Attribute_Accuracy:
Attribute_Accuracy_Report:
The combination of detailed and reconnaissance techniques used to generate the Yucaipa
quadrangle database yielded a data set whose quality necessarily varies from location to
location. Some areas were examined in great detail in order to solve specific geologic
problems or to clarify the description or geologic relations of a particular map unit.
Other areas were examined less carefully or were not examined at all. As a result, some
parts of the Yucaipa data set have greater attribute accuracy and attribute confidence
than others.
ATTRIBUTE ACCURACY
The attribute-accuracy statement for the Yuciapa database incorporates four elements:
(1) map-unit description and attribution, (2) geotechnical standards against which the
observations are measured, (3) map-unit identification, and (4) description of linear
and planar geologic structures.
Map-unit description and attribution:
Geologic-map units in the Yucaipa quadrangle database were described using standard
field methods (see Process_Description 1 of 6). Consistent with these methods and
consistent with the time available to assemble the data set, the database authors have
assigned standard geologic attributes to geologic lines, points, and polygons identified
in the database.
Geotechnical standards for geologic descriptions:
Plutonic rock classification: Plutonic rocks and their deformed equivalents are
classified in accordance with the International Union of Geological Sciences
Subcommission on the Systematics of Igneous Rocks (1973; Streckeisen, 1976).
Sedimentary rock classifications: Sandstones are classified in accordance with the
scheme suggested by Friedman and Sanders (1978, Table 7-4). For all sedimentary
materials, bedding-thickness classification follows Ingram (1954) and grain-size
classification follows Wentworth (1922).
Surficial-materials classification: Surficial materials are mapped and classified
according to a southern California-wide classification scheme being developed by the
Southern California Areal Mapping Project (SCAMP).
Terminology for slope-failure deposits (landslides and other slope-failure types)
follows Varnes (1978).
Color classification: The matrix color of surficial materials and their pedogenic soils
is classified according to the Munsell soil-color charts (Munsell, 1975). Bedrock
colors also are classified according to the Munsell system, supplemented by the
Rock-Color Chart distributed by the Geological Society of America (reprinted 1970).
Map-unit identification
Geologic-map units in the Yucaipa quadrangle represent packages of geologic materials
whose overall physical properties differ sufficiently from other such units as to
constitute discrete mappable entities. From localities where map units in the
quadrangle first were recognized and defined, they were extended to other areas through
a mapping process that includes (a) direct outcrop observation, (b) interpretation of
subsurface boring logs, and (c) aerial-photographic extrapolation into areas where site
observation was not conducted. The data contained in the coverage yuc_obs indicates the
density of observation and data localities in the Yucaipa quadrangle, and is a measure
of whether a map unit at a particular location was identified on the basis of hands-on
data or extrapolation.
Map-unit boundaries (geologic contacts) and faults identified along mapping traverses
typically were extended laterally by using aerial photographs and binoculars to project
or interpolate the contact or fault to its next recorded occurrence along a nearby
traverse. Only rarely were individual geologic contacts or fault lines walked out to
determine their variability and character throughout the map area. The bounding
contacts of each surficial unit and the location of fault scarps that traverse the units
were plotted by using a PG-2 photogrammetric plotter that allows location accuracy
equivalent to the accuracy standard for the topographic-contour base.
Description of geologic structures
Geologic structures (planar structures displayed as lines, and structures at specific
points) in the Yucaipa quadrangle are described and attributed according to the scheme
described by Matti and others (1997a,b). These classifications generally follow
conventional schemes for classifying geologic lines and points (Reynolds and others,
1995).
ATTRIBUTE CONFIDENCE
For digital version 1.0 of the database, the coverage yuc_obs is a proxy for attribute
confidence: the number of direct observations within a map unit from place to place in
the quadrangle proxies for the confidence with which the unit and its attributes are
believed to be accurately identified. Future releases of the Yucaipa data set will
delineate a more objective, empirical basis for map-unit identification and attribute
accuracy (map-unit and attribute confidence).
Friedman, G.M., and Sanders, J.E., 1978, Principles of sedimentology: New York, John
Wiley & Sons, 792 p.
