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Preliminary geologic map of the Canoga Park 7.5' quadrangle, southern California: A digital database

Frequently anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How should this data set be cited?

   Yerkes, R. F. , and Campbell, R. H. , 1995, Preliminary geologic map of the Canoga Park 7.5' quadrangle, southern California: A digital database: U.S. Geological Survey Open-File Report 95-90.

   Online Links:

   • <https://pubs.usgs.gov/of/1995/of95-090/>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -118.63

   East_Bounding_Coordinate: -118.50

   North_Bounding_Coordinate: 34.25

   South_Bounding_Coordinate: 34.13

3. What does it look like?

4. Does the data set describe conditions during a particular time period?

   Calendar_Date: 1995

   Currentness_Reference: publication date

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: map

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

      This is a vector data set. It contains the following vector data types (SDTS terminology):

      • entity point
      • complete chain
      • GT-polygon composed of chains

   2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: California state plane coordinate system

      State_Plane_Coordinate_System:

      SPCS_Zone_Identifier: 3426

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest unknown
      Ordinates (y-coordinates) are specified to the nearest unknown
      Planar coordinates are specified in meters

7. How does the data set describe geographic features?

   CP-GEOL.PAT

   Geologic map units symbols (no full descriptions found) (Source: OFR-95-90)

   CP-GEOL.AAT

   Linear geologic features (Source: OFR-95-90)

   LTYPE

   Line type (Source: OFR-95-90)

   Value	Definition
   contact, approx. located	Contact whose position is not precisely located
   contact, certain	Observed geologic contact
   detachment fault, approx. located	Detachment fault whose position is not precisely known
   fault, approx. located	Fault whose position is not precisely known
   fault, concealed	Concealed fault whose position is inferred
   map boundary, certain	Boundary of mapped area

   CP-GEOL.PAT

   Geologic map units at specific locations (same attributes as polygon coverage CP-GEOL.PAT) (Source: OFR-95-90)

   CP-STRC.AAT

   fold axes (Source: OFR-95-90)

   LTYPE

   Line type (Source: OFR-95-90)

   Value	Definition
   f.a., anticline, approx. located	Anticlinal fold axis whose position is not precisely known
   f.a., syncline, approx. located	Synclinal fold axis whose position is not precisely known

   CP-STRC.PAT

   Strike and dip information of bedding (Source: OFR-95-90)

   PTTYPE

   Point type (Source: OFR-95-90)

   Value	Definition
   bedding	Bedding orientation
   ot bedding	Overturned bedding

   DIP

   Dip of bedding (Source: OFR-95-90)

   Range of values
   Minimum:	2
   Maximum:	82
   Units:	degrees
   Resolution:	1

   STRIKE

   Strike of bedding (Source: OFR-95-90)

   Range of values
   Minimum:	18
   Maximum:	355
   Units:	degrees
   Resolution:	1

   CP-FOSS.PAT

   Fossil localities, supporting data given in Yerkes and Campbell (1993) (Source: OFR-95-90)

   PTTYPE

   Point type (No definitions found) (Source: OFR-95-90)

   SAMPNO

   Sample number (Source: OFR-95-90)

   Value	Definition
   fl81
   (blank)	No sample number

   QUAD

   Quadrangle abbreviated name (Source: OFR-95-90)

   Value	Definition
   CANPK	Canoga Park

   SEC

   Section number (Source: OFR-95-90)

   Range of values
   Minimum:	8
   Maximum:	34

   SOURCE

   Source of fossil localities information (Source: OFR-95-90)

   Value	Definition
   Hoots, 1931
   Ingle, 1967
   RFY, unpub.

