Basement rocks of San Bernardino Mountains-type

Basement rocks of Peninsular Ranges-type

Basement rocks of San GabrielMountains-type (upper plate of Vincent Thrust)

Basement rocks of San Gabriel Mountains-type (Pelona Schist in lower plate of Vincent Thrust)

Map showing location of El Casco 7.5’ quadrangle relative to faults and basement-rock terranes in the region. Faults in red are modern strands of the San Andreas and San Jacinto faults; progressively older strands of the San Andreas Fault include the Mill

Creek strand (orange), Mission Creek strand (green), and Wilson Creek strand (light blue). Dark blue indicates the late Miocene Banning Fault. Paired arrows indicate movement direction on strike-slip faults; bar-and-ball symbol

indicates down-thrown block of normal fault. Modified from Matti and others (1992) and Matti and Morton (1993). BPF, Beaumont Plain Fault zone; CHH, Crafton Hills horst-and-graben

complex; GHF, Glen Helen Fault; ICF, Icehouse Canyon Fault; MVF, Morongo Valley Fault; SCF, San Antonio Canyon Fault;

SGPF, San Gorgonio Pass Fault zone; VT, Vincent Thrust.

117° 07' 30"

33° 52' 30"117° 07' 30"

1 0 1 MILE12

1 KILOMETER0.51

CONTOUR INTERVAL 40 FEET

SCALE 1:24,000

33° 52' 30"117° 00' 00"

34° 00' 00"117° 00' 00"

CALIF

AREA OF MAP

34° 00' 00"

Geologic and Geophysical Maps of the El Casco 7.5’ Quadrangle, Riverside County, California, with

Accompanying Geologic-map Database

Map Showing Observation StationsShowing data points (outcrop stations, boring locations, seismic lines, and

trench excavations) used to describe map units and geologic structures

Digital Database

Geologic features located with an accuracy and precision of ±15 m meet the geologic-map accuracy standardGeology of urbanized areas mapped from 1938- and 1952-vintage aerial photographs; in some places, human modifications obscure depicted geologyGeology mapped by J.C. Matti, 1973-1974, 1979, 1996, 2006; D.M. Morton, 1974, 2004, 2009.CDigital preparation by P.M. Cossette, 2003; J.G. Matti, 2003, 2005; D.M. Hirschberg, 2008, 2009, 2013Edited by Theresa IkiManuscript approved for publication November 5, 2010

Base from U.S. Geological Survey, El Casco, 1967Universal Transverse Mercator projection. NAD 27

Prepared in Cooperation withSan Gorgonio Pass Water Agency and

California Geological Survey

U.S. Department of the InteriorU.S. Geological Survey

Open-File Report 2010–1274Sheet 2 of 3

Pamphlet accompanies map

By

Jonathan C. Matti1 and Douglas M. Hirschberg1

By

Douglas M. Hirschberg,1 Jordan G. Matti,2 and Pamela M. Cossette31U.S. Geological Survey Tucson, Arizona2University of Arizona Tucson, Arizona3U.S. Geological Survey Spokane, Washington

Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government

This map was printed on an electronic plotter directly from digital files. Dimensional calibration may vary between electronic plotters and between X and Y directions on the same plotter, and paper may change size due to atmospheric conditions; therefore, scale and proportions may not be true on plots of this map.

Digital files available at http://dx.doi.org/10.3133/ofr20101274

Suggested Citation: Matti, J.C, Morton, D.M., and Langenheim, V.E., 2015, Geologic and geophysical maps of the El Casco 7.5’ quadrangle, Riverside County, southern California: U.S. Geological Survey Open-File Report 2010–1274, pamphlet 141 p., 3 sheets, scale 1:24,000, http://dx.doi.org/10.3133/ofr20101274.

This map plot indicates the position of various kinds of geologic and geophysical information used to generate the El Casco geologic map. The plot (sheet 2 of 3) should be used in conjunction with the geologic map (sheet 1 of 3) and the gravity map (sheet 3 of 3) to identify where observations were made by the map authors and by other investigators.The observation stations depicted on this plot are a measure of data density within the map footprint. Geologic map units and geologic structures are extended throughout the map by an extrapolation process whose reliability depends on the number and quality of observation stations: the greater the number of stations, the greater the confidence that a given map unit or geologic structure is identified correctly and located accurately. The purpose of sheet 2 of 3 is to provide the map user with a sense of where and what kind of data observations were used by the authors to generate the geologic map of the El Casco quadrangle.Sheet 2 of 3 was generated from the digital files “elcs_obs_points” and “elcs_obs_lines” that are part of the El Casco digital database. Data fields in this file record several kinds of information, including (1) data source (map authors, other investigators), (2) data type (for example, outcrop observations, subsurface borings, seismic lines, excavations, soil-profile descriptions, gravity measurements), and (3) station identification for many (but not all) of the stations depicted on sheet 2 of 3.

