DOCSLIB.ORG

Late Cenozoic Tectonics of the Northwestern San Bernardino Mountains, Southern California

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Late Cenozoic Tectonics of the Northwestern San Bernardino Mountains, Southern California Late Cenozoic tectonics of the northwestern San Bernardino Mountains, southern California KRISTIAN E. MEISLING ARCO Oil and Gas Company, 2300 West Piano Parkway, Piano, Texas 75075 RAY J. WELDON Department of Geological Sciences, University of Oregon, Eugene, Oregon 97403 ABSTRACT which punctuated the deposition of three distinctive stratigraphic packages The late Cenozoic structural and stratigraphic history of the of Miocene, Pliocene, and Pleistocene age. Structural styles associated with northwestern San Bernardino Mountains supports two distinct epi- the uplift events suggest that regional low-angle detachments have played a sodes of uplift, in late Miocene to earliest Pliocene and Quaternary much more important role in the late Cenozoic evolution of the central time, that we hypothesize are related to movements on low-angle Transverse Ranges than is generally recognized. Our conclusions have structures beneath the range. In this paper, we document the nature, interesting structural implications for the development of the central distribution, and timing of late Cenozoic deformation and deposition Transverse Ranges province and its relationship to the evolution of the San in the northwestern San Bernardino Mountains, and we illustrate the Andreas fault in southern California. neotectonic evolution of the area in a series of interpretive paleotec- The study area includes the northern range front of the San Bernar- tonic block diagrams. dino Mountains between its junction with the San Andreas fault and In the first episode of deformation, late Miocene to earliest Plio- Lucerne Valley (Fig. 1). We present new data on the distribution, charac- cene motion on the south-southwest-directed Squaw Peak thrust sys- ter, and age of Late Cenozoic strata and structures, derived from our tem disrupted drainage in pre-existing Miocene nonmarine basins and mapping of more than 500 km2 at a scale of 1:24,000 or greater. We also uplifted the western third of the present range to form the ancestral summarize important new age control from magnetostratigraphy and mi- San Bernardino Mountains. Crystalline rocks of the San Bernardino crovertebrate paleontology that motivates significant revisions in the geo- Mountains were thrust southward across the present site of the San logic history of the area. We have reconciled these new geologic data with Andreas fault between 9.5 and 4.1 Ma, at a time when the San Gabriel previous work to establish a tectonostratigraphic framework for the late fault was the active strand of the San Andreas transform system. We Cenozoic evolution of the northwestern San Bernardino Mountains. Our speculate that the Liebre Mountain crystalline block at the northern regional synthesis should serve as a useful context for studies in progress margin of the Ridge Basin may be the missing upper plate of the and a foundation for future work aimed at resolving many remaining Squaw Peak thrust, now offset along the San Andreas fault. problems. The second episode of deformation began with uplift of the northern plateau of the modern San Bernardino Mountains on north- Setting and Previous Work directed, range-front thrusts in early Pleistocene time, between 2.0 and 1.5 Ma. Synchronous uplift of the northern plateau, recorded in The Transverse Ranges province trends obliquely across the predom- early Pleistocene fanglomerates on the northwestern margin of the inant northwesterly strike of the tectonic grain in southern California, range, is interpreted to be the result of movement of a relatively including the trace of the San Andreas fault. Many models have been coherent crustal block northward up a south-dipping detachment proposed for the structural evolution of the central Transverse Ranges ramp beneath the central range. In middle Pleistocene time, activity on province and its relation to the San Andreas fault. Although it is widely the northern range front began to wane, and the locus of uplift shifted agreed that topographic relief and thrusting in the San Bernardino Moun- to a narrow zone of arching and northward tilting adjacent to the San tains are the result of local convergence along the San Andreas fault, Andreas fault, which subsequently migrated rapidly northwestward the cause of this convergence is the subject