Geologic map of the Sawmill Mountain quadrangle, Kern and Ventura Counties, California

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Frequently anticipated questions:

What does this data set describe?

Title:
Geologic map of the Sawmill Mountain quadrangle, Kern and Ventura Counties, California
Abstract:
The Sawmill Mountain quadrangle is located in the western Transverse Ranges of California, about 10 km west of Frazier Park. It includes Mt. Pinos, Mt. Abel (Cerro Noroeste), a part of the southern San Emigdio Mountains, and straddles an eleven-kilometer reach of the nearly east-west striking "Big Bend" section of the San Andreas Fault.
South of the San Andreas Fault, the oldest rocks include undated amphibolite-grade biotite and hornblende-biotite gneiss that is probably early or middle Proterozoic in age. The older gneiss is intruded by strongly deformed and foliated biotite orthogneiss that has an age on biotite of 67.2+0.5 Ma (Late Cretaceous). Several other weakly foliated to massive Late Cretaceous granitic plutons intrude the orthogneiss, one of which has a 40Ar/39Ar on biotite of 65.9+0.2 Ma. The youngest granitic pluton, the coarse-grained, locally porphyritic granite of Mt. Pinos, is undated, but assumed to be Late Cretaceous in age. These granitic and gneissic rocks were thrust northward over Pelona Schist, which has a 40Ar/39Ar age on muscovite of 63.24+0.26 Ma. All crystalline rocks were subsequently thrust westward on the Abel Mountain thrust over rocks of the Miocene Caliente Formation.
A thick section of Eocene to Pliocene sedimentary and igneous rocks is exposed in the quadrangle. In the south part of the quadrangle, lacustrine and fluvial sediments and basaltic volcanic rocks of the Plush Range Formation are in fault contact with Eocene marine shales and, across the Big Pine fault, are mostly in fault contact with rocks of the Miocene Caliente Formation; locally, the Caliente unconformably overlies the rocks of the Plush Ranch Formation. The Caliente is unconformably overlain by the distinctive Lockwood Clay, which is successively overlain by the Pliocene Quatal and Morales Formations.
Rocks north of the San Andreas Fault are mostly Early Cretaceous tonalite and granodiorite containing strongly hornfelsed roof pendants of marble, metasandstone, and metapelite. Some of these rocks have been thrust over a mid-Tertiary marine section of sandstones and silicic shales.
The San Andreas Fault zone is as wide as 0.7 km and occupies a valley across most of the quadrangle. It is characterized by linear scarps, grabens, sag ponds and contains several enigmatic fault-bounded phacoids of exotic rocks apparently derived from many kilometers east of the quadrangle. Many of the prominent scarps probably resulted from the giant Ft. Tejon earthquake of 1859.
Supplemental_Information:
ArcInfo coverages, shapefiles and basemap image included in this dataset: 
smpoly (.shp)
smpoint (.shp)
smline (.shp)
smsym (.shp) map 'decorations' if desired
sawmillbase.tif (.tfw)
  1. How might this data set be cited?
    Kellogg, Karl S., and Miggins, Daniel P., 2002, Geologic map of the Sawmill Mountain quadrangle, Kern and Ventura Counties, California: U.S. Geological Survey Open-File Report 02-406, U.S. Geological Survey, Denver, CO.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -119.25
    East_Bounding_Coordinate: -119.125
    North_Bounding_Coordinate: 34.875
    South_Bounding_Coordinate: 34.75
  3. What does it look like?
    http://pubs.usgs.gov/of/2002/ofr-02-406/ofr-02-406.pdf (PDF)
    Printable representation of the map layout, 2.7 megabytes
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2002
    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?
    2. What coordinate system is used to represent geographic features?
      The map projection used is Lambert Conformal Conic.
      Projection parameters:
      Standard_Parallel: 35.46666666667
      Standard_Parallel: 34.03333333333
      Longitude_of_Central_Meridian: -118
      Latitude_of_Projection_Origin: 0
      False_Easting: 0
      False_Northing: 0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 1.399974942207
      Ordinates (y-coordinates) are specified to the nearest 1.399974942207
      Planar coordinates are specified in Meters
      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview: 
    Coverage names in this dataset:
SMPOLY
SMLINE
SMPOINT

