Geology and geomorphology--Offshore of Bolinas Map Area, California
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Metadata:
- Identification_Information:
-
- Citation:
-
- Citation_Information:
-
- Originator: S.Y. Johnson
- Originator: H.G. Greene
- Originator: M.W. Manson
- Originator: S.R. Hartwell
- Originator: C.A. Endris
- Originator: J.T. Watt
- Publication_Date: 2014
- Title:
-
Geology and geomorphology--Offshore of Bolinas Map Area, California
- Geospatial_Data_Presentation_Form: vector digital data
- Larger_Work_Citation:
-
- Citation_Information:
-
- Originator: Guy R. Cochrane
- Originator: Peter Dartnell
- Originator: Samuel Y. Johnson
- Originator: H. Gary Greene
- Originator: Mercedes D. Erdey
- Originator: Nadine E. Golden
- Originator: Stephen R. Hartwell
- Originator: Michael W. Mansion
- Originator: Ray W. Sliter
- Originator: Charles A. Endris
- Originator: Janet T. Watt
- Originator: Stephanie L. Ross
- Originator: Rikk G. Kvitek
- Originator: Eleyne L. Phillips
- Originator: Terry R. Bruns
- Originator: John L. Chin
- Publication_Date: 2015
- Title:
-
California State Waters Map Series--Offshore of Bolinas Map Area, California
- Geospatial_Data_Presentation_Form: map
- Series_Information:
-
- Series_Name: Open-File Report
- Issue_Identification: OFR 2015-1135
- Publication_Information:
-
- Publication_Place: Reston, VA
- Publisher: U.S. Geological Survey
- Online_Linkage: <https://dx.doi.org/10.3133/ofr20151135>
- Online_Linkage: <https://pubs.usgs.gov/of/2015/1135/>
- Larger_Work_Citation:
-
- Citation_Information:
-
- Originator: Nadine E. Golden
- Publication_Date: 2013
- Title: California State Waters Map Series Data Catalog
- Geospatial_Data_Presentation_Form: database
- Series_Information:
-
- Series_Name: Data Series
- Issue_Identification: DS 781
- Publication_Information:
-
- Publication_Place: Reston, VA
- Publisher: U.S. Geological Survey
- Online_Linkage: <https://pubs.usgs.gov/ds/781/>
- Online_Linkage:
-
https://www.sciencebase.gov/arcgis/rest/services/Catalog/5556cd65e4b0a92fa7e9cfbd/MapServer
- Online_Linkage:
-
https://www.sciencebase.gov/arcgis/services/Catalog/5556cd65e4b0a92fa7e9cfbd/MapServer/WMSServer?request=GetCapabilities&service=WMS
- Description:
-
- Abstract:
-
This part of DS 781 presents data for the geologic and geomorphic map of the Offshore of Bolinas map area, California. The vector data file is included in "Geology_OffshoreBolinas.zip," which is accessible from <https://pubs.usgs.gov/ds/781/OffshoreBolinas/data_catalog_OffshoreBolinas.html>.
The continental shelf within California's State waters in the Bolinas area is relatively flat (less than 0.3 degrees) and shallow (less than 30 m) in the entire area, however the seafloor of the "Marin shelf" east of the San Andreas Fault (see below) is smooth and covered with sediment, whereas the seafloor of the "Bolinas shelf" west of this fault has extensive bedrock outcrop from the nearshore to depths of about 25 m and much less sediment cover. The morphology and geology of this shelf result from the interplay between local tectonics, sea-level rise, sedimentary processes, and oceanography. Tectonic influences are related to local faulting, folding, uplift, and subsidence (see below). Sea level has risen about 125 to 130 m over about the last 21,000 years (for example, Lambeck and Chappel, 2001; Gornitz, 2009), leading to progressive eastward migration (a few tens of km) of the shoreline and wave-cut platform, and associated transgressive erosion and deposition (for example, Catuneanu, 2006). The Offshore of Bolinas map area is now subjected to full, and sometimes severe, Pacific Ocean wave energy and strong currents.