of continued debate. Compres- along the San Andreas fault from the western San Bernardino Moun- sion in the San Bernardino Mountains has been variously attributed to tains into the northeastern San Gabriel Mountains. We attribute this (1) different movement histories on the San Andreas fault north and south pattern of deformation to the passage of a bulge or strike-slip ramp of the Transverse Ranges (Chinnery, 1965; Baird and others, 1974; Horna- attached to the southwest side of the San Andreas fault at depth. fius, 1985), (2) changes in trend of the San Andreas fault through the Transverse Ranges region (Allen, 1957, 1968; Crowell, 1981, 1982; Hill, INTRODUCTION 1982; Weldon and Humphreys, 1986), (3) clockwise rotation of the Transverse Ranges in a regional right-lateral shear couple (Garfunkel, In this paper, we document geologic constraints on the nature and 1974; Luyendyk and others, 1980,1985; Kamerling and Luyendyk, 1979, timing of late Cenozoic deformation, deposition, and uplift in the north- 1985), (4) incipient subduction of continental lithosphere (Bird and western San Bernardino Mountains, and we illustrate neotectonic Rosenstock, 1984; Sheffels and NcNutt, 1986), and (5) movement on evolution of the area in a series of interpretive paleotectonic block dia- deep-seated detachments in the crust or mantle (Hadley and Kana- grams for selected time intervals. We develop evidence for two distinct mori, 1977; Webb and Kanamori, 1985). In most models, timing of uplift uplift events, in late Miocene to earliest Pliocene and Quaternary time, in the Transverse Ranges is closely tied to timing of activity on the San Geological Society of America Bulletin, v. 101, p. 106-128, 15 figs., January 1989. 106 Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/101/1/106/3380341/i0016-7606-101-1-106.pdf by guest on 27 September 2021 117° Figure 1. Index map of the San Bernardino Mountains and their relationship to the central Transverse Ranges in southern California, showing the location of major physiographic and cultural features, as well as principal regional faults and exposures of late Cenozoic sedimentary rocks (open circle pattern). See Figure 2 for geologic map of study area. Line of seismicity cross section of Figure 9 is longitude 117°W. LV: Lucerne Valley; AV: Apple Valley; WSBA: Western San Bernardino arch; CC: Crowder Canyon; SL: Silverwood Lake; SPF: Squaw Peak fault. Downloaded from http://pubs.geoscienceworld.org/gsa/gsabulletin/article-pdf/101/1/106/3380341/i0016-7606-101-1-106.pdf by guest on 27 September 2021 108 MEISLING AND WELDON Andreas fault and convergence must be consistent in magnitude with slip ernmost part of the range in conjunction with reconnaissance studies of the on lateral faults to the north and south. San Andreas fault zone. Mapping of pre-Tertiary rocks and structures The San Bernardino Mountains are the principal topographic expres- along the northern range front substantiated the local importance of late sion of the Transverse Ranges province east of the San Andreas fault Cenozoic deformation (Woodford and Harriss, 1928; Gillou, 1953; Rich- (Fig. 1). The northern San Bernardino Mountains are capped by a broad mond, 1960; MacColl, 1964). Allen (1957) and Shreve (1959) showed plateau of mature geomorphic landforms that stands 2 km above sea level, that a useful late Tertiary and Quaternary stratigraphy existed along the and 1 km above the floor of the Mojave Desert to the north. A narrow margins of the range with which to develop a detailed history of uplift and western extension of the range links the San Bernardino Mountains with deformation. Geologic quadrangle mapping at 1:62,000 by Dibblee the San Gabriel Mountains across the trace of the San Andreas fault. The (1964a, 1964b, 1965a, 1965b, 1967,1974) established a regional basis for southern San Bernardino Mountains are underlain by the San Gorgonio future studies and revealed the importance of late Quaternary uplift in the massif, which includes some of the highest peaks in southern California western range (Dibblee, 1975a). Late Cenozoic sedimentary rocks in the that stand more than a kilometer above the northern plateau and 2 km Cajon Pass area were described and mapped in detail by Yerkes (1951), above San Gorgonio Pass to the south. All along the margins of the central Woodburne and Golz (1972), Morton and Miller (1975), and Foster and western range, steep canyons contrast sharply with the reduced mature (1980, 1982). Detailed studies by Sadler (1981), Weldon and others