California Department of Mines and Geology Metadata for North Coast                      

Geology Map Information

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: 1999/11/01

Information

Resource Type: Spatial data

Scale: 1:24,000

Other Citation

Details: Map projection is Albers Equal Area, NAD27

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 (Arc Info 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 ALBERS (TEALE)

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) -4000000.0000

**********************************************************************

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

**********************************************************************