and Pleistocene)
Qfp: Flood-plain deposits (Holocene)
Qg: Glacial deposits, undivided, Till
Qgo: Glacial deposits, undivided, Outwash deposits
Qgt: Tahoe and Tioga glacial deposits, Till (Pleistocene)
Qjf: Juniper Flat alluvium of Birkeland (1961) (Pleistocene)
Ql: Lake deposits (Holocene)
Qls: Landslide deposits (Holocene and Pleistocene)
Qlt: Lacustrine terrace deposits (Pleistocene)
Qm: Mudflow deposits of Birkeland (1961) (Holocene and (or) Pleistocene)
Qob: Older beach deposits (Pleistocene)
Qog: Old glacial deposits, Till
Qogo: Old glacial deposits, Outwash deposits
Qol: Older lake deposits (Pleistocene)
Qpc: Prosser Creek alluvium of Birkeland (1961) (Pleistocene)
QPia: Unnamed intrusive rocks, andesite and latite (Pliocene and (or) Pleistocene)
Qpib: Unnamed intrusive rocks, basalt (Pliocene and (or) Pleistocene)
QPot: Older talus deposits (Pliocene and (or) Pleistocene)
QPs: Unnamed gravels, sand and alluvium (Pliocene and (or) Pleistocene)
QPvb: Unnamed volcanic rocks (Pliocene and (or) Pleistocene)
QPvb, maar: Unnamed volcanic rocks, maar deposits (Pliocene and (or) Pleistocene)
QPvbc: Big Chief basalt of Birkeland (1961) (Pliocene and (or) Pleistocene)
QPvbu: Burton Creek basalt of Wise and Sylvester (2004) (Pliocene and (or) Pleistocene)
QPvd1: Dry Lake volcanic flows of Birkeland (1961) and Wise and Sylvester (2004), oldest (Pliocene and (or) Pleistocene)
QPvd2: Dry Lake volcanic flows of Birkeland (1961) and Wise and Sylvester (2004) (Pliocene and (or) Pleistocene)
QPvd3: Dry Lake volcanic flows of Birkeland (1961) and Wise and Sylvester (2004) (Pliocene and (or) Pleistocene)
QPvd4: Dry Lake volcanic flows of Birkeland (1961) and Wise and Sylvester (2004), youngest (Pliocene and (or) Pleistocene)
QPvlf: Lake Forest basalt of Wise and Sylvester (2004) (Pliocene and (or) Pleistocene)
QPvpm: Page Meadow basalt of Wise and Sylvester (2004) (Pliocene and (or) Pleistocene)
Qt: Talus deposits (Holocene)
Qta: Tahoe glacial deposits, Till (Pleistocene)
Qtao: Tahoe glacial deposits, Outwash deposits (Pleistocene)
Qti: Tioga glacial deposits, Till (Pleistocene)
Qtio: Tioga glacial deposits, Outwash deposits (Pleistocene)
Qvbm: Bald Mountain olivine latite of Birkeland (1961) (Pleistocene)
Qvbmcc: Bald Mountain olivine latite of Birkeland (1961), cinder cone deposits (Pleistocene)
Qvh: Hirschdale olivine latite of Birkeland (1961) (Pleistocene)
Qvhcc: Hirschdale olivine latite of Birkeland (1961), cinder cone deposits (Pleistocene)
Qvht: Hirschdale olivine latite of Birkeland (1961), basaltic tuff (Pleistocene)
Qyg: Younger glacial deposits (Holocene)
rocks: Undifferentiated rocks exposed in lake
Trls: Trls Limestone (Late Triassic?)
water: water
water, maar: Maar submerged beneath lake water










































































































































''

Feature Class: TahoeBasin_lsl_arc
LTYPE field records Line Types; possible LTYPE field values: '' landslide arrow

''

Feature Class: TahoeBasin_str_arc
LTYPE field records Line Types; possible LTYPE field values: '' anticline, certain
syncline, certain


''

Feature Class: TahoeBasin_str_point
PTTYPE field records Point Types; possible PTTYPE field values: '' ball and bar
bedding
bedding with tops
bedding, overturned
bedding, vertical
cleavage
cleavage parallel to bedding
cleavage parallel to bedding, with tops
cleavage, vertical
foliation
foliation, igneous
foliation, igneous, vertical
foliation, vertical
joint
joint, vertical
plunge arrow
















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Distribution Information

 Section Index

'' Distributor:
'' Contact Information:
'' Contact Organization Primary:
'' Contact Organization: Department of Conservation, California Geological Survey

'' Contact Address:
'' Address: P.O. Box 2980
City: Sacramento
State or Province: CA
Postal Code: 95812-2980




''

''
'' Distribution Liability: ''The data in this package are provided by the Department of Conservation, California Geological Survey, as is. Any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. In no event shall the Department of Conservation, California Geological Survey, or its associated contributors be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data, or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) that arise in any way out of the use of these data, even if advised of the possibility of such damage.

Although the data in this package have been produced and processed by professional scientists and organizations, the Department of Conservation, California Geological Survey, makes no warranty, express or implied, regarding the data or its use. The Department of Conservation, California Geological Survey, shall not be held liable for improper or incorrect use of the data described and/or contained herein.





'' Standard Order Process:
'' Digital Form:
'' Digital Transfer Information:
'' Format Name: ESRI File Geodatabase and ESRI Shape Files
Format Version Number: 10.0


'' Digital Transfer Option:
'' ''

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'' Available Time Period:
'' Time Period Information:
'' Single Date/Time:
'' Calendar Date:

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Metadata Reference Information

 Section Index

'' Metadata Date: 11/01/2012
Metadata Review Date:
Metadata Future Review Date: N/A
Metadata Contact:
'' Contact Information:
'' Contact Person Primary:
'' Contact Person: Chris Wills
Contact Organization: Department of Conservation, California Geological Survey


'' Contact Position: Supervising Engineering Geologist
Contact Address:
'' Address Type: mailing and physical address
Address: 801 K St. MS 12-32
City: Sacramento
State or Province: California
Postal Code: 95814-3531
Country: USA






'' Contact Voice Telephone: (916) 323-8553
Contact Facsimile Telephone:
Contact Electronic Mail Address: Chris.Wills@conservation.ca.gov






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