landforms of the flat range crest, underscoring both the recency of uplift (1981), Meisling (1984), Weldon (1986), and Miller (1987) contributed and the vigorous activity of structures marginal to the range. Existing neotectonic mapping at 1:24,000 along the northwestern front of the San tectonic models do not satisfactorily address the manner in which conver- Bernardino Mountains. Shreve (1968), Sadler (1982b, 1985), and Strat- gence along the San Andreas fault is translated into uplift in the central house (1983) described late Cenozoic deposits in the northern and central Transverse Ranges, nor do they adequately address the timing of this uplift part of the range. Late Cenozoic age control was established by microver-
Load more

Recommended publications
  • San Bernardino County, California
    DEPARTMENT OF THE INTERIOR TO ACCOMPAN~ MAP MF-1493-A UNITED STATES GEOLOGICAL SURVEY IIINE1lAL RESOURCE POTBM"nAL OP THE BIGHORN MOUNTAINS WU.DERNJmS STUDY AREA (CDCA-217), SAN BERNARDINO COUNTY, CALIFORNIA SUMMARY REPORT By Miathan C. Matti, Brett P. Cox, Ecblrdo A. Rodriguez, CUrtis M. Obi, Robert E. Powell, Margaret E. Hinkle, and Andrew Griscom U.S. Geological Survey and Charles Sabine and Gary J. Cwick U.S. Bureau of Mines STUDIES RELATED TO WU.DERNESS Bureau of Land Management Wilderness Study Areas The Federal Land Policy and Management Act (Public Law 94-579, October 21, 1976) requires the U.S. Geological Survey and the U.S. Bureau of Mines to conduct mineral surveys in certain areas to determine their mineral resource potential. Results must be made available to the public and be submitted to the President and the Congress. This report presents the results of a mineral survey of the Bighorn Mountains Wilderness Study Area (CDCA-217), California Desert Conservation Area, San Bernardino County, California. SUMMARY Geological, geochemical, and geophysical evidence, together with a review of historical mining and prospecting activities, suggests that most of the Bighorn Mountains Wilderness Study Area has low potential for the discovery of all types of mineral and energy resources-including precious and base metals, building stone and aggregate, fossil fuels, radioactive-mineral resources, . and geothermal resources. Low-grade mineralization has been documented in one small area near Rattlesnake Canyon, and this area has low to moderate potential for future small-scale exploration and development of precious and base metals. Thorium and uranium enrichment have been documented in two small areas in the eastern part of the wilderness study area; these two areas have low to moderate potential for future small-scale exploration and development of radioactive-mineral resources.
    [Show full text]
  • UNIVERSITY of CALIFORNIA Los Angeles Southern California
    UNIVERSITY OF CALIFORNIA Los Angeles Southern California Climate and Vegetation Over the Past 125,000 Years from Lake Sequences in the San Bernardino Mountains A dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy in Geography by Katherine Colby Glover 2016 © Copyright by Katherine Colby Glover 2016 ABSTRACT OF THE DISSERTATION Southern California Climate and Vegetation Over the Past 125,000 Years from Lake Sequences in the San Bernardino Mountains by Katherine Colby Glover Doctor of Philosophy in Geography University of California, Los Angeles, 2016 Professor Glen Michael MacDonald, Chair Long sediment records from offshore and terrestrial basins in California show a history of vegetation and climatic change since the last interglacial (130,000 years BP). Vegetation sensitive to temperature and hydroclimatic change tended to be basin-specific, though the expansion of shrubs and herbs universally signalled arid conditions, and landscpe conversion to steppe. Multi-proxy analyses were conducted on two cores from the Big Bear Valley in the San Bernardino Mountains to reconstruct a 125,000-year history for alpine southern California, at the transition between mediterranean alpine forest and Mojave desert. Age control was based upon radiocarbon and luminescence dating. Loss-on-ignition, magnetic susceptibility, grain size, x-ray fluorescence, pollen, biogenic silica, and charcoal analyses showed that the paleoclimate of the San Bernardino Mountains was highly subject to globally pervasive forcing mechanisms that register in northern hemispheric oceans. Primary productivity in Baldwin Lake during most of its ii history showed a strong correlation to historic fluctuations in local summer solar radiation values.
