This geologic map database is comprised of new geologic mapping, at a 1:24,000 scale, along the southern Bartlett Springs fault in the northern California Coast Ranges. The map covers an area of 258 square miles in Lake, Napa, Colusa, and Yolo counties, work was undertaken between 2016 and 2021, and supported by the USGS National Cooperative Geologic Map Program. This geodatabase contains the most up-to-date and highest resolution mapping in the region. Results and observations reported here help elucidate the geologic deformational history, as well as relationships between active older and active structures. Please consult the map pamphlet and description of map units for a detailed presentation and interpretation of data and discussion of results. The report and geodatabase contain two plates including the geologic map as well as a correlation of map units, four geologic cross sections, six microseismic cross sections, and a microseismicity fault map.

description: This geologic map database for the El Mirage Lake area describes geologic materials for the dry lake, parts of the adjacent Shadow Mountains and Adobe Mountain, and much of the piedmont extending south from the lake upward toward the San Gabriel Mountains. This area lies within the western Mojave Desert of San Bernardino and Los Angeles Counties, southern California. The area is traversed by a few paved highways that service the community of El Mirage, and by numerous dirt roads that lead to outlying properties. An off-highway vehicle area established by the Bureau of Land Management encompasses the dry lake and much of the land north and east of the lake. The physiography of the area consists of the dry lake, flanking mud and sand flats and alluvial piedmonts, and a few sharp craggy mountains. This digital geologic map database, intended for use at 1:24,000- scale, describes and portrays the rock units and surficial deposits of the El Mirage Lake area. It was prepared as part of a water-resource assessments of the area, describing and interpreting surface geology that provides information to help understand distribution and extent of deeper groundwater-bearing units. The area mapped covers the Shadow Mountains SE and parts of the Shadow Mountains, Adobe Mountain, and El Mirage 7.5-minute quadrangles. The map database includes detailed geology of surface and bedrock deposits, which represent a significant update from previous bedrock geologic maps by Dibblee (1960) and Troxel and Gunderson (1970), and the surficial geologic map of Ponti and Burke (1980); it incorporates a fringe of the detailed bedrock mapping in the Shadow Mountains by Martin (1992).; abstract: This geologic map database for the El Mirage Lake area describes geologic materials for the dry lake, parts of the adjacent Shadow Mountains and Adobe Mountain, and much of the piedmont extending south from the lake upward toward the San Gabriel Mountains. This area lies within the western Mojave Desert of San Bernardino and Los Angeles Counties, southern California. The area is traversed by a few paved highways that service the community of El Mirage, and by numerous dirt roads that lead to outlying properties. An off-highway vehicle area established by the Bureau of Land Management encompasses the dry lake and much of the land north and east of the lake. The physiography of the area consists of the dry lake, flanking mud and sand flats and alluvial piedmonts, and a few sharp craggy mountains. This digital geologic map database, intended for use at 1:24,000- scale, describes and portrays the rock units and surficial deposits of the El Mirage Lake area. It was prepared as part of a water-resource assessments of the area, describing and interpreting surface geology that provides information to help understand distribution and extent of deeper groundwater-bearing units. The area mapped covers the Shadow Mountains SE and parts of the Shadow Mountains, Adobe Mountain, and El Mirage 7.5-minute quadrangles. The map database includes detailed geology of surface and bedrock deposits, which represent a significant update from previous bedrock geologic maps by Dibblee (1960) and Troxel and Gunderson (1970), and the surficial geologic map of Ponti and Burke (1980); it incorporates a fringe of the detailed bedrock mapping in the Shadow Mountains by Martin (1992).

1:24,000 scale Geology of the South Lake Tahoe Quadrangle, Douglas County, Nevada, Alpine and Eldorado Counties, California, NBMG, South Lake Tahoe Folio 2Ag. Detailed geologic mapping by H. F. Bonham Jr., and J. L. Burnett. Geology of the South Lake Tahoe 7.5' Quadrangle, Douglas County, Nevada, Alpine and Eldorado Counties, California, with description of 25 geologic units. The GIS work was in support of the U.S. Geological Survey COGEOMAP program. The Geodatabase specifies feature datasets and feature classes, together with feature attributes, subtypes and domains, suitable for the printed geologic map. In addition to basic geology (lithology, contacts and faults, etc.), the maps may include metamorphic overprints, cross-sections, and explanatory legend-graphics such as correlation charts, used to supplement columnar legends.