SMPOLY.PAT:<

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  AREA                   4    12     F      3
    5  PERIMETER              4    12     F      3
    9  SMPOLY#                4     5     B      -
   13  SMPOLY-ID              4     5     B      -
   17  TEXT                   6     6     C      -
   23  SYMBOL                 4     4     I      -
   27  DESCRIPTION          125   125     C      -

ITEM EXPLANATIONS:
TEXT - geologic unit label
SYMBOL - unique number given to map unit representing color value taken from shadeset 'color524.shd'
DESCRIPTION - brief geologic explanations of map units

TEXT    SYMBOL  DESCRIPTION
JXma	259	Marble (Jurassic? to Lower Proterozoic?)
JXqz	205	Quartzite (Jurassic? to Lower Proterozoic?)
KXgb	66	Granite of Cerro Noroeste and biotite gneiss, undivided (Cretaceous and lower Proterozoic)
KXmg	504	Migmatitic biotite gneiss (Cretaceous? and Lower Proterozoic)
Kgbx	483	Green silicified sedimentary rocks (Cretaceous?)
Kgd	171	Quartz diorite and granodiorite (Cretaceous)
Kgdg	98	Granodiorite gneiss (Cretaceous?)
Kgp	79	Granite of Mt. Pinos (Cretaceous)
Kgpb	76	Border phase (Cretaceous)
Kgr	146	Granitic rocks (Cretaceous)
Kgrn	135	Granite of Cerro Noroeste (Cretaceous)
Kgro	62	Orange granite (Cretaceous)
MzPzhf	75	Hornfels (Jurassic, Triassic and/or late Paleozoic)
MzPzmg	287	Gray marble (Jurassic, Triassic and/or late Paleozoic)
MzPzms	67	Meta-sandstone (Jurassic, Triassic and/or late Paleozoic)
MzPzmw	307	White marble (Jurassic, Triassic and/or late Paleozoic)
MzPzqz	356	Quartzite (Jurassic, Triassic and/or late Paleozoic)
QTgo	450	Fault gouge (Holocene to Miocene)
Qa	3	Alluvium (Holocene)
Qac	7	Alluvium and colluvium (Holocene)
Qae	52	Alluvium of San Emigdio Mesa (middle Pleistocene)
Qc	18	Colluvium (Holocene)
Qd	24	Diamicton (middle? Pleistocene)
Qf1	486	Younger fan deposit (Holocene)
Qf2	485	Older fan deposits (Holocene and upper Pleistocene)
Qf3	490	Highly dissected fan deposits (middle? Pleistocene)
Qls	32	Landslide deposits (Holocene and/or upper Pleistocene)
Qlsr	33	Recent landslide deposit (Holocene)
Qw	452	Wetland deposits (Holocene)
TKmbx	479	Mylonite breccia (lower Tertiary to Cretaceous?)
Tca	156	Arkosic member of Caliente Formation (Miocene)
Tcc	131	Volcanic-clast conglomerate member of Caliente Formation (Miocene)
Tcg	97	Granite-clast conglomerate member of Caliente Formation (Miocene)
Tcp	163	Sedimentary breccia and sandstone of Cowhead Potrero (Miocene)
Tcr	129	Red sandstone and siltstone member of Caliente Formation (Miocene)
Tcu	147	Upper Caliente Formation, undifferentiated (Miocene)
Tcw	131	White sandstone and conglomerate member of Caliente Formation (Miocene)
Tlc	143	Lockwood Clay (Pliocene?)
Tm	386	Morales Formation (Pliocene)
Tmsh	399	Marine shale (lower Eocene)
Tmy	341	Abel Mountain mylonite (Paleocene?)
Tpb	191	Granite-and gneiss-breccia facies of Plush Ranch Formation (lower Miocene and upper Oligocene)
Tpba	154	Basalt member of Plush Ranch Formation (lower Miocene and upper Oligocene)
Tpbn	214	Gneiss-breccia facies of Plush Ranch Formation (lower Miocene and upper Oligocene)
Tpbx	202	Granite megabreccia member of Plush Ranch Formation (lower Miocene and upper Oligocene)
Tpl	231	Lacustrine member of Plush Ranch Formation (lower Miocene and upper Oligocene)
Tps	227	Pelona Schist (Paleocene)
Tqb	326	Brown member of Quatal Formation (Pliocene)
Tqw	295	White arkosic sandstone member of Quatal Formation (Pliocene)
Ts	136	Simmler Formation (lower Miocene to upper Eocene)
Tt	84	Temblor Formation (middle? Miocene)
Twa	123	White arkosic sandstone and conglomerate (Miocene?)
Xag	92	Biotite augen gneiss (Lower Proterozoic)
Xbg	93	Biotite gneiss (Lower Proterozoic)
Xbhg	71	Biotite-hornblende gneiss (Lower Proterozoic)