    [Show full text]
  • III. General Description of Environmental Setting Acres, Or Approximately 19 Percent of the City’S Area
    III. GENERAL DESCRIPTION OF ENVIRONMENTAL SETTING A. Overview of Environmental Setting Section 15130 of the State CEQA Guidelines requires an EIR to include a discussion of the cumulative impacts of a proposed project when the incremental effects of a project are cumulatively considerable. Cumulative impacts are defined as impacts that result from the combination of the proposed project evaluated in the EIR combined with other projects causing related impacts. Cumulatively considerable means that the incremental effects of an individual project are considerable when viewed in connection with the effects of past projects, the effects of other current projects, and the effects of probable future projects. Section 15125 (c) of the State CEQA Guidelines requires an EIR to include a discussion on the regional setting that the project site is located within. Detailed environmental setting descriptions are contained in each respective section, as presented in Chapter IV of this Draft EIR. B. Project Location The City of Ontario (City) is in the southwestern corner of San Bernardino County and is surrounded by the Cities of Chino and Montclair, and unincorporated areas of San Bernardino County to the west; the Cities of Upland and Rancho Cucamonga to the north; the City of Fontana and unincorporated land in San Bernardino County to the east; the Cities of Eastvale and Jurupa Valley to the east and south. The City is in the central part of the Upper Santa Ana River Valley. This portion of the valley is bounded by the San Gabriel Mountains to the north; the Chino Hills, Puente Hills, and San Jose Hills to the west; the Santa Ana River to the south; and Lytle Creek Wash on the east.
    [Show full text]
  • Cultural Resources Report
    HISTORICAL/ARCHAEOLOGICAL RESOURCES SURVEY REPORT MCDONALD LEARNING CENTER EAST PROJECT Big Bear City Area San Bernardino County, California For Submittal to: County of San Bernardino 385 North Arrowhead Avenue San Bernardino, CA 92415 Prepared for: McDonald Learning Center P.O. Box 150 Big Bear Lake, CA 92315 Prepared by: CRM TECH 1016 East Cooley Drive, Suite A/B Colton, CA 92324 Bai “Tom” Tang, Principal Investigator Michael Hogan, Principal Investigator April 23, 2019 CRM TECH Contract No. 3458 Title: Historical/Archaeological Resources Survey Report: McDonald Learning Center East Project, Big Bear City Area, San Bernardino County, California Author(s): Bai “Tom” Tang, Principal Investigator/Historian Ben Kerridge, Archaeologist/Report Writer Daniel Ballester, Archaeologist/Field Director Nina Gallardo, Archaeologist/Native American Liaison Consulting Firm: CRM TECH 1016 East Cooley Drive, Suite A/B Colton, CA 92324 (909) 824-6400 Date: April 23, 2019 For Submittal to: County of San Bernardino 385 North Arrowhead Avenue San Bernardino, CA 92415 (909) 387-8311 Prepared for: Lisa Burtner McDonald Learning Center P.O. Box 150 Big Bear Lake, CA 92315 (909) 709-4041 USGS Quadrangle: Moonridge, Calif., 7.5’ quadrangle (Section 19, T2N R2E, San Bernardino Baseline and Meridian) Project Size: Approximately 0.75 acre Keywords: Big Bear Valley, San Bernardino Mountains; Phase I historical/ archaeological resources survey; a portion of Assessor’s Parcel Number 0315-421-02; no “historical resources” found MANAGEMENT SUMMARY In March and April 2019, CRM TECH performed a cultural resources study on approximately 0.75 acre of undeveloped land in the San Bernardino Mountains and to the southeast of the unincorporated community of Big Bear City, San Bernardino County, California.
    [Show full text]
  • 5. Environmental Analysis
    5. Environmental Analysis 5. ENVIRONMENTAL ANALYSIS 5.1 AESTHETICS Characterizing aesthetics and aesthetic impacts is highly subjective by nature. Aesthetics, as evaluated in this Section of the EIR, involves establishing the existing visual character including visual resources and scenic vistas unique to the City of San Bernardino, the SOI and the Arrowhead Springs area. Visual resources are determined by identifying existing landforms, natural features or urban characteristics; views of sensitive receptors (i.e., residential, schools, recreation areas, etc.); and existing light and glare (i.e., nighttime illumination). The aesthetic impacts of the proposed project are evaluated by determining the aesthetic compatibility of the proposed project with the surrounding area taking into consideration the visual qualities as well as the sensitivity of receptors to these features. 5.1.1 Environmental Setting 5.1.1.1 San Bernardino General Plan Update Visual Character The City of San Bernardino lies on a broad, gently sloping lowland that flanks the southwest margin of the San Bernardino Mountains. The lowland is underlain by alluvial sediments eroded from bedrock in the adjacent mountains and washed by rivers and creeks into the valley region where they have accumulated in layers of gravel, sand, silt and clay. This low lying valley is framed by the San Bernardino Mountains on the northeast and east, Blue Mountains and Box Springs Mountain abutting the Cities of Loma Linda and Redlands to the south, and the San Gabriel Mountains and the Jurupa Hills to the northwest and southwest, respectively. The Santa Ana River has a number of tributaries in the vicinity of San Bernardino that contribute flow to the main stem of the river including Lytle Creek, Cajon Creek, Warm Creek, East Creek and West Twin Creek (see Figure 3.1-2).