REFERENCES CITED

California Department of Water Resources, 1999, Geologic report, East Branch extension—Phase 1: Reach 3 Pipeline, Garden Air Creek to Noble Creek: State Water Facilities, Santa Ana Division, Project Geology Report D-154, December, 1999, 17 p., 4 pl.

CHJ, Inc., 1988, Geotechnical evaluation of younger alluvium (Qal), Oak Valley Project, Riverside County, California, Job No. 88585-3: unpublished consulting report on file with Riverside County Planning Department.

CHJ, Inc, 2004, Subsurface investigation of faulting, tentative Tract No. 30545 east of Singleton Road and Calimesa Boulevard, Calimesa, California: unpublished consulting report on file with Riverside County Planning Department, 29 p.

Knecht, A.A., 1971, Soil survey of western Riverside County area, California: U.S. Department of Agriculture, Soil Conservation Service, 157 p., 214 pl., scale 1:24,000.

Matti, J.C., and Morton, D.M., 1993, Paleogeographic evolution of the San Andreas fault in southern California: a reconstruction based on a new cross-fault correlation, in Powell, R.E., Weldon, R.J., and Matti, J.C., eds., The San Andreas fault system: displacement, palinspastic reconstruction, and geologic evolution: Geological Society of America Memoir 178, p. 107-159.

Matti, J.C., Morton, D.M. and Cox, B.F., 1992, The San Andreas Fault system in the vicinity of the central Transverse Ranges province, southern California: U.S. Geological Survey Open-File Report 92-354, 40 p., scale 1:250,000.

Park, S.K., Pendergraft, D., Stephenson, W.J., Shedlock, K.M., and Lee, T-C., 1995, Delineation of intrabasin structure in a dilational jog of the San Jacinto fault zone, southern California: Journal of Geophysical Research, v. 100, no. B1, p. 691-702.

Petra Consultants, 2004, Fault investigation, Oak Valley at Calimesa, Riverside County, California: unpublished consulting report on file with Riverside County Planning Department, 16 p, many appendices and map plates.

Rasmussen, G.S., and Associates, 1988a, Engineering geology investigation tentative Tract 9209, Lots 1-337, San Bernardino County, California: unpublished consulting report on file with Riverside County Planning Department, 29 p.

Rasmussen, G.S., and Associates, 1988b, Preliminary engineering geology investigation, Oak Valley Project, 6725 acres southwest of Interstate 10, northern Riverside County, California: Project No. 2529.1, August 9, 1988: unpublished consulting report on file with Riverside County Planning Department, 36 p. with many figures.

Rewis, D.L. Christensen, A.H., Matti, J.C., Hevesi, J.A., Nishikawa, T., and Martin, P.M., 2006, Geology, ground-water hydrology, geochemistry, and ground-water simulation of the Beaumont and Banning storage units, San Gorgonio Pass area, Riverside County, California: U.S. Geological Survey Scientific Investigations Report 2006-5026, 173 p.

Shuler, E.H., 1953, Geology of a portion of the San Timoteo Badlands near Beaumont, California: Los Angeles, University of Southern California, unpublished M.S. Thesis, 106 p., scale 1:48,000.

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Subsurface boring

California Department of Transportation

California Department of Water Resources geotechnical investigation (California Department of Water Resources, 1999)

Water-well boring location (Rewis and others, 2006)

Deep-subsurface boring—Showing station identification from Shuler (1953), with total depth and, in some instances, depth-to-basement

Pedogenic-soil description—Showing station identification from Knecht (1971)

Trench (CHJ, Inc., 1988, 2004; Rasmussen and Associates, 1988a, b; Petra Consultants, 2004)

Line of seismic transect (Park and others, 1995)

Pipeline geotechnical investigation (California Department of Water Resources, 1999)

EXPLANATION OF MAP SYMBOLS

CDWR 1999

NRCS-WRC-27

SJ3

Moreno Oil Company

2015