Ingram, R.L., 1954, Terminology for the thickness of stratification and parting units in
sedimentary rocks: Geological Society of America Bulletin, v. 65, p. 937-938.
International Union of Geological Sciences Subcommission on the Systematics of Igneous
Rocks, 1973, Plutonic rocks: Geotimes, v. 18, no. 10, p. 26-30.
Matti, J.C., Powell, R.E., Miller, F.K., Kennedy, S.A., Ruppert, K.R., Morton, G.L., and
Cossette, P.M., 1997a, Geologic-line attributes for digital geologic-map databases
produced by the Southern California Areal Mapping Project (SCAMP), Version 1.0:
U.S.Geological Survey Open-File Report 97-861
Matti, J.C., Miller, F.K., Powell, R.E., Kennedy, S.A., Bunyapanasarn, T.P., Koukladas,
Catherine, Hauser, R.M., and Cossette, P.M., 1997b, Geologic-point attributes for
digital geologic-map databases produced by the Southern California Areal Mapping Project
(SCAMP), Version 1.0: U.S.Geological Survey Open-File Report 97-859
Munsell Color, 1975, Munsell soil color charts, 1975 edition Baltimore, Maryland,
Macbeth Division of Kollmorgen Corporation.
Reynolds, M.W., Queen, J.E., and Taylor, R.B., 1995, Cartographic and digital standard
for geologic map information: U.S. Geological Survey Open-File Report 95-525
Streckeisen A., 1976, To each plutonic rock its proper name: Earth Science Reviews, v.
12, p. 1-33.
Varnes, D.J., 1978, Slope movement types and processes, in Schuster, R.L., and Krizek,
R.J., eds., Landslides: analysis and control: Washington, D.C., Transportation Research
Board, National Academy of Sciences, Special Report 176, p. 11-33.
Wentworth, C.K., 1922, A scale of grade and class terms for clastic sediments: Journal
of Geology, v. 30, p. 377-392.
Logical_Consistency_Report:
Polygon and chain-node topology present.
The areal extent of the map is represented digitally by an appropriately projected
(Polyconic projection), mathematically generated box. Consequently, polygons intersecting
the lines that comprise the map boundary are closed by that boundary. Polygons internal
to the map boundary are completely enclosed by line segments that are themselves a set of
sequentially numbered coordinate pairs. Point data are represented by coordinate pairs.
Completeness_Report:
The geologic map and digital database of the Yucaipa 7.5' quadrangle contain new data
that have been subjected to scientific peer review and are a substantially complete
representation of the current state of knowledge concerning the geology of the
quadrangle.
Information for geologic units, geologic contacts, and faults by necessity is
generalized. Although derived from data collected at individual observation stations,
the characteristics of map units, their bounding contacts, and faults have been averaged
and reduced to attributes that describe each map unit and each line element as a whole.
This averaging process is necessary because of the intrinsic variability that geologic
units, contacts, and faults display spatially: in detail, their characteristics
necessarily vary geographically, although certain core attributes persist. To account
for this variability and yet still characterize the major defining attributes of
geologic entities, the database authors have selected and archived certain geologic
characteristics but omitted others. In such cases, details were sacrificed in the
interest of defining the average character of the geologic features.
Map-unit completeness: For map-unit polygons, version 1.0 of the Yucaipa database does
not exploit the full potential afforded by the data-model and attribute scheme proposed
by Matti and others (1997a). The file yuc_geo.pat contains limited information about
polygon themes such as geologic name and the thickness of geologic-map units, as well as
information about unique attributes that distinguish a map unit within a polygon or a
particular subset of polygons. Additional lithologic-attribute data are available in
the INFO data table yuc_summ.rel, including age-related data and major rock type. Other
than this minimal information, however, the Yucaipa database for geologic-map units
(yuc_geo) lacks the comprehensive information content of the .pdf files (yuc_dmu.pdf and
yuc_cmu.pdf).