    [Show full text]
  • Adjudicated Newspapers
    Newspapers of General Circulation ~ Superior Court of San Bernardino County Name: City News Name: Adelanto Bulletin Name: Apple Valley News Address: 3200 E Guasti Road Ste 100 Address: PO Box 673 Address: PO Box 1147 City: Ontario, CA 91761 City: Adelanto, CA 92301 City: Apple Valley, CA 92307 Phone #: (909) 987-6397 Phone #: (760) 246-6822 Phone #: (760) 242-1930 Fax #: (909) 989-0425 Fax #: (760) 244-6609 Fax #: (760) 244-6609 E-Mail: [email protected] E-Mail: [email protected] E-Mail: [email protected] Case No. SCV-87903 Case No. VCV-006222 Case No. VCV-0011254 Date of Court Order 01-31-57 Date of Court Order 07-11-95 Date of Court Order 01-13-97 Day Published: Saturday Day Published: Thursday Day Published: Friday Area of Circulation: La Verne, Rancho Cucamonga, San Area of Circulation: City of Adelanto Area of Circulation: Apple Valley & Victor Valley Dimas, and Upland Name: Colton City News Name: The Alpine Mountaineer Name: Big Bear Grizzly Address: 22797 Barton Road Address: PO Box 4572 Address: 42007 Fox Farm Road, Suite 3B City: Grand Terrace, CA 92313 City: Crestline, CA 92325 PO Box 1789 Phone #: (909) 370-1200 Phone #: (909) 589-2140 City: Big Bear Lake, CA 92315 Fax #: (909) 825-1116 Fax #: Phone #: (909) 866-3456 E-Mail: [email protected] E-Mail: [email protected] Fax #: (909) 866-2302 Case No. SCV-13352 Case No. SCV-232612 E-Mail: [email protected] Date of Court Order December 20, 1994 Date of Court Order 09-25-86, Modified Case No. SCV-102161 Day Published:
    [Show full text]
  • City of Banning Comprehensive General Plan/Draft EIR Section II – Regional Environmental Setting
    TN/City of Banning Comprehensive General Plan/Draft EIR Section II – Regional Environmental Setting CITY OF BANNING COMPREHENSIVE GENERAL PLAN DRAFT ENVIRONMENTAL IMPACT REPORT SECTION II. REGIONAL ENVIRONMENTAL SETTING Introduction This section of the EIR provides a general introduction to the environmental setting of the Banning Pass area, of which the City of Banning is at the center. Discussions are based on a regional perspective to provide a broad and comprehensive understanding of the issues associated with implementation of the proposed General Plan. Topics discussed include existing and surrounding land use patterns in Banning and the vicinity, regional climate, topography, soils and geology, and biological resources. Also addressed are air quality issues, cultural resources, traffic and circulation, visual resources, and public services and facilities. The City of Banning conducted an Initial Study in accordance with Section 15063, 15064, and 15065 of the California Environmental Quality Act (CEQA) Guidelines (see Appendix A). Issues identified as potentially significant in the Initial Study are analyzed in detail in Section III of this document. A Notice of Preparation (NOP) for this EIR was transmitted on January 7, 2005 and comments received are included in Appendix A of this document. The General Plan study area encompasses a total of approximately 23.2± square miles of incorporated City lands, including about 8.5± square miles of Sphere-of-Influence lands, and about 5.2± square miles outside the SOI and the City but within the General Plan study area. A. Existing Land Use Development in the City of Banning is focused primarily on the valley floor along U.S.