   MAP_NO

   Point ID used on map (No definitions found) (Source: OFR-95-90)

   COLL-NO

   Collector's number (No definitions found) (Source: OFR-95-90)

   RW

   Range west (Source: OFR-95-90)

   Value	Definition
   16	16 range west

   AGE

   Age of fossil (symbol) (no definitions of symbols found) (Source: OFR-95-90)

   UNIT

   Geologic unit symbol (No definitions found) (Source: OFR-95-90)

   CP-WELLS.PAT

   Well localities, supporting data given in Yerkes and Campbell (1993), and Yerkes and Showalter (1990) (Source: OFR-95-90)

   PTTYPE

   Point type (Source: OFR-95-90)

   Range of values
   Minimum:	432
   Maximum:	475

   QUADRANGLE

   Quadrangle abbreviated name (Source: OFR-95-90)

   Value	Definition
   CanPk	Canoga Park

   MAP_NUMBER

   point ID used on map (Source: OFR-95-90)

   Range of values
   Minimum:	432
   Maximum:	475

   TOWNSHIP

   OFR-95-90 (Source: OFR-95-90)

   Value	Definition
   2N	Township 2N
   1N	Township 1N

   RANGE_WEST

   Range west (Source: OFR-95-90)

   Range of values
   Minimum:	16
   Maximum:	17
   Units:	range number
   Resolution:	1

   SECTION

   Section number (Source: OFR-95-90)

   Range of values
   Minimum:	14
   Maximum:	30
   Units:	sections
   Resolution:	1

   OPERATOR

   Operator name (No definitions found) (Source: OFR-95-90)

   NAME/NUMBER

   name/number of well (No definitions found) (Source: OFR-95-90)

   ELEV.

   Elevation (ft.) (Source: OFR-95-90)

   Range of values
   Minimum:	805
   Maximum:	1425
   Units:	feet
   Resolution:	1

   YEAR

   year drilled (Source: OFR-95-90)

   Range of values
   Minimum:	1921
   Maximum:	1970
   Units:	year
   Resolution:	1

   TD

   Total depth (ft.) (Source: OFR-95-90)

   Range of values
   Minimum:	476
   Maximum:	7323
   Units:	feet
   Resolution:	1

   BOTTOM

   Bottom-hole geology (No definitions found) (Source: OFR-95-90)

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • R. F. Yerkes
   • R. H. Campbell

2. Who also contributed to the data set?

   R. H. Campbell, Reston, VA assisted in field interpretations and compilation; P. K. Showalter and C. M. Wentworth supplied critical custom programming; and S. E. Graham updated supporting files for completeness and consistency and prepared this report.

3. To whom should users address questions about the data?
   Yerkes, Robert F
   USGS-GEO-WRG-NGM
   Mail Stop 975, USGS
   345 Middlefield Road
   Menlo Park, CA 94025
   US
   

   650-329-4946 (voice)
   ryerkes@usgs.gov
   

Why was the data set created?

To provide to the public a digital geologic map database of the Canoga Park 7.5' quadrangle, southern California.

How was the data set created?

1. From what previous works were the data drawn?

   Yerkes and Campbell (1993) (source 1 of 2)

   Yerkes, R.F., and Campbell, R.H., 1993, Preliminary geologic map of the Canoga Park 7.5' quadrangle, southern California: U.S. Geological Survey Open-File Report 93-206.

   Type_of_Source_Media: paper

   Source_Contribution:

   For detailed descriptions of the units, their stratigraphic relations, sources of geologic mapping, and data on exploratory wells consult Yerkes and Campbell (1993), and Yerkes and Showalter (1990).

   Yerkes and Showalter (1990) (source 2 of 2)

   Yerkes, R.F., and Showalter, P.K., 1990, Exploratory wells drilled in the Los Angeles, California 1:100,000 quadrangle, southern California: U.S. Geological Survey Open-File Report 90-627.

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 100000

   Source_Contribution:

   For detailed descriptions of the units, their stratigraphic relations, sources of geologic mapping, and data on exploratory wells consult Yerkes and Campbell (1993), and Yerkes and Showalter (1990).