Line and Point Completeness: For line and point data, the Yucaipa database exploits the
attribution scheme proposed by Matti and others (1997a,b). This scheme allows geologic
elements represented as lines (geologic contacts, faults, fold axes, geomorphic
features) and points (bedding orientations, foliation orientations, fault dips) to be
assigned a full spectrum of attributes ranging from contact and fault type to geologic
age of linear and point features. Some of these attributes are embedded directly within
the line and point data bases (.aat and .pat, respectively). Most line and point
attributes are stored as codes in two INFO data tables (lines.rel and points.rel).
A complete description of the SCAMP polygon, line, and point data coding schemes is
available in U.S. Geological Survey Open-File Reports OF-97-859, OF-97-860, and
OF-97-861 (full source citations follow):
Matti, J.C., Powell, R.E., Miller, F.K., Kennedy, S.A., Ruppert, K.R., Morton, G.L., and
Cossette, P.M., 1997a, Geologic-line attributes for digital geologic-map databases
produced by the Southern California Areal Mapping Project (SCAMP), Version 1.0: U.S.
Geological Survey Open-File Report 97-861
http://pubs.usgs.gov/of/1997/0861/
Matti, J.C., Miller, F.K., Powell, R.E., Kennedy, S.A., Bunyapanasarn, T.P., Koukladas,
Catherine, Hauser, R.M., and Cossette, P.M., 1997b, Geologic-point attributes for
digital geologic-map databases produced by the Southern California Areal Mapping Project
(SCAMP), Version 1.0: U.S. Geological Survey Open-File Report 97-859
http://pubs.usgs.gov/of/1997/0859/
Matti, J.C., Miller, F.K., Powell, R.E., Kennedy, S.A., and Cossette, P.M., 1997c,
Geologic-polygon attributes for digital geologic-map databases produced by the Southern
California Areal Mapping Project (SCAMP), Version 1.0: U.S. Geological Survey Open-File
Report 97-860
http://pubs.usgs.gov/of/1997/0860/
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Nationwide geologic-map accuracy standards for geologic line and point features have not
been developed and adopted by the U.S. Geological Survey and other earth-science
entities. Until such standards are developed, the Southern California Areal Mapping
Project (SCAMP) uses internal map-accuracy standards for 1:24,000-scale geologic maps
produced by the project.
In the Yucaipa 1:24,000 scale quadrangle, geologic lines are judged to meet the
map-accuracy standard if they are located to within ˜+/-15 meters relative to topographic
or cultural features on the base map. Within the database, line data that are judged to
meet the map-accuracy standard are denoted in the data table lines.rel by the attribute
code .MEE. (meets); line data that may not meet the map-accuracy standard are denoted by
the attribute code .MNM. (may not meet). On geologic-map plots and other plots
generated from the geologic database, line data that are judged to meet the map-accuracy
standard are denoted by solid lines; line data that may not meet the map-accuracy
standard are denoted by dashed or dotted lines.
In the database and on geologic-map plots, no cartographic device exists for denoting
the map-accuracy for geologic-point data (symbols for bedding, foliation, lineations,
etc.).
Three sources of positional error exist for geologic elements in the Yucaipa quadrangle
database:
(1) Positional accuracy of field observations: observation stations (data localities)
were located either on aerial photographs or on the topographic basemap of the Yucaipa
quadrangle by referencing hypsographic and planimetric features on the basemap.
(2) Transfer of line and point data from aerial photographs to the topographic base:
For bedrock geologic materials, point data, contacts, and faults were visually
transferred to scale-stable copies of the topographic base map. For most surficial
geologic materials, geologic contacts and fault scarps were transferred to the base map
through the use of a PG-2 sterographic plotter that allows geologic elements to be
located with an accuracy and precision equivalent to the standard for the
topographic-contour base.