    [Show full text]
  • Geologic Map of the Devore 7.5' Quadrangle, San Bernardino County , California
    Geologic map of the Devore 7.5’ quadrangle, San Bernardino County , California 1 2 By D.M. Morton and J.C. Matti Digital preparation by G. Morton1, C. Koukladas1, and P.M. Cossette3 Prepared in cooperation with CALIFORNIA DIVISION OF MINES AND GEOLOGY Open-File Report OF 01-173 2001 Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U. S. Government. This database, identified as "Geologic map of the Devore 7.5’ quadrangle, San Bernardino County, California " has been approved for release and publication by the Director of the USGS. U. S. DEPARTMENT OF THE INTERIOR U. S. GEOLOGICAL SURVEY 1Western Earth Surface Processes Team, U.S. Geological Survey University of California, Riverside, CA 92521 2 Western Earth Surface Processes Team, U.S. Geological Survey 920 North Park Avenue, Tucson, AZ 85719-5035 3U.S. Geological Survey 904 West Riverside Avenue, Spokane, WA 99201 TABLE OF CONTENTS Introduction General How to obtain paper plots Database contents Data package Plot package Other files Software utilities How to obtain the digital files How to extract the geologic map database from the tar file Digital database PostScript plot files Portable Document Format (.pdf) files How to convert the ARC/INFO interchange (export) files Digital geologic map specifications Digital and geologic compilation of geologic map Base map Spatial resolution Map accuracy standards Database specifics General Lines Polygons Points References Appendix I INTRODUCTION General Open-File Report OF 01-173 contains a digital geologic map database of the Devore 7.5’ quadrangle, San Bernardino County, California that includes: 1.
    [Show full text]
  • Air Pollution Increases Forest Susceptibility to Wildfires: a Case Study for the San Bernardino Mountains in Southern California
    Previous Advances in Threat Assessment and Their Application to Forest and Rangeland Management Air Pollution Increases Forest Susceptibility to Wildfires: A Case Study for the San Bernardino Mountains in Southern California N.E. Grulke, R.A. Minnich, T. Paine, and P. Riggan in root mass significantly increase tree susceptibility to drought stress, and when additionally combined with N.E. Grulke, research plant physiologist, USDA Forest increased bole carbohydrates, perhaps all contribute to Service, Pacific Southwest Research Station, Riverside, CA success of bark beetle attack. Phenomenological and 92507; T. Paine, professor, Department of Entomology, experimental evidence is presented to support the role of and R.A. Minnich, professor, Department of Geography, these factors contributing to the susceptibility of forests to University of California, Riverside, CA 92521; and P. Rig- wildfire in southern California. gan, research soil scientist, USDA Forest Service, Pacific Keywords: Bark beetle, fire suppression, forest densifi- Southwest Research Station, Riverside, CA 92507. cation, N deposition, O3 exposure. Abstract Introduction Many factors increase susceptibility of forests to wildfire. Many factors combine to increase forest susceptibility to Among them are increases in human population, changes wildfire in southern California, and most of these were in land use, fire suppression, and frequent droughts. These set in motion decades ago. These factors include a rapid factors have been exacerbating forest susceptibility to increase in human population and resource use; a shift wildfires over the last century in southern California. Here from timber production to recreational forest use; fire we report on the significant role that air pollution has on suppression with subsequent forest densification; periodic, increasing forest susceptibility to wildfires, as unfolded extreme drought; and bark beetle outbreaks.
    [Show full text]
  • APPENDIX a Revised Cultural Resources Technical Report
    APPENDIX A Revised Cultural Resources Technical Report CULTURAL RESOURCES TECHNICAL REPORT for the ETIWANDA HEIGHTS NEIGHBORHOOD AND CONSERVATION PLAN CITY OF RANCHO CUCAMONGA, CALIFORNIA Prepared for: Sargent Town Planning 706 South Hill Street, 11th Floor Los Angeles, CA 90014 Contact: David Sargent Prepared by: Adriane Dorrler, BA, Micah Hale, PhD, RPA, Kate Kaiser, MSHP, Linda Kry, BA, and Rachel Hoerman, PhD, RPA 38 N. Marengo Avenue Pasadena, CA 91101 JUNE 2019 Printed on 30% post-consumer recycled material. Cultural Resources Technical Report for the Etiwanda Heights Neighborhood and Conservation Plan, Rancho Cucamonga, California NATIONAL ARCHAEOLOGICAL DATABASE (NADB) INFORMATION Authors: Adriane Dorrler, BA, Micah Hale, PhD, RPA, and Kate Kaiser, MSHP Firm: Dudek Project Proponent: Sargent Town Planning 706 South Hill Street, 11th Floor Los Angeles, CA 90014 Contact: David Sargent Report Date: June 2019 Report Title: Cultural Resources Technical Report for the Etiwanda Heights Neighborhood and Conservation Plan, Rancho Cucamonga, California Type of Study: Cultural Resources Inventory and Significance Evaluation New Sites: Temporary Designations: 9020-AD-02, 9020-AV-01, 9020-BC-01, 9020- ISO-PH-01, 9020-ISO-AD-01, 9020-ISO-KS-01 Updated Sites: None USGS Quads: Rancho Cucamonga Peak, Mount Baldy, Devore, CA 1:24,000; T 1N / R 6W, 7W Acreage: Approximately 4,388 acres Keywords: survey, intensive, positive results, evaluation, historic refuse scatter, bedrock milling station, 4,388 acres, City of Rancho Cucamonga 9020 i January 2019 Cultural Resources Technical Report for the Etiwanda Heights Neighborhood and Conservation Plan, Rancho Cucamonga, California INTENTIONALLY LEFT BLANK 9020 ii January 2019 Cultural Resources Technical Report for the Etiwanda Heights Neighborhood and Conservation Plan Rancho Cucamonga, California TABLE OF CONTENTS Section Page No.