Given their relatively shallow depths and exposure to high wave energy, modern shelf sediments are mostly sand (unit Qms). More coarse-grained sands and gravels (units Qmsc and Qmss) are primarily recognized on the basis of bathymetry and high backscatter (see Bathymetry--Offshore Bolinas, California and Backscattter A to E--Offshore Bolinas, California, DS 781, for more information). Unit Qmsc occurs in two areas, on the east flank of Bolinas shelf bedrock exposures, and as three mounds south of Bolinas near the outer boundary of California’s State Waters at water depths of about 25 m. The largest of these mounds is about 450 m long and 70 m wide, and has 80 cm of positive relief above the seafloor.
Unit Qmss is much more extensive and forms erosional lags in rippled scour depressions (for example, Cacchione and others, 1984) that are typically a few tens of centimeters deep and bounded by mobile sand sheets. The depressions occur in four distinct locations. (1) The first location lies adjacent to bedrock outcrops within 2 km of the shoreline south of Double Point (along the western edge of the map area) at water depths of 10 to 25 m. (2) The second unit Qmss location is about 2 to 6 km south of Bolinas Lagoon at similar water depths, along the eastern flank of the Bolinas shelf. (3) The third, more restricted location, occurs about 3 km southeast of Rocky Point at water depths of about 10 to 12 m along the eastern edge of the map area, adjacent to and offshore of small bedrock uplifts. (4) The fourth location, 2 km south of Stinson Beach, is notably different. The polygon on the map encloses a field that includes more than one hundred, much smaller (length less than 20 m) oval depressions and intervening sand flats, perhaps an originally much larger field that has been almost completely filled in by sediment.
Similar unit Qmss rippled-scour depressions are common along this stretch of the California coast where offshore sandy sediment can be relatively thin (thus unable to fill the depressions) due to both lack of river input and to significant erosion and transport of sediment during large northwest winter swells. Although the general areas in which both unit Qmss scour depressions and surrounding mobile sand sheets occur are not likely to change substantially, the boundaries of the unit(s) are likely ephemeral, changing seasonally and during significant storm events.
Areas where shelf sediments form thin (less than 2.5 m) veneers over low-relief Neogene bedrock (see below) occur in the western half of the map and are mapped as units Qms/Tsc (Santa Cruz Mudstone) and Qms/Tp? (Purisima Formation, queried). These hybrid units are recognized and delineated based on the combination of flat relief, continuity with moderate to high relief onshore or offshore bedrock outcrops, high-resolution seismic-reflection data (see field activities S-8-09-NC and L-1-06-SF), and in some cases moderate to high backscatter. The thin sediment layer is regarded as ephemeral and dynamic, and may or may not be present at a specific location based on storms, seasonal/annual patterns of sediment movement, or longer-term climate cycles. In a nearby, similarly high-energy setting, Storlazzi and others (2011) have described seasonal burial and exhumation of submerged bedrock in northern Monterey Bay.
The southeastern corner of the map area includes a portion of the outer flank of the horseshoe-shaped "San Francisco Bar" (unit Qmsb), which has formed at the mouth of the San Francisco ebb-tidal delta (Barnard and others, 2007; Dallas and Barnard, 2011). This delta-mouth bar is shaped by both tidal currents and waves, resulting in a variably hummocky, mottled, and rilled seafloor, and this surface texture is used as a primary criteria for mapping the unit and defining its contacts.
Map unit polygons were digitized over underlying 2-meter base layers developed from multibeam bathymetry and backscatter data (see Bathymetry--Offshore Bolinas, California and Backscattter A to E--Offshore Bolinas, California, DS 781, for more information). The bathymetry and backscatter data were collected between 2006 and 2010.
