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USGS Miscellaneous Field Studies MF-2373, Explanation

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USGS Miscellaneous Field Studies MF-2373, Explanation MISCELLANEOUS FIELD STUDIES MAP MF–2373 U.S. DEPARTMENT OF THE INTERIOR Sheet 6 of 8 U.S. GEOLOGICAL SURVEY Pamphlet accompanies map CORRELATION OF MAP UNITS Sierra Azul Block and related rocks in Santa Teresa Hills 20 Strike and dip of volcanic flow or of dikes and sills 1 Ball denotes that facing direction of flow is known QUATERNARY TO LATE TERTIARY UNITS Tme Shale and sandstone of Highland Way (lower Miocene to lower Eocene) MILPITAS CALAVERAS MT. DAY EYLAR MTN. MT. COPPER MTN. PATTERSON CROWS from sedimentary or volcanic structures RES. BOARDMAN LANDING 10 md gp pp af Sandstone and shale of Loma Chiquita Ridge (Eocene)Consists of: Inclined Figure 2B. References to sources of data used in compilation (see fig. 2A). Vertical Holocene Tlm Siliceous mudstone 1. Clark, J.C., field work, 1961. Qhf 2. Dibblee, T.W., Jr., Brabb, E.E., and Clark, J.C., 1978, Preliminary geologic map of the Qhb Qhl Qhfp Qhc Shear foliation or cleavage Qal Qls Qt Tls Sandstone and mudstone SAN JOSE SAN JOSE LICK ISABEL MT. STAKES WILCOX ORESTIMBA NEWMAN Laurel quadrangle, Santa Cruz and Santa Clara Counties, California: U.S. 10 Qad Qpf QUATERNARY Inclined WEST EAST OBSERVATORY VALLEY RIDGE PEAK Geological Survey Open-file Map 78-84, scale 1:24,000. Qa Qmt Qof Qaf Qoa Tcm Mottled mudstone and sandstone of Mount Chual (lower Eocene)Locally includes: Vertical 3. Burford, R.O., 1961, Geology of the Glenwood Basin area, Santa Cruz Mountains, California: Stanford, California, Stanford University graduate report, 30 p., scale Pleistocene 10 1:24,000. Tcms Sandstone lenses Joint 4. Smith, R.K., 1971, Foraminiferal studies in the lower and middle Tertiary of Soquel 5 LOS GATOS MORGAN HILL MT. SIZER MISSISSIPPI MUSTANG CREVISON Creek, Santa Clara County, California: University of California Publications in QTf Tcml Limestone Lineation directionShowing rake SANTA HOWARD QTsc TERESA CREEK PEAK PEAK RANCH Geological Sciences, v. 91, p. 1-111. Pliocene TERTIARY HILLS Great Valley Sequence (Cretaceous and Jurassic)Consists of: FoldsDashed where approximate, dotted where concealed, 5. Dupr , W.R., 1975, Maps showing geology and liquefaction potential of Quaternary Unconformity queried where uncertain deposits in Santa Cruz County, California: U.S. Geological Survey Misc. Field Studies Map MF-648, scale 1:62,500. TERTIARY AND OLDER ROCK UNITS Kus Sandstone and shale (Upper Cretaceous) Synclinal axisShowing direction of plunge 6. Clark, J.C., and Brabb, E.E., field work, 1988-89. Anticlinal axisShowing direction of plunge LAUREL LOMA PRIETA MT. MADONNA GILROY GILROY PACHECO PACHECO SAN LUIS DAM Southwest of San Andreas fault Northeast of San Andreas fault Kuc Conglomerate (Upper Cretaceous) HOT SPRINGS PEAK PASS 7. Clark, J.C., and McLaughlin, R.J., field work, 1989. Overturned syncline Santa Cruz Block 8. Sarna-Wojcicki, A.M., Pampeyan, E.H., and Hall, N.T., 1975, Map showing recently New Almaden Block KJm Mudstone (Lower Cretaceous and Upper Jurassic) Overturned anticline active breaks along the San Andreas fault between the central Santa Cruz Mountains