(3) Positional fidelity during digital data processing: the maximum transformation Root
Mean Square (RMS) error acceptable for 7.5' quadrangle transformation and data input is
0.003 (1.8 meters). The horizontal positional accuracy of line and point entities was
checked by visual comparison of hard-copy plots with base-stable source data.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1967, photorevised 1980
Title:
Topographic basemap of the Yucaipa quadrangle, southern
California
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 24000
Type_of_Source_Media:
Stable base material (greenline chronoflex for geologic compilation; .007 mil clearfilm
blackline for topographic basemap image)
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1967
Source_Currentness_Reference: Topographic basemap
Source_Citation_Abbreviation: USGS Yucaipa, 1967
Source_Contribution:
The Yucaipa topographic basemap served as the reference standard by which the database
authors located the position of observation stations and geologic structures (geologic
contacts, faults, fold axes). Scale-stable copies of the basemap also were used to
transfer geologic information from aerial photographs to basemap using a PG-2
stereographic plotter.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Pictorial Crafts, Inc. (contracted to the U.S. Geological Survey)
Publication_Date: 1975
Title: Pictorial Crafts aerial photography
Source_Scale_Denominator: 24000
Type_of_Source_Media: Paper true-color aerial photographs
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 197505
Ending_Date: 197506
Source_Currentness_Reference: Paper true-color aerial photographs
Source_Citation_Abbreviation: Pictorial Crafts, Inc., 1975
Source_Contribution:
The Pictorial Crafts aerial photography provides true-color rendering of geologic and
geomorphic features in the Yucaipa quadrangle and throughout the San Bernardino Basin.
The E-W flight lines were the primary aerial-photography resource used by the authors to
locate the position of observation stations and to plot the positions of geologic
structures (geologic contacts, faults, fold axes). Although their 1975 vintage post-dates
urbanization that obscures some geologic features, the photography was helpful in
recognizing geologic features whose color is a distinguishing characteristic.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
U.S. Department of Agriculture, Agricultural Stabilization and Conservation Service
Publication_Date: 1952
Title:
U.S. Department of Agriculture, Agricultural Stabilization and Conservation Service, 1952
photography (Symbol AXM, AXL)
Source_Scale_Denominator: 20000
Type_of_Source_Media: Paper black-and-white aerial photographs
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1952
Source_Currentness_Reference: 1952 date imprint on positive print
Source_Citation_Abbreviation: ASCS 1952 photography (Symbol AXM, AXL)
Source_Contribution:
The ASCS photography provides systematic aerial-photographic cover of the Yucaipa
quadrangle and the rest of the San Bernardino Basin, along N-S flight lines. This
orientation contrasts with the typical E-W orientation of most photographic series, and
provides a different perspective of geologic and geomorphic features. Because the ASCS
photography pre-dates much urbanization that obscures land-form features, it was helpful
in recognizing geologic and geomorphic features that have been obliterated by human
activities in the last 50 years or so. The database authors used the 1952 ASCS
photography to augment and refine observations made using the 1975 Pictorial Crafts
photography, and to delineate features in the Yucaipa Valley and Mentone areas.
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Department of Interior, Geological Survey
Publication_Date: 1966
Title:
U.S. Department of Interior, Geological Survey 1966 photography (symbol GS-VBNS)
Source_Scale_Denominator: 30000 (approximately)
Type_of_Source_Media: Paper black-and-white aerial photographs
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1966
Source_Currentness_Reference: 1966 date imprint on positive print
Source_Citation_Abbreviation: USGS 1966 photography (symbol GS-VBNS)
Source_Contribution:
The USGS photography (symbol GS-VBNS) provides systematic aerial photographic coverage of
the Yucaipa quadrangle and the rest of the San Bernardino Basin, along E-W flight lines.