References Cited
Barnard, P.L., Eshelman, J., Erikson, L., and Hanes, D.M., 2007, Coastal processes study at Ocean Beach, San Francisco, CA: Summary of data collection 2004-2006: U.S. Geological Survey Open-File Report 2007-1217, 165 p.
Cacchione, D.A., Drake, D.E., Grant, W.D., and Tate, G.B., 1984. Rippled scour depressions of the inner continental shelf off central California: Journal of Sedimentary Petrology, v 54, p. 1280-1291.
Catuneanu, O., 2006, Principles of Sequence Stratigraphy: Amsterdam, Elsevier, 375 p.
Dallas, K.L., and Barnard, P.L., 2011, Anthropogenic influences on shoreline and nearshore evolution in the San Francisco coastal system: Estuarine Coastal and Shelf Science, v. 92, p. 195-204.
Gornitz, V., 2009, Sea level change, post-glacial, in Gornitz, V., ed., Encyclopedia of Paleoclimatology and Ancient Environments: Encyclopedia of Earth Sciences Series. Springer, pp. 887-893.
Lambeck, K., and Chappell, J., 2001, Sea level change through the last glacial cycle: Science, v. 292, p. 679-686.
Storlazzi, C.D., Fregoso, T.A., Golden, N.E., and Finlayson, D.P., 2011, Sediment dynamics and the burial and exhumation of bedrock reefs along on emergent coastline as elucidated by repretitive sonar surveys, northern Monterey Bay, CA: Marine Geology, v. 289, p. 46-59.
- Purpose:
-
To expand geologic mapping to the seafloor within the California's State
Waters, to update coastal geologic mapping, and to contribute to a
uniform regional geologic database, which can be used geographic information systems.
Additionally, to provide a geologic map for the public and geoscience community to aid in assessments and mitigation of geologic hazards in the Bolinas coastal region and to provide sufficient geologic information for land-use and
land-management decisions both onshore and offshore.
This information is not intended for navigational purposes.
- Supplemental_Information:
-
Map political location: Marin County, California
Compilation scale: 1:24,000
Base maps used are hillshades generated from IfSAR, LiDAR, and multibeam
mapping both onshore and offshore (see Bathymetry Hillshade--Offshore Bolinas, California, California, DS 781, for more information).
- Time_Period_of_Content:
-
- Time_Period_Information:
-
- Range_of_Dates/Times:
-
- Beginning_Date: 2006
- Ending_Date: 2009
- Currentness_Reference: ground condition
- Status:
-
- Progress: Complete
- Maintenance_and_Update_Frequency: none planned
- Spatial_Domain:
-
- Bounding_Coordinates:
-
- West_Bounding_Coordinate: -122.78
- East_Bounding_Coordinate: -122.58
- North_Bounding_Coordinate: 37.96
- South_Bounding_Coordinate: 37.81
- Keywords:
-
- Theme:
-
- Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
- Theme_Keyword: Oceans > Bathymetry/SeafloorTopography > Bathymetry
- Theme_Keyword: Oceans > Bathymetry/SeafloorTopography > Seafloor Topography
- Theme:
-
- Theme_Keyword_Thesaurus: ISO 19115 Topic Category
- Theme_Keyword: geoscientificInformation
- Theme_Keyword: environment
- Theme_Keyword: oceans
- Theme_Keyword: imageryBaseMapsEarthCover
- Place:
-
- Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
- Place_Keyword: Pacific Ocean
- Place_Keyword: State of California
- Place_Keyword: Bolinas
- Place_Keyword: Marin County
- Place_Keyword: Stinson Beach
- Place_Keyword: Bolinas Lagoon
- Access_Constraints:
-
If physical samples or materials are available, constraints on their on-site access
are described in "WR CMG Sample Distribution Policy" at URL:
<http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html>
- Use_Constraints:
-
This information is not intended for navigational purposes.
Read and fully comprehend the metadata prior to data use. Uses of these
data should not violate the spatial resolution of the data. Where
these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data.
Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.