2. How were the data generated, processed, and modified?

   Date: 1993 (process 1 of 1)

   The geologic map information was digitized from stable originals of the geologic maps at 1:24,000 scale. The author manuscripts (pencil on mylar) were scanned using a monochrome scanner with a resolution of 800 dots per inch. The scanned images were vectorized and transformed from scanner coordinates to projection coordinates with digital tics placed by hand at quadrangle corners. The scanned lines were edited interactively by hand using graphical user interface ALACARTE (Fitzgibbon, 1991, Fitzgibbon and Wentworth, 1991, Wentworth and Fitzgibbon, 1991). Scanning artifacts significant for display at a scale of 1:24,000 were corrected.
   
   The base map layer (cp-topo) was prepared by scanning a scale-stable composite negative image of the Canoga Park 7.5 minute topographic map (1967 edition). The negative was scanned using a monochrome scanner with a resolution of 400 dots per inch. The raster scan was converted to a GRID in ARC/INFO. The GRID was then vectorized and reprojected into State Plane Projection using the four corner tics as reference points. The arcs in the base layer have not been attributed.

3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?

2. How accurate are the geographic locations?

3. How accurate are the heights or depths?

4. Where are the gaps in the data? What is missing?

   This database is not sufficiently detailed or comprehensive to identify or characterize site- specific hazards represented by faults or landslides shown; the faults shown do not take the place of fault-rupture hazard zones designated by the California State Geologist (see Hart, 1988).

5. How consistent are the relationships among the observations, including topology?

   This digital map database is compiled from previously published sources combined with some new mapping and modifications in nomenclature. The geologic map database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U. S. Geological Survey. For detailed descriptions of the units, their stratigraphic relations and sources of geologic mapping consult Yerkes and Campbell (1993).

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None

Use_Constraints: None

1. Who distributes the data set? (Distributor 1 of 1)
   USGS Information Services
   Box 25286, Denver Federal Center
   Denver, Colorado 80255-0046
   USA
   

   1-888-ASK-USGS (voice)
   1-303-202-4695 (FAX)
   infoservices@usgs.gov
   

2. What's the catalog number I need to order this data set?

   USGS Open-File Report 95-90

3. What legal disclaimers am I supposed to read?

   This report is preliminary and has not been reviewed for conformity with U. S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U. S. Government.
   This database, identified as "Preliminary Geologic Map of the Canoga Park 7.5' Quadrangle, southern California: A Digital Database," has been approved for release and publication by the Director of the USGS. Although this database has been reviewed and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. This database is released on condition that neither the USGS nor the U. S. Government may be held liable for any damages resulting from its use.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:

     ARC/INFO export files Description of coverage cp-geol.e00 Depositional contacts, faults, and unit labels cp-strc.e00 Strike and dip information, fold axes cp-foss.e00 Fossil localities cp-topo.e00 Topographic base map taken from a scan of a composite negative of the Canoga Park 7.5 minute quadrangle (contour interval = 25 ft.) cp-wells.e00 Well Localities in format ArcInfo export (version 7.x) Size: 12 megabytes

     Network links:

     <https://pubs.usgs.gov/of/1995/of95-090/canpk.tar.gz>

   • Cost to order the data: none

5. Is there some other way to get the data?

   A compressed tar file of the geologic map database and related files can be obtained by sending a tape with request and return address to:
   

    Canoga Park, CA 7.5' Geologic Database c/o Database Coordinator US Geological Survey 345 Middlefield Road, M/S 975 Menlo Park, CA 94025 

   Do not omit any part of this address!
   The compressed tar file will be returned on the tape. The acceptable tape types are: 1/4 inch, 150 MB cartridge tape, 2.3 or 5.0 GB, 8 mm Exabyte tape.

Who wrote the metadata?

Dates:

Last modified: 08-Jun-2009

Metadata author:

Jennifer Lenz
US Geological Survey
12201 Surise Valley Drive, Mail Stop 918
Reston, VA 20192
USA

703-648-6974 (voice)
703-648-6560 (FAX)
pschweitzer@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)