Identifier: GEOUNIT
Title: California North Coast Geology - Private Forestlands
Originator: California Department of Conservation, Division of
Mines and Geology; California Department of Forestry
and Fire Protection
Edition: 1
Publication Date: 19991101
Information
Resource Type: Spatial data
Scale: 1:24,000
Other Citation
Abstract: Geologic units and geomorphic features were mapped
by the California Department of Conservation Division of Mines and
Geology in the early 1980's, in cooperation with California Department
of Forestry and Fire Protection, the Environmental Protection Agency,
California Department of Water Resources, California Department of
Parks and Recreation, California Department of Water Resources, and
the State Water Resources Control Board. The mapping effort covered
most North Coast private forestlands and included 60 7.5' quadrangles.
The maps were digitized in cooperation with the California Department
of Forestry and Fire Protection in the early 90's and are available in
GIS format. As part of this project, two distinct product series were
created, each with unique metadata: 1) geology 2) geomorphic features.
Each product series contains GIS data layers, symbology layers and AML
(ArcInfo Macro Language) programs for map generation, and graphics
(PDF) files for each quad. The graphics files show geologic units
overlain on contours, public land survey, roads, and other features
that were extracted from scanned 7.5' U.S. Geological Survey
topographic maps.
Purpose: The maps were originally created in response to the
Clean Water Act (1972) requirements that each state develop plans to
control sources of water pollution, including those related to
silvicultural practices and natural runoff that occurs in forested
areas. The maps/data are useful in preparation of Timber Harvesting
Plans, and for use by land managers for identifying areas of
potentially unstable ground. The maps/data serve as a guide to
potential problem areas where more site-specific review is required.
Supplemental
Information: Bedrossian, Trinda L. Watershed Mapping in
Northern California. California Geology, June 1983. Bedrossian,
Trinda L. Watershed Mapping in Northern California, an update.
California Geology, February 1986.
Time Period: Start: 1982 End: 1985
Currentness: Ground Condition
Progress: Complete
Update Frequency: Irregular
Bounding Box: -124 45 00, 38 45 00
-123 37 30, 42 00 00
Themes: Earth Sciences Landslides
Watersheds Geology
Mines & Mineral Resources Erosion
Forests & Forestry Water Quality
Access No restrictions
Limitations:
Limits on Use: The State of California, the Department of Forestry
and Fire Protection, and the Department of Conservation make no
representations or warranties regarding the accuracy of data or maps.
Neither the State nor the Departments shall be liable under any
circumstances for any direct, special, incidental, or consequential
damages with respect to any claim by any user or third party on
account of or arising from the use of data or maps.
Users should cite the Departments of Conservation and Forestry and
Fire Protection as the original source of the data, but clearly denote
cases where the original data have been updated, modified, or in any
way altered from the original condition.
There are no restrictions on distribution of the data or reproduction
of maps created from the graphics files. However, users are encouraged
to refer others to the Department of Conservation to acquire the data,
in case updated data become available.
Data Contact: Kit Custis 916-324-1236
kcustis@consrv.ca.gov
Size (MB): The entire geology and geomorphic features product
series can be obtained on a single CD-ROM. Each
graphics (PDF) file averages 1 MB.
Native Format: ARC/INFO Export
Distributor Division of Mines and Geology, Information Desk
801 K St. MS 14-34
Sacramento, Ca. 95814
916-445-5716
Metadata Date: 19991101
Metadata Contact: Joy Arthur 916-327-1042
jarthur@consrv.ca.gov
DATA DICTIONARY
Geology products are provided on a single CD-ROM which contains the
following directories:
GEO_COVS: contains the GIS data layers associated with geology and
geomorphic features.
PLOT: contains fonts, custom symbolsets, logos, key legend files,
symbology layers, and AMLs needed to create geology maps
You should create a directory on your local drive, and copy the PLOT
and GEO_COVS directories into it. The PLOT directory contains AMLs
that must be run within the PLOT directory, and that look for data in
a sister directory called GEO_COVS.