This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
- Point_of_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: USGS Pacific Coastal and Marine Science Center
- Contact_Person: Stephen Hartwell
- Contact_Position: Geologist
- Contact_Address:
-
- Address_Type: physical address
- Address: 400 Natural Bridges Drive
- City: Santa Cruz
- State_or_Province: CA
- Postal_Code: 95060
- Country: USA
- Contact_Voice_Telephone: (831) 460-7814
- Contact_Facsimile_Telephone: (831) 427-4748
- Contact_Electronic_Mail_Address: shartwell@usgs.gov
- Native_Data_Set_Environment:
-
Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 10.0.0.2414
- Browse_Graphic:
-
- Browse_Graphic_File_Name:
-
<https://pubs.usgs.gov/ds/781/OffshoreBolinas/images/Geology_OffshoreBolinas.jpg>
- Browse_Graphic_File_Description: Geology and geomorphology offshore Bolinas.
- Browse_Graphic_File_Type: JPEG
- Data_Quality_Information:
-
- Logical_Consistency_Report:
-
Map elements were visually checked for overshoots,
undershoots, duplicate features, polygon closure, and other errors by the
lead authors and by the GIS technician(s) who created the digital database.
Review drafts of the map were reviewed internally by at least two other geologists for consistency
with basic geologic principles and general conformity to USGS mapping
standards.
- Completeness_Report:
-
Data are complete: no offshore features that could be accurately identified and
represented at the compilation scale of 1:24,000 were eliminated or
generalized. The smallest area represented is approximately 100 square
meters. All geospatial database elements are attributed.
- Positional_Accuracy:
-
- Horizontal_Positional_Accuracy:
-
- Horizontal_Positional_Accuracy_Report:
-
Polygons were primarily mapped by one
of the following methods: (1) interpretation of 2-meter-resolution hillshaded bathymetry data from sonar surveys (see Bathymetry Hillshade--Offshore Bolinas, California, California, DS 781, for more information); (2) interpretation of 2-meter-resolution amplitude (backscatter)
data from bathymetric sonar surveys (see BackscatterA_8101_2004; BackscatterB_8101_2007; BackscatterC_7125; and BackscatterD_Snippets; and Backscatter E_Swath--Offshore Bolinas, California, DS 781, for more information); (3) interpretation of 2-meter
interpretation of seismic-reflection-profile data (see field activities S-8-09-NC and L-1-06-SF).
Map Unit contact locations were interpreted typically at a scale of between 1:1,000 and 1:2,000 using the above base data. Bathymetric sonar data have a
horizontal accuracy greater than the resolution of the base data.
Map unit contacts were digitized by heads-up screen digitization of line data on 2-meter-resolution DEMs described above. Horizontal accuracy is estimated to be between 2 and 5 meters depending on how clearly contacts can be resolved.
Most digitized positions on the map are estimated to have better than 5 m horizontal accuracy.
There is no elevation data in the database.
- Lineage:
-
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator: Peter Dartnell
- Originator: Rikk G. Kvitek
- Originator: Carrie K. Bretz
- Publication_Date: 2013
- Title: Bathymetry--Offshore of Bolinas Map Area, California
- Geospatial_Data_Presentation_Form: raster digital data
- Series_Information:
-
- Series_Name: Data Series
- Issue_Identification: DS 781
- Publication_Information:
-
- Publication_Place: Reston, VA
- Publisher: U.S. Geological Survey
- Other_Citation_Details:
-
See metadata for bathymetry ("Bathymetry_OffshoreBolinas_metadata.txt") in DS 781 for source data and postprocessing/reprocessing information.
- Online_Linkage:
-
<https://pubs.usgs.gov/ds/781/OffshoreBolinas/metadata/Bathymetry_OffshoreBolinas_metadata.txt>
- Type_of_Source_Media: digital file of gridded bathymetry data (ArcInfo GRID)
- Source_Time_Period_of_Content:
-
- Time_Period_Information:
-
- Range_of_Dates/Times:
-
- Beginning_Date: 2006
- Ending_Date: 2009
- Source_Currentness_Reference: ground condition
- Source_Citation_Abbreviation: DS 781
- Source_Contribution: Gridded bathymetry data (2-meter resolution).