and the northern Gablin Range, California: U.S. Geological Survey Antiformal axis Jssp Sedimentary serpentinite (Upper Jurassic) Misc. Field Studies Map MF-640, scale 1:24,000. Pliocene 20 Tp 9. McLaughlin, R.J., field work, 1988-91. Jt Altered tuff of Mount Umunhum (Jurassic?) Outcrop-scale synclineShowing plunge Figure 1. Index map of 7.5' quadrangles in the 1:100,000 San Jose quadrangle. Area of this report indicated in red. 10. Clark, J.C., and Rietman, J.D., 1973, Oligocene stratigraphy, tectonics, and Tsc Jdb Diabase breccia of Mount Umunhum (Jurassic?) Outcrop-scale anticline paleogeography southwest of the San Andreas fault, Santa Cruz Mountains and Gabilan Range, California Coast Ranges: U.S. Geological Survey Professional Tsm 20 Paper 783, 18 p. with map and sections, scale 1:125,000. Coast Range Ophiolite (Jurassic)Consists of: Outcrop-scale anticlineShowing plunge Unconformity 11. Dibblee, T.W., Jr., and Brabb, E.E., 1980, Preliminary geologic map of the Loma Prieta quadrangle, Santa Cruz and Santa Clara Counties, California: U.S. Jovb Quartz-keratophyre breccia and siliceous tuff (Upper and Middle Jurassic) Outcrop-scale complex folds Geological Survey Open-File Map 80-944, scale 1:24,000. Los Gatos Santa Teresa Hills Morgan Hill 20 12. McLaughlin, R.J., field work, 1988. Jov Basalt, andesite, and dacite (Middle Jurassic or older) Outcrop-scale complex foldsShowing plunge Fault 29 SCALE 1:125 000 21, 27 21, 16 21 13. McLaughlin, R.J., Simoni, T.R., Osbun, E.D., and Bauer, P.G., 1971, Preliminary ? 20 20 Tus 1 0 1 2 3 4 5 6 7 8 9 10 MILES geologic map of the Loma Prieta-Mount Madonna area, Santa Clara and Santa Tm ? Joi Intrusive complex (Jurassic) Outcrop-scale foldsShowing plunge and dip of axial plane 10 10 Miocene 1 0 1 2 3 4 5 6 7 8 9 10 11 12 KILOMETERS Cruz Counties, California: U.S. Geological Survey Open-File Map, scale Ttv 16 Tlo 1:24,000. K-Ar 16 sc 15.6 Ma Jog Gabbro cumulates (Jurassic) Outcrop-scale complex folds Showing dip of axial plane 9 10 Unconformity Tms 21, 16 28 14. Osbun, E.D., 1975, Geology of the Sveadal area, Southern Santa Cruz Mountains, 27 24 32 20 21 California: San Jose State University, M.S. thesis, 156 p., with map, scale ? 16 Jou Ultramafic cumulates (Jurassic) Outcrop-scale complex foldsShowing plunge and dip of axial plane 1:12,000. ? 10 La Honda Sierra Azul Fault 31,32 15. Simoni, T.R., Jr., 1974, Geology of the Loma Prieta area, Santa Clara and Santa Cruz Subsidiary Block and TERTIARY Jos Serpentinized ultramafic rocks (Jurassic) 30 Oil drill hole surface location Counties, California: San Jose State University, M.S. thesis, 75 p., with map, scale Block related rocks in 16 21 Santa Teresa 21 1:12,000. ? Hills Jsl Slate of Loma Prieta Peak (Jurassic?) Subsurface course of abandoned railroad tunnel southwest of Wright 9 16 16. Bailey, E.H., and Everhart, D.C., 1964, Geology and quicksilver deposits of the New Tla 31 Almaden District, Santa Clara County, California: U.S. Geological Survey Tt dbc Diabase of Corralitos Creek (lower Miocene or Jurassic) Earthquake mainshock epicenterOctober 17, 1989 8, 19 Professional Paper 360, 206 p. Minor modifications to geology by McLaughlin, Loma Prieta earthquake. Located in southeastern Laurel R.J., 1990-96. Also, Stanley, R.G., and McLaughlin, R.J., 1995-97, field work 32 Tv ? ? quadrangle. Focal depth was 17 km (see text discussion) MAP and sampling for petroleum source rock and biostratigraphic studies. Tvb Southwest of San Andreas fault 16 dbc2 ? ? Tz 2 Santa Cruz Block A' dbm Unconformity 17. Brabb, E.E., field work, 1969. ? ? 