NCED is currently involved in researching the effectiveness of anaglyph maps in the classroom and are working with educators and scientists to interpret various Earth-surface processes. Based on the findings of the research, various activities and interpretive information will be developed and available for educators to use in their classrooms. Keep checking back with this website because activities and maps are always being updated. We believe that anaglyph maps are an important tool in helping students see the world and are working to further develop materials and activities to support educators in their use of the maps.

This website has various 3-D maps and supporting materials that are available for download. Maps can be printed, viewed on computer monitors, or projected on to screens for larger audiences. Keep an eye on our website for more maps, activities and new information. Let us know how you use anaglyph maps in your classroom. Email any ideas or activities you have to ncedmaps@umn.edu

Anaglyph paper maps are a cost effective offshoot of the GeoWall Project. Geowall is a high end visualization tool developed for use in the University of Minnesota's Geology and Geophysics Department. Because of its effectiveness it has been expanded to 300 institutions across the United States. GeoWall projects 3-D images and allows students to see 3-D representations but is limited because of the technology. Paper maps are a cost effective solution that allows anaglyph technology to be used in classroom and field-based applications.

Maps are best when viewed with RED/CYAN anaglyph glasses!

A note on downloading: "viewable" maps are .jpg files; "high-quality downloads" are .tif files. While it is possible to view the latter in a web-browser in most cases, the download may be slow. As an alternative, try right-clicking on the link to the high-quality download and choosing "save" from the pop-up menu that results. Save the file to your own machine, then try opening the saved copy. This may be faster than clicking directly on the link to open it in the browser.

World Map: 3-D map that highlights oceanic bathymetry and plate boundaries.

Continental United States: 3-D grayscale map of the Lower 48.

Western United States: 3-D grayscale map of the Western United States with state boundaries.

Regional Map: 3-D greyscale map stretching from Hudson Bay to the Central Great Plains. This map includes the Western Great Lakes and the Canadian Shield.

Minnesota Map: 3-D greyscale map of Minnesota with county and state boundaries.

Twin Cities: 3-D map extending beyond Minneapolis and St. Paul.

Twin Cities Confluence Map: 3-D map highlighting the confluence of the Mississippi and Minnesota Rivers. This map includes most of Minneapolis and St. Paul.

Minneapolis, MN: 3-D topographical map of South Minneapolis.

Bassets Creek, Minneapolis: 3-D topographical map of the Bassets Creek watershed.

North Minneapolis: 3-D topographical map highlighting North Minneapolis and the Mississippi River.

St. Paul, MN: 3-D topographical map of St. Paul.

Western Suburbs, Twin Cities: 3-D topographical map of St. Louis Park, Hopkins and Minnetonka area.

Minnesota River Valley Suburbs, Twin Cities: 3-D topographical map of Bloomington, Eden Prairie and Edina area.

Southern Suburbs, Twin Cities: 3-D topographical map of Burnsville, Lakeville and Prior Lake area.

Southeast Suburbs, Twin Cities: 3-D topographical map of South St. Paul, Mendota Heights, Apple Valley and Eagan area.

Northeast Suburbs, Twin Cities: 3-D topographical map of White Bear Lake, Maplewood and Roseville area.

Northwest Suburbs, Mississippi River, Twin Cities: 3-D topographical map of North Minneapolis, Brooklyn Center and Maple Grove area.

Blaine, MN: 3-D map of Blaine and the Mississippi River.

White Bear Lake, MN: 3-D topographical map of White Bear Lake and the surrounding area.

Maple Grove, MN: 3-D topographical map of the NW suburbs of the Twin Cities.

Minnesota River: 3-D topographical map of the Minnesota River Valley highlighting the river bend in Mankato.

St. Croix River: 3-D topographical map of the St. Croix extending from Taylors Falls to the Mississippi confluence.

Mississippi River, Lake Pepin: 3-D topographical map of the confluence of Chippewa Creek and the Mississippi River.