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator: Peter Dartnell
- Originator: Mercedes Erdey
- Originator: Rikk G. Kvitek
- Originator: Carrie K. Bretz
- Publication_Date: 2013
- Title: Bathymetry--Offshore of Bolinas Map Area, California
- Geospatial_Data_Presentation_Form: raster digital data
- Series_Information:
-
- Series_Name: Data Series
- Issue_Identification: DS 781
- Publication_Information:
-
- Publication_Place: Reston, VA
- Publisher: U.S. Geological Survey
- Other_Citation_Details:
-
See metadata for backscatter data ("BackscatterA_8101_2004_OffshoreBolinas_metadata.txt", "BackscatterB_8101_2007_OffshoreBolinas_metadata.txt", "BackscatterC_7125_OffshoreBolinas_metadata.txt", "BackscatterD_Snippets_OffshoreBolinas_metadata.txt", and "BackscatterE_Swath_OffshoreBolinas_metadata.txt") in DS 781 for amplitude source data and postprocessing/reprocessing information.
- Online_Linkage:
-
<https://pubs.usgs.gov/ds/781/OffshoreBolinas/metadata/BackscatterA_8101_2004_OffshoreBolinas_metadata.txt>
- Online_Linkage:
-
<https://pubs.usgs.gov/ds/781/OffshoreBolinas/metadata/BackscatterB_8101_2007_OffshoreBolinas_metadata.txt>
- Online_Linkage:
-
<https://pubs.usgs.gov/ds/781/OffshoreBolinas/metadata/BackscatterC_7125_OffshoreBolinas_metadata.txt>
- Online_Linkage:
-
<https://pubs.usgs.gov/ds/781/OffshoreBolinas/metadata/BackscatterD_Snippets_OffshoreBolinas_metadata.txt>
- Online_Linkage:
-
<https://pubs.usgs.gov/ds/781/OffshoreBolinas/metadata/BackscatterE_Swath_OffshoreBolinas_metadata.txt>
- Type_of_Source_Media: digital file of gridded amplitude data (ArcInfo GRID)
- Source_Time_Period_of_Content:
-
- Time_Period_Information:
-
- Range_of_Dates/Times:
-
- Beginning_Date: 2006
- Ending_Date: 2007
- Source_Currentness_Reference: ground condition
- Source_Citation_Abbreviation: DS 781
- Source_Contribution: Gridded amplitude data (2-meter resolution).
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator:
-
U.S. Geological Survey (USGS) , Coastal and Marine Geology Program (CMGP)
- Publication_Date: 2013
- Title:
-
Chirp and High-Resolution Mini-Sparker Seismic data of field activity L-1-06-SF in Offshore Golden Gate, San Francisco County, CA from 09/25/2006 to 10/03/2006
- Publication_Information:
-
- Publication_Place: Menlo Park, CA
- Publisher:
-
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
- Online_Linkage: <http://walrus.wr.usgs.gov/infobank/gos/l-1-06-sf.fmeta.xml>
- Online_Linkage:
-
<http://walrus.wr.usgs.gov/infobank/l/l106sf/html/l-1-06-sf.meta.html>
- Type_of_Source_Media: ASCII lat/long shot point files
- Source_Time_Period_of_Content:
-
- Time_Period_Information:
-
- Range_of_Dates/Times:
-
- Beginning_Date: 20060925
- Ending_Date: 20061003
- Source_Currentness_Reference: ground condition
- Source_Citation_Abbreviation: L-1-06-SF
- Source_Contribution:
-
Digital seismic data used to interpret subsurface geologic structure
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator:
-
U.S. Geological Survey (USGS) , Coastal and Marine Geology Program (CMGP)
- Publication_Date: 2013
- Title:
-
Subbottom survey data of field activity S-8-09-NC in Stinson Beach to Point Arena (CA) from 09/08/2009 to 09/30/2009
- Publication_Information:
-
- Publication_Place: Menlo Park, CA
- Publisher:
-
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
- Online_Linkage: <http://walrus.wr.usgs.gov/infobank/gos/s-8-09-nc.fmeta.xml>
