Pamphlet to Accompany Scientific Investigations Map 3107
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Surficial Geologic Map of the Cuddeback Lake 30' x 60' Quadrangle, San Bernardino and Kern Counties, California By Lee Amoroso and David M. Miller View northwest from the Rand Mountains, of Koehn (dry) Lake, the El Paso Mountains, and the southern Sierra Nevada. Pamphlet to accompany Scientific Investigations Map 3107 2012 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Marcia K. McNutt, Director U.S. Geological Survey, Reston, Virginia: 2012 For product and ordering information: World Wide Web: http://www.usgs.gov/pubprod Telephone: 1-888-ASK-USGS For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment: World Wide Web: http://www.usgs.gov Telephone: 1-888-ASK-USGS Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted material contained within this report. ii Contents Abstract ............................................................................................................................................................................................1 Introduction ......................................................................................................................................................................................1 Geologic Setting ...........................................................................................................................................................................2 Previous Work ..............................................................................................................................................................................3 Mapping Methods .........................................................................................................................................................................4 Explanation of Unit Labels............................................................................................................................................................4 Composite Unit Labels .............................................................................................................................................................4 Conventions for Erosional Environments .................................................................................................................................5 Neotectonics ....................................................................................................................................................................................5 Blackwater Fault ...........................................................................................................................................................................5 Cantil Valley Fault ........................................................................................................................................................................6 El Paso Fault ................................................................................................................................................................................6 Garlock Fault ................................................................................................................................................................................6 Grass Valley Fault ........................................................................................................................................................................8 Harper Fault Zone ........................................................................................................................................................................8 Cuddeback Fault ......................................................................................................................................................................9 Gravel Hills Fault ......................................................................................................................................................................9 Harper Valley Fault ..................................................................................................................................................................9 Black Mountain Fault ................................................................................................................................................................9 Harper Lake Fault ....................................................................................................................................................................9 Lockhart Fault Zone .....................................................................................................................................................................9 Lockhart Fault ........................................................................................................................................................................10 South Lockhart Fault ..............................................................................................................................................................11 North Lockhart Fault ...............................................................................................................................................................11 Muroc Fault ................................................................................................................................................................................11 Rand Mountains Fault Zone .......................................................................................................................................................11 Geomorphology ..............................................................................................................................................................................12 Late Tertiary to Early Quaternary Alluvium and Its Relation to Paleodrainages .........................................................................12 Pediments and Pediment Formation ..........................................................................................................................................14 Development and Age of Pediment Veneers .........................................................................................................................15 Acknowledgments ..........................................................................................................................................................................18 Description of Map Units ................................................................................................................................................................19 Depositional Landscape .............................................................................................................................................................19 Anthropogenic Deposits .........................................................................................................................................................19 Valley-Axis Deposits ..............................................................................................................................................................19 Wash Deposits .......................................................................................................................................................................19 Alluvial and Debris-Flow Deposits ..........................................................................................................................................20 Eolian Deposits ......................................................................................................................................................................24 Mixed Alluvial and Eolian Deposits ........................................................................................................................................24 Playa Deposits .......................................................................................................................................................................25 Lacustrine Deposits ................................................................................................................................................................25 Groundwater-Discharge Deposits ..........................................................................................................................................26 iii Erosional Landscape ..................................................................................................................................................................26 Colluvial and Landslide Deposits ...........................................................................................................................................26 Hillslope Deposits ...................................................................................................................................................................27 Pediment Surfaces .................................................................................................................................................................27