Red Wing, MN: 3-D topographical map of Redwing, MN on the Mississippi River.

Winona, Minnesota: 3-D topographical map of Winona, MN highlighting the Mississippi River.

Cannon Falls, MN: 3-D topographical map of Cannon Falls area.

Rochester, MN: 3-D topographical map of Rochester and the surrounding area.

Northfield, MN: 3-D topographical map of Northfield and the surrounding area.

St. Louis River, MN: 3-D map of the St. Louis River and Duluth, Minnesota.

Lake Itasca, MN: 3-D map of the source of the Mississippi River.

Elmore, MN: 3-D topographical map of Elmore, MN in south-central Minnesota.

Glencoe, MN: 3-D topographical map of Glencoe, MN.

New Prague, MN: 3-D topographical map of the New Prague in south-central Minnesota.

Plainview, MN: 3-D topographical map of Plainview, MN.

Waterville-Morristown: 3-D map of the Waterville-Morris area in south-central Minnesota.

Eau Claire, WI: 3-D map of Eau Claire highlighting abandon river channels.

Dubuque, IA: 3-D topographical map of Dubuque and the Mississippi River.

Londonderry, NH: 3-D topographical map of Londonderry, NH.

Santa Cruz, CA: 3-D topographical map of Santa Cruz, California.

Crater Lake, OR: 3-D topographical map of Crater Lake, Oregon.

Mt. Rainier, WA: 3-D topographical map of Mt. Rainier in Washington.

Grand Canyon, AZ: 3-D topographical map of the Grand Canyon.

District of Columbia: 3-D map highlighting the confluence of the rivers and the Mall.

Ireland: 3-D grayscale map of Ireland.

New Jersey: 3-D grayscale map of New Jersey.

SP Crater, AZ: 3-D map of random craters in the San Francisco Mountains.

Mars Water Features: 3-D grayscale map showing surface water features from Mars.

The Sierra Lakes Inventory Project (SLIP) was a research endeavor that ran from 1995-2002 and has supported research and management of Sierra Nevada aquatic ecosystems and their terrestrial interfaces. We described the physical characteristics of and surveyed aquatic communities for > 8,000 lentic water bodies in the southern Sierra Nevada, including lakes, ponds, marshes, and meadows. We also created digital map layers for these water bodies when such layers did not exist. The original objective of SLIP was to describe impacts of non-native fish on lake communities, but SLIP data has subsequently enabled study of additional ecological issues, including regional amphibian declines and their impacts on communities, and impacts of non-native fish on terrestrial species. In addition, these data are being used to develop fish removal efforts to restore aquatic ecosystems and recover endangered amphibians. The SLIP data is stored in a relational database that collectively describes water bodies (e.g., depth, elevation, location), surveys (conditions, effort), and communities (including approximately 170 fish, amphibian, reptile, benthic macroinvertebrate, and zooplankton taxa).

NGDC's U.S. Coastal Relief Model (CRM) provides a comprehensive view of the U.S. coastal zone integrating offshore bathymetry with land topography into a seamless representation of the coast. The CRM spans the U.S. East and West Coasts, the northern coast of the Gulf of Mexico, Puerto Rico, and Hawaii, reaching out to, and in places even beyond, the continental slope. Bathymetric and topographic data sources include: NGDC's NOS hydrographic surveys and multibeam bathymetry; the U.S. Geological Survey (USGS); and other federal government agencies and academic institutions. Bathymetric contours from the International Bathymetric Chart of the Caribbean Sea and the Gulf of Mexico project were also used. Digital elevation models (DEMs) of the Great Lakes, Southern Alaska, and high-resolution DEMs of U.S. coastal communities and territories are also available.