    [Show full text]
  • Recommended Critical Biological Zones in Southern California's
    1 Recommended Critical Biological Zones in Southern California’s Four National Forests: Los Padres · Angeles · San Bernardino · Cleveland Lake Fulmor, San Jacinto Mountains, San Bernardino National Forest. Photo by Monica Bond Monica Bond Curt Bradley 2 Table of Contents Executive Summary . 3 Introduction and Methods . 5 Los Padres National Forest . 6 Angeles National Forest . 10 San Bernardino National Forest . 15 Cleveland National Forest . 20 Literature Cited . 23 Map of Recommended CBZs . 24 We thank the following highly knowledgeable scientists for their input: • Chris Brown – U.S. Geological Survey, Western Ecological Research Center, San Diego • David Goodward – San Bernardino Valley Audubon Society • Frank Hovore – Frank Hovore and Associates, Santa Clarita • Timothy Krantz – University of Redlands and San Bernardino Valley Audubon Society • Fred Roberts – California Native Plant Society • Sam Sweet – Department of Ecology, Evolution and Marine Biology, U.C. Santa Barbara • Michael Wangler – Department of Science and Engineering, Cuyamaca College 3 Executive Summary With majestic mountains, dramatic coastlines, and a remarkable diversity of wildlands from alpine forests to desert scrublands, Southern California’s four national forests – Los Padres, Angeles, San Bernardino, and Cleveland – are beloved by millions of backpackers, hikers, birdwatchers, hunters and fisherman, and outdoor enthusiasts. Scientists recognize our region as one of the richest areas of plant and animal life on the planet. It is home to roughly 3,000 plant and 500 animal species, many of which are found nowhere else on Earth. Our national forests form the backbone for the conservation of the natural beauty and extraordinary biological diversity of the region. One of the great pleasures of hiking in the forests is to see this diversity, from rare butterflies, fish, frogs, and birds to mule deer, bighorn sheep, and bobcats.
    [Show full text]
  • Physical Setting
    Physical Setting Dunne and Leopold (1978) define a watershed as an area of land that drains water, sediment, and dissolved materials to a common outlet at some point along a stream channel. The Santa Ana River (SAR) Watershed, depicted in Figure 3-1, drains a 2,650 square-mile area. The watershed is home to over 6 million people and includes the major population centers of parts of Orange, Riverside, and San Bernardino Counties, as well as a sliver of Los Angeles County. The Santa Ana River flows over 100 miles and drains the largest coastal stream system in Southern California. It discharges into the Pacific Ocean at the City of Huntington Beach. The total length of the SAR and its major tributaries is about 700 miles. 1 | W a t e r s h e d S e t t i n g Figure 3-1 Santa Ana Integrated Regional Water Management Region The watershed boundaries nearly match the boundaries of the Santa Ana Regional Water Quality Control Board, an organization with whom the Santa Ana Watershed Project Authority (SAWPA) has worked closely with for many years. In addition, its boundaries match the Integrated Regional Water Management (IRWM) region and the recognized Santa Ana Funding Area, as defined by the Proposition 84 IRWM program. Although there are many sub-watershed planning efforts, One Water One Watershed 2.0 (OWOW) attempts to bring all these efforts, as well as all different jurisdictions in the watershed, into a single watershed-wide vision. Over the years, SAWPA has participated in the development of sub-regional IRWM plans, with the understanding that such plans would be complementary to OWOW.
    [Show full text]