Although their 1966 vintage post-dates some urbanization that obscures geologic features,
moderate vertical exaggeration in this photo series enhances subtle geologic and
geomorphic features not easily recognized in other photoseries. The database authors used
the 1966 GS-VBNS photography to augment and refine observations made using the 1975
Pictorial Crafts photography, and especially to delineate subtle features in the Mentone
and northern Yucaipa Valley areas.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
U.S. Department of Agriculture, Agricultural Stabilization and Conservation Service
Publication_Date: 1938
Title:
U.S. Department of Agriculture, Agricultural Stabilization and Conservation Service, 1938
photography (Symbol AXM, AXL)
Source_Scale_Denominator: 20000
Type_of_Source_Media: Paper black-and-white aerial photographs
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1938
Source_Currentness_Reference: 1938 date imprint on positive print
Source_Citation_Abbreviation: ASCS 1938 photography (Symbol AXM, AXL)
Source_Contribution:
The 1938 ASCS photography provides the most regionally extensive early-vintage aerial
images available for southern California, including the Yucaipa quadrangle. The 1938
photography pre-dates much urbanization that obscures land-form features, and thus was
helpful in recognizing geologic and geomorphic features that have been obliterated by
human activities in the last 60 years or so. The database authors used the 1938
photography to augment and refine observations made using the 1975 Pictorial Crafts
photography, and to delineate pre-urbanization features in the Yucaipa Valley and Mentone
areas.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Spence Airplane Photos, Los Angeles (flown under contract to the U.S. Geological Survey)
Publication_Date: 1930
Title: Spence aerial photography, 1930
Source_Scale_Denominator: 18000
Type_of_Source_Media: Paper black-and-white aerial photographs
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1930
Source_Currentness_Reference: 1930 date imprint on positive print
Source_Citation_Abbreviation: Spence Aerial Photography, 1930
Source_Contribution:
The Spence aerial photography consists of a single flight line flown along the San Andreas
Fault in southern California, including the Yucaipa quadrangle. The 1930 photography
pre-dates much urbanization that obscures land-form features, and thus was helpful in
delineating geologic and geomorphic features (fault scarps, shutter ridges, lineaments)
that have been obliterated by human activities in the last 70 years or so. The database
authors used the 1930 Spence photography to interpret geomorphic details of the San
Andreas Fault Zone (San Bernardino Strand).
Source_Information:
Source_Citation:
Citation_Information:
Originator: Matti, J.C.
Originator: Morton, D.M.
Originator: Cox, B.F.
Originator: Carson, S.E.
Originator: Yetter, T.J.
Publication_Date: 1992
Title: Geologic map of the Yucaipa quadrangle, southern California
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 92-445
Source_Scale_Denominator: 24000
Type_of_Source_Media: stable base material
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1930
Ending_Date: 1991
Source_Currentness_Reference:
Publication data
Time period of information content for geologic information in the 1992 Yucaipa quadrangle
map reflects (1) the vintage (1930, 1938, 1953, 1966, 1975) of archival aerial photographs
used to interpret geologic features and (2) ground observations made by the map authors
between 1977 and 1992.
Source_Citation_Abbreviation: Matti and others, 1992
Source_Contribution:
The 1992 analog geologic map of the Yucaipa quadrangle is the source of much of the
geologic line, point, and map-unit data represented in digital version 1.0. Lithologic,
structural, and stratigraphic data for sedimentary deposits of the San Timoteo beds of
Frick (1921) are retained, as are boundaries and structural orientations of crystalline
bedrock units. Most faults are the same as in the analog version,
The information content of digital version 1.0 of the Yucaipa quadrangle database differs
in some important ways from that of the analog version (Matti and others, 1992). As
described in Process_Step 4 of 6, between 1994 and 1998 one of the database authors (J.C.
Matti) reinterpreted some of the Quaternary surficial materials and some fault
relationships.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Smith, R. E.
Publication_Date: 1959
Title:
Geology of the Mill Creek area, San Bernardino County, California
Publication_Information:
Publication_Place: Los Angeles, California
Publisher: University of California
Other_Citation_Details: unpublished M.A. thesis, 95 p.
Source_Scale_Denominator: 20000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1959
Source_Currentness_Reference:
Publication data
Time period of information content for geologic information in the report by Smith (1959)
reflects the date that the thesis was approved by the thesis committee and submitted to
the University of California, Los Angeles.
Source_Citation_Abbreviation: Smith (1959)
Source_Contribution:
Smith (1959) is the source of structural-attitude data (bedding orientation) in two small
parts of the Yucaipa quadrangle: (1) in the NE 1/4 Sec. 17, T1S R1W, and (2) northwest of
Morton Peak, north and south of the boundary between Sec. 1 and 12, T1S R2W. These are
identified in the database and on the geologic-map plot.
Process_Step:
Process_Description:
Geologic mapping for analog map (Matti and others, 1992)
Geologic data for the Yucaipa quadrangle were collected in the field by the data-set
authors. The field data were plotted on aerial photographs and on a 1:24,000-scale
basemap (U.S. Geological Survey, Yucaipa 7.5' quadrangle, 1967, photorevised, 1980).