- Online_Linkage:
-
<http://walrus.wr.usgs.gov/infobank/s/s809nc/html/s-8-09-nc.meta.html>
- Type_of_Source_Media: ASCII lat/long shot point files
- Source_Time_Period_of_Content:
-
- Time_Period_Information:
-
- Range_of_Dates/Times:
-
- Beginning_Date: 20090908
- Ending_Date: 20090930
- Source_Currentness_Reference: ground condition
- Source_Citation_Abbreviation: S-8-09-NC
- Source_Contribution:
-
Digital seismic data used to interpret subsurface geologic structure
- Process_Step:
-
- Process_Description:
-
Map unit polygons were digitized over underlying 2-meter base layers developed from multibeam bathymetry and backscatter data. Derivatives such as slope and curvature were generated from source rasters. Interpreted rasters include amplitude, hillshaded bathymetry (using various illumination angles and vertical exaggeration), slope, and curvature. Curvature was decomposed into profile and plan curvature for analysis purposes.
- Process_Date: 2012
- Process_Step:
-
- Process_Description:
-
The mapped area was extended to the shoreline by using digital orthophotos to interpret the region between the inner edge of the multibeam bathymetry and the approximate shoreline. The approximate shoreline was generated at the NAVD88 +1.46 m contour, defined as the operational MHW shoreline by Weber and others (2005). The resulting boundary was transformed to WGS 84 UTM Zone 10 North in ArcGIS 10 using the NAD83 to WGS84 (ITRF00) transformation algorithm. This boundary was then used to extend and trim both onshore and offshore geology in the print and PDF product. The transformed boundary is contained within the WGS84 "contours" feature class and identified as a water boundary in the associated representation rules.
Only data for offshore map units are released digitally in this publication. For onshore geology (see California Geological Survey (1974), Clark and Brabb (1997), Blake and others (2000), and Witter and others (2006).
References Cited:
Blake, M.C., Jr., Graymer, R.W., and Jones, D.L., 2000, Geologic map and map database of parts of Marin, San Francisco, Alameda, Contra Costa, and Sonoma counties, California: U.S. Geological Survey Miscellaneous Field Studies Map 2337, scale 1:62,500.
California Geological Survey, 1974, Alquist-Priolo Earthquake Fault Zone Map of Bolinas quadrangle, scale 1:24,000.
Clark, J.C., and Brabb, E.E., 1997, Geology of the Point Reyes National Seashore and vicinity: U.S. Geological Survey Open-File Report 97-456, scale 1:48,000.
Weber, K.M., List, J.H., and Morgan, K.L., 2005, An operational Mean High Water datum for determination of shoreline position from topographic lidar data: U.S. Geological Survey Open-File Report 2005-1027, available at <https://pubs.usgs.gov/of/2005/1027/>.
Witter, R.C., Knudsen, K.L., Sowers, J.M., Wentworth, C.M., Koehler, R.D., Randolph, C.E., Brooks, S.K., and Gans, K.D., 2006, Maps of Quaternary Deposits and Liquefaction Susceptibility in the Central San Francisco Bay Region, California, U.S. Geological Survey Open-File Report 06-1037, scale 1:24,000.
- Process_Date: 2011
- Process_Step:
-
- Process_Description:
-
Faults were mapped onto shot lines based on the latitude and longitude of seismic picks from field activity
S-8-09-NC.
- Process_Date: 2011
- Process_Step:
-
- Process_Description:
-
Faults were mapped onto shot lines based on the latitude and longitude of seismic picks from field activity
L-1-06-SF.