SMPOLY.AAT:<

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  FNODE#                 4     5     B      -
    5  TNODE#                 4     5     B      -
    9  LPOLY#                 4     5     B      -
   13  RPOLY#                 4     5     B      -
   17  LENGTH                 4    12     F      3
   21  SMPOLY#                4     5     B      -
   25  SMPOLY-ID              4     5     B      -
   29  DESCRIPTION           80    80     C      -
  109  SYMBOL                 5     5     I      -

ITEM EXPLANATIONS:
SYMBOL - unique number given to line feature representing values taken from lineset 'geol_sfo.lin'
DESCRIPTION - description of line features, using digital cartographic standards

SYMBOL  DESCRIPTION
1	contact-certain
2	contact-approximately located
173	contact-certain
216	fault-approximately located
227	map boundary

SMLINE.AAT:<

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME     INDEXED?
    1  FNODE#                 4     5     B      -                        -
    5  TNODE#                 4     5     B      -                        -
    9  LPOLY#                 4     5     B      -                        -
   13  RPOLY#                 4     5     B      -                        -
   17  LENGTH                 4    12     F      3                        -
   21  SMLINE#                4     5     B      -                        -
   25  SMLINE-ID              4     5     B      -                        -
   29  DESCRIPTION           80    80     C      -                        -

ITEMS EXPLANATIONS:
DESCRIPTION - description of line features, using digital cartographic standard

DESCRIPTION
anticline-certain
anticline-concealed
contact-concealed
cross section
fault-concealed
landslide scarp-certain
normal fault-concealed
normal fault-concealed, queried
reverse fault-concealed
syncline-certain
syncline-concealed
thrust fault-concealed

SMPOINT.PAT:<

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME     INDEXED?
    1  AREA                   4    12     F      3                        -
    5  PERIMETER              4    12     F      3                        -
    9  SMPOINT#               4     5     B      -                        -
   13  SMPOINT-ID             4     5     B      -                        -
   17  DESCRIPTION           80    80     C      -                        -
   97  ROTATION               7     7     I      -                        -
  104  INCLINATION            5     5     I      -                        -

ITEM EXPLANATIONS:
DESCRIPTION - description of point features,  using digital cartographic standard
ROTATION - compass direction of bedding trend, in degrees
INCLINATION - angle of bedding dip, in degrees from horizontal

DESCRIPTION
anticline symbol
ball & bar symbol
dip tic symbol
fault dip symbol
fold plunge arrow symbol
horizontal bedding
inclined bedding-showing approximate strike and dip
inclined bedding-showing strike and dip
inclined bedding-showing strike and dip, top direction of beds known
inclined foliation-showing approximate strike and dip
inclined foliation-showing strike and dip
lineation-showing bearing and plunge
overturned anticline symbol
overturned bedding-showing strike and dip
overturned bedding-showing strike and dip, top direction of beds known
sample locations
syncline symbol
vertical bedding-showing strike
vertical bedding-showing strike, top of beds known
vertical foliation-showing strike