18, 20, 22, 23, 26 A Locations of structure sections shown on geologic maps Oligocene Tp Purisima Formation (Pliocene and upper Miocene) 9, 17 8, 19, 23, 26 18. Clark, J.C., and Brabb, E.E., field work 1990-91. Tme 32 Tsr Mine adit 9 31 21 Tlm Tsc Santa Cruz Mudstone (upper Miocene) 19. Clark, J.C., and McLaughlin, R.J., field work, 1990-91. 18, 20 9, 25 9 9 Tst 31 Ben Lomond Mine shaft 33 20. Dibblee, T.W., Jr., and Brabb, E.E., 1978, Preliminary geologic map of the Los Gatos Tls Tsm Santa Margarita Sandstone (upper Miocene) Subsidiary 8, 9 12, 13 Quadrangle, Santa Clara and Santa Cruz Counties, California: U.S. Geological Eocene Block 32, 35 Survey Open-File Report 78-453, scale 1:24,000. Tbm 2, 7, 8 Tbu Oil seep Tcms Tm Monterey Formation (middle Miocene) Tbc Tbs 21 BOUNDARY 21. Helley, E.J., photogeology and field checking, with additions by McLaughlin in Tcm 12, 13, 15 21 34 uplands, tributary stream valleys, and along valley margins, 1989-91. Base not exposed Quarry 32, 33 Unconformity Fault Tcml 1, 2 Fault Tlo Lompico Sandstone (middle and lower Miocene) 22. Johnson, R.E., and Associates, 1989, Fault investigation report, Loma Prieta Paleocene 32, 35 32, 36 Elementary School, Santa Clara County, California: Loma Prieta School District La Honda and Ben Lomond Subsidiary Blocks Trench siteshown locally 12, 13, 14 32,33,36 21 Open-File Report, 50 p. Great Valley Sequence Franciscan Complex Tla Lambert Shale (lower Miocene) 2, 3, 4, 5, 6 32, 36 21 32, 34 Area of hydrothermal alteration 6, 8, 11, 12 23. Keefer, D.K., 1991, Geologic hazards in the Summit Ridge area of the Santa Cruz bs v ? 32, 36 Mountains, Santa Cruz County, California, evaluated in response to the October Tv Vaqueros Formation (lower Miocene and Oligocene)Locally includes: 17, 1989, Loma Prieta Earthquake: Report of the technical Advisory Group: U.S. Kus ch 33, 36 Geological Survey Open-File Report 91-618. LandslideArrows indicate direction of movement 32, fm Tvb Basalt flows (upper Oligocene) Kuc 34 34 am 24. McLaughlin, R.J., and Harden, J.W., Site visit to Shannon fault trenched by Emcon Qls ? 12, 13 Associates, 1989. Fault cg mdi Kgr Fault Tz Zayante Sandstone (lower Miocene and Oligocene) 21, 5, 32, 33 ? fpl Rotational block-style landslideArrows indicate 5, 6, 10, 11 25. McLaughlin, R.J., Loma Prieta earthquake investigation, surface deformation data, fms CRETACEOUS direction of movement, hachured line indicates 1989. San Lorenzo Formation (Oligocene and Eocene)Consists of: Qls block boundary 32 21 fpv Unconformity 32, 35 26. Ponti, D.J., and Wells, R.E., 1991, Off-fault ground ruptures in the Santa Cruz Mountains, California: Ridge-top spreading versus tectonic extension during the Tsr Rices Mudstone Member (Oligocene and late Eocene) fpt Fault 1989 Loma Prieta earthquake: Bulletin of the Seismological Society of America, KJm Tvb Rotational block-style landslideShowing coherent 32 32, 33, 35 34 v.
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