You are not required to copy the PDF directory to a local drive. The
CD can be used to store the graphics files for individual retrieval
when needed.
Each of the main geology products (data layer, AML, graphics file,
etc.) is documented below.
**********************************************************************
COVERAGE NAME: GEOUNIT
PURPOSE: This coverage contains polygons representing "geologic
units", with lithologic contact and quad/study boundary coding as line
attributes.
FEATURE TYPES: POLYGON, LINE
DATABASE FIELDS (polygon attributes):
INPUT OUTPUT DATA DECI
FIELD NAME WIDTH WIDTH TYPE MALS DESCRIPTION
----------- ----- ----- ---- ---- -----------------
UNITCODE 10 10 C - Abbreviated geologic unit
name
FIELD NAME: UNITCODE (lookup table UNITCODE.LUT contains these
descriptions)
UNITCODE DESCRIPTION
--------- ----------------------------------------
KJfbf Franciscan Complex, Broken Formation
KJfr Franciscan Schist of Redwood Creek
KJfs Central Belt Franciscan Complex, sedimentary rocks
KJfsc sandstone and melange unit of Snow Camp Mountain
KJfsc-ss sandstone block within melange unit of
Snow Camp Mountain
Kga Gualala Formation, Anchor Bay Member
Kus White Rock sandstone
Mgs Galloway-Schooner Gulch Formation
Mmy Monterey Group
Pgr German Rancho Formation
Por Ohlson Ranch Formation
Q undivided Quaternary sedimentary rocks
QTfa Falor Formation
QTrd Rio Dell Formation
QTsb Scotia Bluffs Sandstone
QTwu Wildcat Group, undifferentiated
Qac alluvial fan/colluvium
Qal alluvium
Qb Battery Formation
Qbs beach and dune sand
Qc Carlotta Formation
Qe estuarine deposits
Qf alluvial fan deposits
Qfp-Qmts flood plain deposits-marine terrace deposits
Qh Hookton Formation
Ql lacustrine deposits
Qmts marine terrace deposits
Qmts-c marine terrace deposits, Caspar Point
Qmts-f marine terrace deposits, Caspar Railroad
Qmts-f marine terrace deposits, Fern Creek
Qmts-h marine terrace deposits, Hans Jenny pit
Qmts-j marine terrace deposits, Jug Handle Farm
Qmts-l marine terrace deposits, lower Caspar Orchard
Qmts-r marine terrace deposits, Caspar Railroad
Qmts-u marine terrace deposits, upper Caspar Orchard
Qoal older alluvium
Qods older dune sands
Qoe older estuarine deposits
Qort older river terrace deposit
Qr Rohnerville Formation
Qrt river terrace deposits
Qsc stream channel deposits
Qt terrace deposits
Qta Anderson Valley Alluvium
Qtrd-Ter undifferentiated Rio Dell Formation and
Eel River Formation
TKfs Coastal Belt Franciscan Complex
TKfs-gs Coastal Belt Franciscan Complex, greenstone
TKfs-ls Coastal Belt Franciscan Complex, limestone
TKfs-ss Coastal Belt Franciscan Complex, sandstone
TKfs-sz Coastal Belt Franciscan Complex, shear zone
TKfs-u Coastal Belt Franciscan Complex, undetermined
TKy Yager Formation
Ter Eel River Formation
Tmx Tertiary marine sedimentary rocks, undifferentiated
Tp Pullen Formation
Ts sandstone
Tsg St. George Formation
Tw Wimer Formation
af artificial fill
bm bay mud
d diorite
fg San Andreas fault zone gouge
fm Franciscan melange
fm-bs blueschist block within Franciscan melange
fm-cg conglomerate block within Franciscan melange
fm-ch chert block within Franciscan melange
fm-d diabase within Franciscan malange
fm-gb gabbro within Franciscan melange
fm-gs greenstone block within Franciscan melange
fm-gs,ch greenstone and chert block within Franciscan melange
fm-ls limestone
fm-ls limestone block within Franciscan melange