This digital data set is a compilation of reference points representing surface-water features, ground-water levels, and topographic settings in California that were used for the regional ground-water potential map by Bedinger and Harrill (2004). The regional ground-water potential map was developed to assess potential interbasin flow in the Death Valley regional ground-water flow system (DVRFS), a 100,000-square-kilometer region of southern Nevada and California. To obtain an adequate network of control points, Bedinger and Harrill (2004) also used regional potential altitudes derived from springs and deep well data. A set of general guidelines was developed to relate regional ground-water potential to these more readily observed surface and near-surface ground-water levels and to hydrologic characteristics of ground-water basins in the DVRFS (see "Larger Work Citation", Appendix 1).

description: "West Mojave Route Network Project Travel Management Area 3 - Map 9 of 21 (Shows Route Designations Decisions for Alternatives 1, 2, 3 and 4,Planning Area Boundary, Travel Management Area Boundary, Subregion Boundaries, Field Office Boundaries, Surface Management Agencies, Land Ownership, Route Designations, Areas of Critical Environmental Concern, Sensitive Resource Receptors, Restricted Areas, Wilderness Study Areas, Off-highway Vehicle Open Areas, National Monument Boundaries, Special Recreation Management Areas, Desert Linkage Network, Soil Erosion, Air Quality Management Districts, California Air Basins, and Unusual Plant Assemblages) n n n n1. Travel Management Area 3 - Map 9 of 22 n2. WEMO Map Index Figure (Locator Map) n3. Map and Resource Data n n a. Labels ni. Route Designation n Motorized n Non-BLM n Non-Mechanized n Non-Motorized n Transportation Linear Disturbance n Route with Subdesignation n WEMO Planning Area n WEMO Travel Management Area n WEMO Subregion n BLM Field Office Boundary nii. Land Ownership n Bureau of Land Management n Forest Service n National Park Service n Fish and Wildlife Service n Bureau of Reclamation n Bureau of Indian Affairs n Department of Defense n Other Federal n State n Local Government n Private n iii. Resource Data n Area within 1/4 mile of a sensitive receptor n Area within 1 mile of a sensitive receptor n Residential Area n Wilderness Area n Area of Critical Environmental Concern n National Monument n Special Recreation Management Area n Desert Linkage Network n Area Prone to Erosion Due to Slopes Greater than 10 Percent niv. Air Quality Management Districts n Mojave Desert n South Coast n v. California Air Basins n Mojave Desert n vi. Unusual Plant Assemblage n None n n b. Base Data n i. City or Town (Data Source: USGS Geographic Names Inventory System) nii. Major Roads (Data Source: US Census TIGER/Line) n iii. County Boundary (Data Source: ESRI) niv. BLM Field Office Boundary (Data Source: BLM State Office) n n c. WEMO Planning Boundaries n i. WEMO Planning Area (Data Source: BLM State Office) n ii. Travel Management Area 3 (Data Source: BLM Barstow Field Office) n iii. Subregions - (Data Source: BLM Barstow Field Office) n n d. Project Alternatives n i. Alternative 1 - No Action (Data Source: BLM Barstow Field Office) n ii. Alternative 2 Conservation (Data Source: BLM Barstow Field Office) n iii. Alternative 3 Increased Access (Data Source: BLM Barstow Field Office) n iv. Alternative 4 - Preferred (Data Source: BLM Barstow Field Office) n n e. Non-BLM Routes or routes not under BLM jurisdiction (Data Source: BLM State Office) n n f. Resource Descriptions and Data Sources n n i. Residential Area are areas near residences (Data Source: BLM State Office) n ii. Wilderness Areas are areas that include federally designated wildernesses (Data Source: BLM State Office) n iii. Area of Critical Environmental Concern are federally protected areas with special natural resources (Data Source: BLM State Office) n iv. National Monuments are federally designated through Presidential Proclamation (Data Source: BLM State Office) n v. National Conservation Lands are lands that the Bureau of Land Management for conservation purposes federally designates these (Data Source: BLM State Office) n vi. Areas Prone to Erosion are areas that are likely to experience erosion (Data Source: BLM State Office) n vii. Air Quality Management Districts are federally designated air quality districts with boundaries (Data Source: CA Air Resource Board) n viii. California Air Basins are designated by California with boundaries (Data Source: CA Air Resource Board) n"; abstract: "West Mojave Route Network Project Travel Management Area 3 - Map 9 of 21 (Shows Route Designations Decisions for Alternatives 1, 2, 3 and 4,Planning Area Boundary, Travel Management Area Boundary, Subregion Boundaries, Field Office Boundaries, Surface Management Agencies, Land Ownership, Route Designations, Areas of Critical Environmental Concern, Sensitive Resource Receptors, Restricted Areas, Wilderness Study Areas, Off-highway Vehicle Open Areas, National Monument Boundaries, Special Recreation Management Areas, Desert Linkage Network, Soil Erosion, Air Quality Management Districts, California Air Basins, and Unusual Plant Assemblages) n n n n1. Travel Management Area 3 - Map 9 of 22 n2. WEMO Map Index Figure (Locator Map) n3. Map and Resource Data n n a. Labels ni. Route Designation n Motorized n Non-BLM n Non-Mechanized n Non-Motorized n Transportation Linear Disturbance n Route with Subdesignation n WEMO Planning Area n WEMO Travel Management Area n WEMO Subregion n BLM Field Office Boundary nii. Land Ownership n Bureau of Land Management n Forest Service n National Park Service n Fish and Wildlife Service n Bureau of Reclamation n Bureau of Indian Affairs n Department of Defense n Other Federal n State n Local Government n Private n iii. Resource Data n Area within 1/4 mile of a sensitive receptor n Area within 1 mile of a sensitive receptor n Residential Area n Wilderness Area n Area of Critical Environmental Concern n National Monument n Special Recreation Management Area n Desert Linkage Network n Area Prone to Erosion Due to Slopes Greater than 10 Percent niv. Air Quality Management Districts n Mojave Desert n South Coast n v. California Air Basins n Mojave Desert n vi. Unusual Plant Assemblage n None n n b. Base Data n i. City or Town (Data Source: USGS Geographic Names Inventory System) nii. Major Roads (Data Source: US Census TIGER/Line) n iii. County Boundary (Data Source: ESRI) niv. BLM Field Office Boundary (Data Source: BLM State Office) n n c. WEMO Planning Boundaries n i. WEMO Planning Area (Data Source: BLM State Office) n ii. Travel Management Area 3 (Data Source: BLM Barstow Field Office) n iii. Subregions - (Data Source: BLM Barstow Field Office) n n d. Project Alternatives n i. Alternative 1 - No Action (Data Source: BLM Barstow Field Office) n ii. Alternative 2 Conservation (Data Source: BLM Barstow Field Office) n iii. Alternative 3 Increased Access (Data Source: BLM Barstow Field Office) n iv. Alternative 4 - Preferred (Data Source: BLM Barstow Field Office) n n e. Non-BLM Routes or routes not under BLM jurisdiction (Data Source: BLM State Office) n n f. Resource Descriptions and Data Sources n n i. Residential Area are areas near residences (Data Source: BLM State Office) n ii. Wilderness Areas are areas that include federally designated wildernesses (Data Source: BLM State Office) n iii. Area of Critical Environmental Concern are federally protected areas with special natural resources (Data Source: BLM State Office) n iv. National Monuments are federally designated through Presidential Proclamation (Data Source: BLM State Office) n v. National Conservation Lands are lands that the Bureau of Land Management for conservation purposes federally designates these (Data Source: BLM State Office) n vi. Areas Prone to Erosion are areas that are likely to experience erosion (Data Source: BLM State Office) n vii. Air Quality Management Districts are federally designated air quality districts with boundaries (Data Source: CA Air Resource Board) n viii. California Air Basins are designated by California with boundaries (Data Source: CA Air Resource Board) n"