Bedrock map units were described, mapped, and interpreted on the basis of
traverse-mapping methods. Observations were recorded along each traverse, locations for
which are stored in the coverage yuc_obs. Information recorded at these stations
provides the basis for the identification and characterization of each bedrock map
unit.. Map-unit boundaries (geologic contacts) and faults identified along each
traverse typically were extended laterally by using aerial photographs and binoculars to
project or interpolate the fault or contact to its next recorded occurrence along a
nearby traverse. A few sedimentary-layering attitudes were determined through binocular
observation rather than from site determinations; these are identified in the data base
and on the geologic-map plot.
Surficial-materials map units were described, mapped, and interpreted on the basis of
aerial-photographic interpretation augmented by observations at specific stations. The
bounding contacts of each surficial unit and the location of fault scarps that traverse
the units were plotted by using a PG-2 photogrammetric plotter that allows location
accuracy equivalent to the accuracy standard for the topographic-contour base. The
coverage yuc_obs shows the position of observation stations data from which were used to
determine geologic characteristics of the surficial map units.
GEOLOGIC CONTRIBUTIONS BY AUTHORS:
Jonathan C. Matti - mapped and interpreted Quaternary surficial materials; faults of the
San Timoteo Canyon, Crafton Hills, Chicken Hill, Yucaipa Valley graben complex, and San
Andreas zones; San Timoteo Canyon formation; crystalline rocks in the Santa Ana River
Canyon and areas to the west; crystalline rocks in the southeast corner of the
quadrangle - 1979, 1985-1986, 1988, 1991.
Douglas M. Morton - mapped crystalline rocks in the Crafton Hills area - 1977.
Brett F. Cox - mapped crystalline rocks in the Crafton Hills area, in the east-central
margin of the quadrangle, and between the Wilson Creek and San Bernardino strands of the
San Andreas fault; mapped the Warm Springs Canyon formation in Mill Creek Canyon;
Quaternary materials and faults adjacent to the San Bernardino Strand between Mill Creek
and Santa Ana River - 1979 to 1980.
Scott E. Carson - mapped crystalline rocks in the vicinity of Morton Peak and Santa Ana
River Canyon; described Quaternary surficial Materials in Yucaipa Valley - 1979 through
1981.
Thomas J. Yetter - mapped crystalline rocks in the vicinity of Morton Peak and Santa Ana
River Canyon; beds of the Mill Creek Formation in lower Mill Creek Canyon - 1979.
Process_Date: 1977 through 1991
Process_Step:
Process_Description:
Analog geologic-map preparation (Matti and others, 1992)
The 1992 geologic-map product was produced from geologic linework drafted on a
1:24,000-scale greenline chronoflex of the Yucaipa 7.5' quadrangle. Source materials were
paper field sheets produced by each map author, and pencil linework generated by a PG-2
stereographic plotter on a scale-stable 1:24,000-scale chronoflex of the Yucaipa 7.5'
quadrangle.
Process_Date: 1991
Process_Step:
Process_Description:
Post-1992 revision of Yucaipa quadrangle geologic map
After the 1992 geologic map of the Yucaipa quadrangle was released (Matti and others,
1992), additional observation and interpretation by J.C. Matti led to revisions of that
version. Changes included: (1) re-interpretation of fault-line relations for the San
Bernardino Strand of the San Andreas Fault west of the mouth of Santa Ana River Canyon;
(2) re-interpretation of surficial geologic materials in the vicinity of Mentone and along
the drainage of Wildwood Canyon along its entire extent; and (3) reinterpretation of the
south end of the Chicken Hill Fault in the vicinity of Interstate Highway 10, including
the recognition of a probable fault scarp that was obliterated by construction of the
Highway right-of-way.
Process_Date: 1995-1998
Process_Step:
Process_Description:
Digital processing of Topographic Base Map
The basemap image (yuc.tif) was prepared by scanning a scale-stable right-reading,
blackline .007-mil clear-film positive of the U.S. Geological Survey, 1:24,000-scale
Yucaipa 7.5' quadrangle topographic map (1967, photorevised, 1980). Scanning was done
using an Anatech Eagle 4080 monochrome 800 dots-per-inch scanner at a resolution of 500
dpi. The raster scan was converted to a monochromatic image in ARC/INFO. No elements of
the base layer are attributed. The base map is provided for reference only.