- Process_Date: 2011
- Spatial_Data_Organization_Information:
-
- Direct_Spatial_Reference_Method: Vector
- Point_and_Vector_Object_Information:
-
- SDTS_Terms_Description:
-
- SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
- Point_and_Vector_Object_Count: 874
- Spatial_Reference_Information:
-
- Horizontal_Coordinate_System_Definition:
-
- Planar:
-
- Map_Projection:
-
- Map_Projection_Name: WGS 1984 UTM Zone 10N
- Transverse_Mercator:
-
- Scale_Factor_at_Central_Meridian: 0.9996
- Longitude_of_Central_Meridian: -123.0
- Latitude_of_Projection_Origin: 0.0
- False_Easting: 500000.0
- False_Northing: 0.0
- Planar_Coordinate_Information:
-
- Planar_Coordinate_Encoding_Method: coordinate pair
- Coordinate_Representation:
-
- Abscissa_Resolution: 0.0001
- Ordinate_Resolution: 0.0001
- Planar_Distance_Units: Meter
- Geodetic_Model:
-
- Horizontal_Datum_Name: D WGS 1984
- Ellipsoid_Name: WGS 1984
- Semi-major_Axis: 6378137.0
- Denominator_of_Flattening_Ratio: 298.257223563
- Entity_and_Attribute_Information:
-
- Detailed_Description:
-
- Entity_Type:
-
- Entity_Type_Label: Geology_OffshoreBolinas
- Entity_Type_Definition: Polygons representing geologic / geomorphic map units
- Entity_Type_Definition_Source: This report
- Attribute:
-
- Attribute_Label: FID
- Attribute_Definition: Internal feature number.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain:
-
Sequential unique whole numbers that are automatically generated.
- Attribute:
-
- Attribute_Label: Shape
- Attribute_Definition: Feature geometry.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
-
- Attribute_Label: MapUnitAbbrev
- Attribute_Definition: Map Unit abbreviation
- Attribute_Definition_Source: This report
- Attribute_Domain_Values:
-
- Enumerated_Domain:
-
- Enumerated_Domain_Value: Qms
- Enumerated_Domain_Value_Definition: Marine nearshore and shelf deposits
- Enumerated_Domain_Value_Definition_Source: This report
- Attribute_Domain_Values:
-
- Enumerated_Domain:
-
- Enumerated_Domain_Value: Qmss
- Enumerated_Domain_Value_Definition: Marine shelf scour depressions
- Enumerated_Domain_Value_Definition_Source: This report
- Attribute_Domain_Values:
-
- Enumerated_Domain:
-
- Enumerated_Domain_Value: Qmsc
- Enumerated_Domain_Value_Definition: Coarse-grained marine nearshore and shelf deposits
- Enumerated_Domain_Value_Definition_Source: This report
- Attribute_Domain_Values:
-
- Enumerated_Domain:
-
- Enumerated_Domain_Value: Qmsb
- Enumerated_Domain_Value_Definition: Marine ebb-tidal bar deposits
- Enumerated_Domain_Value_Definition_Source: This report
- Attribute_Domain_Values:
-
- Enumerated_Domain:
-
- Enumerated_Domain_Value: Qms/Tp
- Enumerated_Domain_Value_Definition: Thin marine sediment sheet overlies Purisima Formation
- Enumerated_Domain_Value_Definition_Source: This report
- Attribute_Domain_Values:
-
- Enumerated_Domain:
-
- Enumerated_Domain_Value: Qms/Tsc
- Enumerated_Domain_Value_Definition: Thin marine sediment sheet overlies Santa Cruz Mudstone
- Enumerated_Domain_Value_Definition_Source: This report
- Attribute_Domain_Values:
-
- Enumerated_Domain:
-
- Enumerated_Domain_Value: Tp
- Enumerated_Domain_Value_Definition: Purisima Formation
- Enumerated_Domain_Value_Definition_Source: This report
- Attribute_Domain_Values:
-
- Enumerated_Domain:
-
- Enumerated_Domain_Value: Tsc
- Enumerated_Domain_Value_Definition: Santa Cruz Mudstone
- Enumerated_Domain_Value_Definition_Source: This report
- Attribute_Domain_Values:
-
- Enumerated_Domain:
-
- Enumerated_Domain_Value: Tu