Field Descriptions:Name - Trail network CountyAlpineCarson CityDouglasEl DoradoPlacerWashoeDesignated UserATV - ALL TERRAIN VEHICLEBIKE - BICYCLEHIKE - HIKER/PEDESTRIANPACK - PACK AND SADDLETrail Class (see Trail Class Matrix for more info)TC1 - Minimally Developed - Tread intermittent, may require route finding, obstacles common, narrow passages, steep gradesTC2 - Moderately Developed - Tread continous and discernible, but narrow and roughTC3 - Developed - Tread continous and obvious, single lane, obstacles common but not substantial, vegetation cleared outside of trailwayTC4 - Highly Developed- Tread wide and relatively smooth, single lane with allowances for passing, obstacles infrequent, vegeation cleared to side of trailwayTC5 - Fully Developed - Tread wide, firm, stable, and generally uniform, obstacles not present, grades typically <8%Trail StatusOfficialUnofficialTrail SystemOwnerForest ServiceLocalPrivateStateState LandsState ParksTahoe Rim TrailMotorized (Y/N)Equestrian (Y/N)NotesThis layer was created based on data provided by the Forest Service on 3/27/2019. This layer includes Forest Service trails as well as trails verified in other resources. The following resources were used to create this layer:Gaia GPS: https://www.gaiagps.com/map/?loc=11.0/-119.9865/38.9169&layer=GaiaTopoRasterFeetAll Trails: https://www.alltrails.com/explore/us/california/south-lake-tahoeGoogle Maps