Process_Date: 1996
Process_Step:
Process_Description:
Digital Preparation of Geologic-map Information
Geologic line and point data on scale-stable greenline chronoflex copies of the Yucaipa
7.5' quadrangle were digitized and simultaneously converted to ARC/INFO coverages
through the application and utilization of the graphical user interface ALACARTE
developed by the USGS (Fitzgibbon, 1991; Fitzgibbon and Wentworth, 1991; Wentworth and
Fitzgibbon, 1991) running on a Data General Aviion workstation. The database
subsequently was edited and tagged on a Sun SPARC20 computer system running Solaris v.
2.4 and ARC/INFO v. 7.0.4 and v. 7.1.1. Geologic point data were captured using
ALACARTE and ARC/INFO v.7.0.4.
CONTRIBUTIONS BY DATABASE EDITORS:
Pamela M. Cossette - responsible for final geologic database editing, assembling the
database and plot-file products, and production of metadata
Bradley Jones - responsible for significant data capture
Melinda C. Wright - responsible for geologic point-data capture and preliminary database
editing
Stephen A. Kennedy - responsible for initial database editing
Fitzgibbon, T.T., 1991, ALACARTE installation and system manual (version 1.0): U.S.
Geological Survey, Open-File Report 91-587B.
Fitzgibbon, T.T., and Wentworth, C.M., 1991, ALACARTE user interface - AML code and
demonstration maps (version 1.0): U.S. Geological Survey, Open-File Report 91-587A.
Wentworth, C.M., and Fitzgibbon, T.T., 1991, ALACARTE user manual (version 1.0): U. S.
Geological Survey Open-File Report 91-587C.
Process_Date: 1995-2000
Process_Step:
Process_Description:
Observation-station coverage yuc_obs
The coverage yuc_obs contains the locations of observation stations that the dataset
authors used to describe geologic materials and geologic structures in the Yucaipa
quadrangle. Several kinds of observation stations are included:
(1) Field observations made by the dataset authors. These are represented by the
author's name (e.g., Jonathan C. Matti), and the station ID (e.g., JF, which represents
J.C. Matti, notebook F);
(2) Subsurface borings obtained by the California Department of Transportation at
overpassing and underpassing right-of-ways along the Interstate and State Highway
systems;
(3) Subsurface borings obtained by the U.S. Geological Survey's Water Resources Division
(WRD);
(4) Subsurface borings obtained by various private geotechnical-engineering firms;
(5) Soil-profile descriptions obtained by the Natural Resources and Conservation Service
(Woodruff and Brock, 1980, sheet 10);
Woodruff, G.A., and Brock, W.Z., 1980, Soil survey of San Bernardino County,
southwestern part, California: U.S. Department of Agriculture, Soil Conservation
Service, 64 p., scale 1:24,000.
Process_Date: 1995-2000
Process_Step:
Process_Description:
Preliminary metadata documentation for version 1.0 of the Yucaipa quadrangle geologic
database was prepared by Pamela M. Cossette using FGDCMETA.AML ver. 1.2 05/14/98 on
ARC/INFO data set /gis_3/scamp/arccovers/sanber/yucaipa/yuc1216a. The metadata has
undergone several revisions as the Yucaipa 7.5' quadrangle data was refined.
Process_Date: 2000
Process_Step:
Process_Description: Creation of original metadata record
Process_Date: 20030827
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Pamela M. Cossette
Contact_Position: Geographer
Contact_Address:
Address_Type: mailing address
Address:
U.S. Geological Survey
Room 202
West 904 Riverside Avenue
City: Spokane
State_or_Province: Washington
Postal_Code: 99201-1087
Country: USA
Contact_Voice_Telephone: 509-368-3123
Contact_Facsimile_Telephone: 509-368-3199
Contact_Electronic_Mail_Address: pcossette@usgs.gov