fm-sch Semi-schist and phyllite
fm-sch semi-schist and phyllite
fm-sch semischist or phyllite block within Franciscan melange
fm-sp serpentine block within Franciscan melange
fm-ss sandstone block within Franciscan melange
fm-u undifferentiated block within Franciscan melange
mv volcanic rocks
out out of study area
quarry quarry
sz shear zone
u undifferentiated block within Franciscan melange
water water
DATABASE FIELDS (line attributes):
INPUT OUTPUT DATA DECI
FIELD NAME WIDTH WIDTH TYPE MALS DESCRIPTION
----------- ----- ----- ---- ---- -----------------------------------
CONTACT 1 1 C - lithologic contact location
accuracy
FIELD NAME: CONTACT
CONTACT DESCRIPTION
------- -----------
k known location
a approximate location
c coastline
q quad/study area boundary
COORDINATE SYSTEM DESCRIPTION
Projection UTM
Units METERS Spheroid CLARKE1866
Parameters:
1st standard parallel 34 0 0.000
2nd standard parallel 40 30 0.000
central meridian -120 0 0.00
latitude of projection's origin 0 0 0.000
false easting (meters) 0.00000
false northing (meters) 0.00000
**********************************************************************
COVERAGE NAME: QUADS
PURPOSE: Used to set geographic extent of each map to a specific
quad, used to "mask out" features drawn beyond the specific quad
boundary.
FEATURE TYPE: POLYGON
DATABASE FIELDS:
INPUT OUTPUT DATA DECI
FIELD NAME WIDTH WIDTH TYPE MALS DESCRIPTION
----------- ----- ----- ---- ---- -----------------
QUADNAME 27 27 C - 7.5' quad name
FULLNAME 35 35 C - Same as QUADNAME, no abbrev.
USGSCODE 7 7 C - Standard USGS quad code
OFR 12 12 C - Div. of Mines & Geology map code
ALTNAME 35 35 C - Alternate 7.5' quad name (usually
the 15' quad name and quadrant)
***********************************************************************
COVERAGE NAME: QUAD_UNITS
PURPOSE: Overlay of GEOUNITS coverage and QUADS, used for labelling
geologic units to ensure each polygon that appears in a quad gets a
text label.
FEATURE TYPE: POLYGON
DATABASE FIELDS:
INPUT OUTPUT DATA DECI
FIELD NAME WIDTH WIDTH TYPE MALS DESCRIPTION
----------- ----- ----- ---- ---- -----------------
UNITCODE 10 10 C - Abbreviated geologic unit name
(UNITCODE contains the same codes as GEOUNIT coverage)
**********************************************************************
COVERAGE NAME: GEOLINES
PURPOSE: This coverage contains "linear" data (faults, lithologic
contacts etc.).
FEATURE TYPE: LINE
DATABASE FIELDS:
INPUT OUTPUT DATA DECI
FIELD NAME WIDTH WIDTH TYPE MALS DESCRIPTION
---------- ----- ------ ---- ---- ----------------------
FEATURE 20 20 C - Feature Description
ACT-DOR 1 1 C - Active/Dormant coding (if
applicable)
TYPE 1 1 C - Locational accuracy (if applicable)
DIP 2 2 I - Dip angle of fault (if applicable)
FIELD NAME: FEATURE
FEATURE DESCRIPTION
--------- ------------
Anticlinal-axis Anticlinal-axis
Fault Fault
Gradational-contact Gradational-contact
Lineament (photo) Lineament (photo)
Scarp Scarp
Slip-fault Slip-fault
Synclinal-axis Synclinal-axis
Thrust-fault Thrust-fault
FIELD NAME: ACT-DOR
ACT-DOR DESCRIPTION
------- ----------------
a active feature
d dormant feature
FIELD NAME: TYPE
TYPE DESCRIPTION
------ -----------------
k known location
a approximate, infered or queried location
**********************************************************************
COVERAGE NAME: GEOPOINTS
PURPOSE: This coverage contains "point" data such as mine, spring and
quarry locations.