Between September 2008 and September 2009, data were collected along the Kern Canyon fault starting south-east of Bakersfield and extending north to the southern end of Kings Canyon National Park. This dataset has helped identify late Quaternary deformation, and other seismogenic processes that are occurring within this section of the Sierra Nevadas. In addition, lidar derived topographic data was used for interpretation, analysis and mapping of floodplains along Isabella Lake, as well as the Kern River and its tributaries.

For additional information about this dataset and related geologic investigations, see:
C.C. Brossy, K.I. Kelson, C.B. Amos, J.N. Baldwin, B. Kozlowicz, D. Simpson, M.G. Ticci, A.T. Lutz, O. Kozaci, A. Streig, R. Turner, R. Rose; Map of the late Quaternary active Kern Canyon and Breckenridge faults, southern Sierra Nevada, California. Geosphere ; 8 (3): 581:591. doi: https://doi.org/10.1130/GES00663.1

The California Native Plant Society (CNPS) Vegetation Program produced a vegetation map and classification for approximately 35,000 acres including the town of Raymond and extending to Eastman Lake to the west, and surrounding Hensley Lake to the south (Madera and Mariposa Counties, California). CNPS delineated vegetation polygons using 2012 NAIP aerial imagery and CNPS survey data collected between 2008 to 2010, as well as field reconnaissance in 2014. The mapped area includes mostly private lands, as well as the properties adjacent to Eastman and Hensley Lakes which are managed by the Army Corps of Engineers. The vegetation classification of 47 native vegetation alliances and semi-natural stands was based on data within the southern Sierra Nevada Foothills Ecoregion across a larger area of approximately 300,000 acres including portions of Mariposa, Madera, and Fresno Counties. The vegetation map resulted in 31 types of mapping units including alliance-level vegetation types from the floristic classification within the focused study area.

This data set maps and describes the geology of the Fifteenmile Valley 7.5' quadrangle, San Bernardino County, California. Created using Environmental Systems Research Institute's ARC/INFO software, the data base consists of the following items: (1) a map coverage containing geologic contacts and units, (2) attribute tables for geologic units (polygons), contacts (arcs), and site-specific data (points). In addition, the data set includes the following graphic and text products: (1) A PostScript graphic plot-file containing the geologic map, topography, cultural data, a Correlation of Map Units (CMU) diagram, a Description of Map Units (DMU), an index map, a regional geologic and structure map, and a key for point and line symbols; (2) PDF files of this Readme (including the metadata file as an appendix), Description of Map Units (DMU), and a screen graphic of the plot produced by the PostScript plot file. The geologic map covers the northernmost part of the San Bernardino Mountains and the southern Granite Mountains. These two bedrock areas are separated by the wide, alluviated Fifteenmile Valley. Bedrock units in the San Bernardino Mountains are dominated by large Cretaceous granitic bodies ranging in composition from monzogranite to gabbro, and include lesser Triassic monzonite. The Granite Mountains are underlain chiefly by large Triassic monzonite bodies, and in the western part, by Cretaceous and possibly Jurassic monzogranite to monzodiorite. Spanning the Pleistocene in age, large alluvial fans, flank the north side of the San Bernardino Mountains, and are dominated by debris flow deposits. The central part of Fifteenmile Valley is covered by fine grained alluvial material deposited by streams flowing into Rabbit Lake and an unnamed dry lake in the northwestern part of the quadrangle. Young, south dipping reverse faults, some with moderately to well eroded fault scarps, discontinuously flank the northern edge of the San Bernardino Mountains. Young and old high-angle faults are mapped within both the San Bernardino and Granite Mountains. The geologic map database contains original U.S. Geological Survey data generated by detailed field observation and by interpretation of aerial photographs. The map was compiled on a base-stable cronoflex copy of the Fifteenmile Valley 7.5' topographic base and then scribed. This scribe guide was used to make a 0.007 mil blackline clear-film, which was scanned at 1200 DPI by Optronics Specialty Company, Northridge, California; minor hand-digitized additions were made at the USGS. Lines, points, and polygons were subsequently edited at the USGS using standard ARC/INFO commands. Digitizing and editing artifacts significant enough to display at a scale of 1:24,000 were corrected. Within the database, geologic contacts are represented as lines (arcs), geologic units as polygons, and site-specific data as points. Polygon, arc, and point attribute tables (.pat, .aat, and .pat, respectively) uniquely identify each geologic datum.