- Enumerated_Domain_Value_Definition: Tertiary sediments, undivided
- Enumerated_Domain_Value_Definition_Source: This report
- Attribute_Domain_Values:
-
- Enumerated_Domain:
-
- Enumerated_Domain_Value: KJf
- Enumerated_Domain_Value_Definition: Franciscan Complex, undivided
- Enumerated_Domain_Value_Definition_Source: This report
- Attribute:
-
- Attribute_Label: MapUnitAbb
- Attribute_Definition: short description of map unit
- Attribute_Definition_Source: This report
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: text description of map unit
- Attribute:
-
- Attribute_Label: Area
- Attribute_Definition: Area of feature in internal units squared.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: Positive real numbers that are automatically generated.
- Distribution_Information:
-
- Distributor:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: U.S. Geological Survey
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: 345 Middlefield Rd
- City: Menlo Park
- State_or_Province: CA
- Postal_Code: 94025-3561
- Country: USA
- Contact_Voice_Telephone: (650) 329-4309
- Distribution_Liability:
-
These databases, identified as bathymetry and shaded-relief maps of Offshore Bolinas map area, California have been approved for release and publication by the U.S. Geological Survey (USGS). Although these databases have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
These data are not intended for navigational use.
- Standard_Order_Process:
-
- Digital_Form:
-
- Digital_Transfer_Information:
-
- Format_Name: SHP
- Format_Version_Number: ArcMap (version 10.0, ESRI , 2011)
- Format_Specification:
-
Point, line, and polygon features are in shapefile format and are projected in UTM Zone 10 coordinates, with datum WGS84.
- Format_Information_Content:
-
The .zip file for a shapefile includes the .aux, .dbf, .shp, .shx, .sbx, and .sbn files, as well as the text (.txt) and XML (.shp.xml) versions of the metadata for the Geology data layer of Offshore Bolinas, California.
- File_Decompression_Technique: WinZip
- Transfer_Size: 1.1
- Digital_Transfer_Option:
-
- Online_Option:
-
- Computer_Contact_Information:
-
- Network_Address:
-
- Network_Resource_Name:
-
<https://pubs.usgs.gov/ds/781/OffshoreBolinas/data/Geology_OffshoreBolinas.zip>
- Network_Resource_Name: <https://pubs.usgs.gov/ds/781/>
- Access_Instructions: Data can be downloaded via the World Wide Web (WWW)
- Fees: none
- Technical_Prerequisites:
-
The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing an Esri ArcMap SHP. Users should download the ArcGIS Project File, OffshoreBolinasGIS.mxd.zip, a compressed (with the "zip" command) version of the ArcMap document (.mxd) that has all the data layers loaded in the table of contents for "Offshore Bolinas" and has all the data symbolized as on the OFR map sheets. Download and save this ArcGIS project file, including all data layers, to the directory the user has created for this GIS.
- Metadata_Reference_Information:
-
- Metadata_Date: 20140211
- Metadata_Review_Date: 20140908
- Metadata_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology Program
- Contact_Person: Stephen R. Hartwell
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: 400 Natural Bridges Drive
- City: Santa Cruz
- State_or_Province: CA
- Postal_Code: 95060-5792
- Country: US
- Contact_Voice_Telephone: 831-460-7814
- Contact_Facsimile_Telephone: 831-427-4748
- Contact_Electronic_Mail_Address: shartwell@usgs.gov
- Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.9.16 on Tue Jul 28 16:54:57 2015