FEATURE TYPE: POINT
DATABASE FIELDS:
INPUT OUTPUT DATA DECI
FIELD NAME WIDTH WIDTH TYPE MALS DESCRIPTION
---------- ----- ------ ---- ---- ----------------------
FEATURE 20 20 C - Feature Description
DIP 5 5 C - Dip angle of Strike (if applicable)
ANGLE 3 3 I - Angle of Strike measured from North
in direction of dip (if applicable)
FIELD NAME: FEATURE
FEATURE DESCRIPTION
-------------- -------------------
Dipbed Strike and Dip of Bedding
Dipbed-approx Approximate Strike and Dip of Bedding
Dipfault Strike and Dip of Fault
Dipfrac Strike and Dip of Fracture or Shear
Dipover Strike and Dip of Overturned Bedding
Dipvert Strike and Dip of Vertical Bedding
Dipvrtfrac Strike of Vertical Fracture or Shear
Horiz-bed Horizontal Bedding
Borrow Borrow Pit
Marsh Marsh
Mine Mine
Outcrop Rock Outcrop (undetermined or unitcode)
Quarry Quarry
Spring Spring
Spring-mineral Spring
Spring-sulfur Spring
Spring-thermal Spring
Well Well
**********************************************************************
COVERAGE NAME: ACLIN_SYM
PURPOSE: coverage used to create legend symbol only.
**********************************************************************
COVERAGE NAME: SCLIN_SYM
PURPOSE: coverage used to create legend symbol only.
**********************************************************************
COVERAGE NAME: SFLT_SYM
PURPOSE: coverage used to create legend symbol only.
**********************************************************************
COVERAGE NAME: GEOSYM
PURPOSE: Contains linear features that are used to create standard
geologic map symbols.
FEATURE TYPE: LINE
DATABASE FIELDS:
INPUT OUTPUT DATA DECI DESCRIPTION
FIELD NAME WIDTH WIDTH TYPE MALS
----------- ----- ------ ---- ---- -----------------------
ACT-DOR 1 1 C - Active/dormant coding
SYM 1 1 C - line symbol coding
ARROW 4 4 I - Arrowhead type
FIELD NAME: ACT-DOR
ACT-DOR DESCRIPTION
------- -----------
a active feature
d dormant feature
FIELD NAME: SYM
SYM DESCRIPTION
--- -----------
d anticline, syncline, fault direction and fault-dip arrows
f thrust fault directional arrows
FIELD NAME: ARROW
ARROW DESCRIPTION
----- -----------
4 arrowhead symbol (used in arcplot) for anticline,
syncline, fault direction and faultdip arrows
**********************************************************************
AML NAME: geology.aml
PURPOSE: This AML creates 1:24,000 scale 7.5' quad geology maps.
Everything needed by this AML should be included, except for the
"backdrop" images of contour lines. The AML line that draws this image
has been commented out. It can be activated if the user has access to
backdrops of contours or other desired features.
**********************************************************************
FILE NAME: "quad_name".pdf (the standard USGS quad name is used with
any blanks replaced with an underscore)
PURPOSE: Provides 7.5' quad geology map products that can be
downloaded and plotted
**********************************************************************
DOCUMENTATION DATES:
February, 2001: Reprojected to UTM NAD27 (no shift), and clipped to KRIS Project study area.
Contact Name: P. J. Trichilo
Institute for Fisheries Resources (IFR)
791 Eighth Street
Arcata, CA 95521
Contact's Phone: (707) 822-9428