The data set for the Fifteenmile Valley 7.5' quadrangle was prepared under the U.S. Geological Survey Southern California Areal Mapping Project (SCAMP) as part of an ongoing effort to develop a regional geologic framework of southern California, and to utilize a Geographical Information System (GIS) format to create regional digital geologic databases. These regional databases are being developed as contributions to the National Geologic Map Database of the National Cooperative Geologic Mapping Program of the USGS.

The digital geologic map database for the Fifteenmile Valley 7.5' quadrangle has been created as a general-purpose data set that is applicable to other land-related investigations in the earth and biological sciences. For example, it can be used for mineral resource evaluation studies, animal and plant habitat studies, and soil studies in the San Bernardino National Forest. The database is not suitable for site-specific geologic evaluations.

This data set maps and describes the geology of the Fifteenmile Valley 7.5' quadrangle, San Bernardino County, California. Created using Environmental Systems Research Institute's ARC/INFO software, the data base consists of the following items: (1) a map coverage containing geologic contacts and units, (2) attribute tables for geologic units (polygons), contacts (arcs), and site-specific data (points). In addition, the data set includes the following graphic and text products: (1) A PostScript graphic plot-file containing the geologic map, topography, cultural data, a Correlation of Map Units (CMU) diagram, a Descriptionof Map Units (DMU), an index map, a regional geologic and structure map, and a key for point and line symbols; (2) PDF files of this Readme (including the metadata file as an appendix), Description of Map Units (DMU), and a screen graphic of the plot produced by the PostScript plot file.

The geologic map covers the northernmost part of the San Bernardino Mountain and the southern Granite Mountains. These two bedrock areas are separated by the wide, alluviated Fifteenmile Valley. Bedrock units in the San Bernardino Mountains are dominated by large Cretaceous granitic bodies ranging in composition from monzogranite to gabbro, and include lesser Triassic monzonite. The Granite Mountains are underlain chiefly by large Triassic monzonite bodies, and in the western part, by Cretaceous and possibly Jurassic monzogranite to monzodiorite. Spanning the Pleistocene in age, large alluvial fans, flank the north side of the San Bernardino Mountains, and are dominated by debris flow deposits. The central part of Fifteenmile Valley is covered by fine grained alluvial material deposited by streams flowing into Rabbit Lake and an unnamed dry lake in the northwestern part of the quadrangle. Young, south dipping reverse faults, some with moderately to well eroded fault scarps, discontinuously flank the northern edge of the San Bernardino Mountains. Young and old high-angle faults are mapped within both the San Bernardino and Granite Mountains.

The geologic map database contains original U.S. Geological Survey data generated by detailed field observation and by interpretation of aerial photographs. The map was compiled on a base-stable cronoflex copy of the Fifteenmile Valley 7.5' topographic base and then scribed. This scribe guide was used to make a0.007 mil blackline clear-film, which was scanned at 1200 DPI by Optronics Specialty Company, Northridge, California; minor hand-digitized additions were madeat the USGS. Lines, points, and polygons were subsequently edited at the USGS using standard ARC/INFO commands. Digitizing and editing artifacts significan enough to display at a scale of 1:24,000 were corrected. Within the database, geologic contacts are represented as lines (arcs), geologic units as polygons, and site-specific data as points. Polygon, arc, and point attribute tables (.pat, .aat, and .pat, respectively) uniquely identify each geologic datum.