ROTATION
range of values: 0 - 359

INCLINATION
range of values: 0 - 90
    Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/of/2002/ofr-02-406/ofr-02-406_pamphlet.pdf

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Karl S. Kellogg
    • Daniel P. Miggins
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Karl Kellogg
    U.S. Geological Survey
    mailstop 980
    Box 25046, Denver Federal Center
    Denver, CO
    USA

    303-236-1305 (voice)
    303-236-0214 (FAX)
    kkellogg@usgs.gov

Why was the data set created?

To update and reinterpret earlier geologic mapping, and to achieve a uniform regional geologic database.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 1999 (process 1 of 7)
    Polygons, lines, and points representing geologic features and data points were digitized from scale-stable compilation materials using the GSMCAD public domain program (USGS Open-File Report 96-007).
    Date: 2000 (process 2 of 7)
    The map data were exported to ARC/INFO using the GSMCAD export function to create ARC generate ASCII files. The ASCII files were then imported into ArcInfo using the GENERATE routine, and polygon topology built.
    Date: 2000 (process 3 of 7)
    Text map unit descriptors were added to the .AAT and .PAT database files for each coverage.
    Date: 2001 (process 4 of 7)
    Draft check plots of the geologic map and explanation were created and submitted for peer review. Geologists reviewed the plots for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Revisions were made to the geospatial database as needed.
    Date: 2002 (process 5 of 7)
    The geospatial database files and metadata were quality checked for completeness and consistency.
    Date: 16-Sep-2002 (process 6 of 7)
    First draft of metadata created by paco vansistine using FGDCMETA.AML ver. 1.32 01/11/99
    Date: 16-Sep-2002 (process 7 of 7)
    Creation of original metadata record Person who carried out this activity:
    U.S. Geological Survey
    Attn: Paco VanSistine
    U.S. Geological Survey
    MailStop 980 - Denver Federal Center
    denver, CO
    USA

    303-236-5452 (voice)
    dsistine@usgs.gov
  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?
    Data was entered and checked by the geologist who made the observations. The attributes of this geospatial data set consist of text identifiers and numeric codes that indicate the identity of the geologic unit or type of geologic feature, and determine how each feature is colored or symbolized. To check attribute accuracy, a color check plot was visually compared to the geologist's original compilation. Discrepancies between the digital geospatial dataset and the original analog compilation were corrected as needed. Machine-created listings of unique attribute values were used to identify spelling errors or other inconsistencies, and corrections were made as needed. This map was been thoroughly reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature.
  2. How accurate are the geographic locations?
    Lines were primarily mapped by ground investigation and photointerpretation of 1:24,000-scale color aerial photographs. These lines were digitized from the topographic field sheets and from annotated aerial photographs. Most digitized positions on the map are estimated to have about 20 m horizontal accuracy. Additional point observations were added using positions determined by a Rockwell PLGR-96 GPS unit with horizontal accuracy of about 10 meters. There is no elevation data in the database.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    No features were eliminated or generalized. Unit properties are described in the text explanation.
  5. How consistent are the relationships among the observations, including topology?
    Polygon and chain-node topology present. Map elements were visually checked by the author for overshoots, undershoots, duplicate features, polygon attributes, and other errors. Automated (ARC/INFO) routines were also used to check the databases for polygon label errors, line or point attribution errors, sliver polygons, dangling arcs, intersection errors, and projection information. The map was reviewed by one other geologist for consistency with basic geologic principles and general conformity to USGS mapping standards.

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. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    USGS Information Services
    Box 25286
    Denver, CO
    USA

    1-888-ASK-USGS (voice)
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.
    The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 05-Feb-2016
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata ("CSDGM version 2") (FGDC-STD-001-1998)
This page is <https://geo-nsdi.er.usgs.gov/metadata/open-file/02-406/metadata.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:06:10 2018