This dataset combines the work of several different projects to create a seamless data set for the contiguous United States. Data from four regional Gap Analysis Projects and the LANDFIRE project were combined to make this dataset. In the northwestern United States (Idaho, Oregon, Montana, Washington and Wyoming) data in this map came from the Northwest Gap Analysis Project. In the southwestern United States (Colorado, Arizona, Nevada, New Mexico, and Utah) data used in this map came from the Southwest Gap Analysis Project. The data for Alabama, Florida, Georgia, Kentucky, North Carolina, South Carolina, Mississippi, Tennessee, and Virginia came from the Southeast Gap Analysis Project and the California data was generated by the updated California Gap land cover project. The Hawaii Gap Analysis project provided the data for Hawaii. In areas of the county (central U.S., Northeast, Alaska) that have not yet been covered by a regional Gap Analysis Project, data from the Landfire project was used. Similarities in the methods used by these projects made possible the combining of the data they derived into one seamless coverage. They all used multi-season satellite imagery (Landsat ETM+) from 1999-2001 in conjunction with digital elevation model (DEM) derived datasets (e.g. elevation, landform) to model natural and semi-natural vegetation. Vegetation classes were drawn from NatureServe's Ecological System Classification (Comer et al. 2003) or classes developed by the Hawaii Gap project. Additionally, all of the projects included land use classes that were employed to describe areas where natural vegetation has been altered. In many areas of the country these classes were derived from the National Land Cover Dataset (NLCD). For the majority of classes and, in most areas of the country, a decision tree classifier was used to discriminate ecological system types. In some areas of the country, more manual techniques were used to discriminate small patch systems and systems not distinguishable through topography. The data contains multiple levels of thematic detail. At the most detailed level natural vegetation is represented by NatureServe's Ecological System classification (or in Hawaii the Hawaii GAP classification). These most detailed classifications have been crosswalked to the five highest levels of the National Vegetation Classification (NVC), Class, Subclass, Formation, Division and Macrogroup. This crosswalk allows users to display and analyze the data at different levels of thematic resolution. Developed areas, or areas dominated by introduced species, timber harvest, or water are represented by other classes, collectively refered to as land use classes; these land use classes occur at each of the thematic levels. Raster data in both ArcGIS Grid and ERDAS Imagine format is available for download at http://gis1.usgs.gov/csas/gap/viewer/land_cover/Map.aspx Six layer files are included in the download packages to assist the user in displaying the data at each of the Thematic levels in ArcGIS. In adition to the raster datasets the data is available in Web Mapping Services (WMS) format for each of the six NVC classification levels (Class, Subclass, Formation, Division, Macrogroup, Ecological System) at the following links. http://gis1.usgs.gov/arcgis/rest/services/gap/GAP_Land_Cover_NVC_Class_Landuse/MapServer http://gis1.usgs.gov/arcgis/rest/services/gap/GAP_Land_Cover_NVC_Subclass_Landuse/MapServer http://gis1.usgs.gov/arcgis/rest/services/gap/GAP_Land_Cover_NVC_Formation_Landuse/MapServer http://gis1.usgs.gov/arcgis/rest/services/gap/GAP_Land_Cover_NVC_Division_Landuse/MapServer http://gis1.usgs.gov/arcgis/rest/services/gap/GAP_Land_Cover_NVC_Macrogroup_Landuse/MapServer http://gis1.usgs.gov/arcgis/rest/services/gap/GAP_Land_Cover_Ecological_Systems_Landuse/MapServer

The USGS compiles online access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, Puerto Rico, the Virgin Islands, Guam, American Samoa and the Commonwealth of the Northern Mariana Islands.

CDFW BIOS GIS Dataset, Contact: U.S. Fish & Wildlife Service USFWS, Description: These data identify the areas (in general) where U.S. Fish & Wildlife Service has designated final critical habitat for the Inyo California towhee. Critical habitat for the species occurs in 11 units consisting of isolated canyons and individual springs in the Argus Range, southern Inyo County, California. A large portion of final critical habitat lies on the China Lake Naval Air Weapons Station, the remainder on BLM land immeditely east of the China Lake installation.