14 15 13 12 14 15 13 12 14 13 12 11 10 9 8 7 6 5 4 14 13 12 11 10 9 8 7 6 5 4 meters Ap/fill(?) FILL swirls swirls swirls swirls swirls gc ashy silt liqfn. liqfn. dike dike liqfn. dike ashy ashy ashy ashy ashy shelly shelly shelly shelly shelly shelly shelly shelly shelly shelly shelly shelly gray gray clay clay gray clay gray gray clay clay gray clay k 01A10 dz dz E4 E6 E2 E3 E1 BSC BSC BSC1 BSC1 BSC BSC BSC1 BSC BSC BSC2 BSC2 BSC BSC BSC2 BSC2 BSC2 BSC BSC BSC2 BSC2 BSC BSC BSC3 BSC3 BSC BSC BSC2 BSC2 BSC BSC BSC3 S1 C1 S4 S2 C4 C3 C2 S3 osc osc osc u80 u95 u90 u92 u125 u120 u140 u300 u350 u400 u450 u500 u550 u130 u135 u250 u200 u110 u70 u80 u50 u63 u61 block cl st cl st cl st sd st sd st orange sd st gray cl st bn cl st disturbed disturbed distur- bed TRENCH 01A NORTH WALL u45 u41 u31 u20 E5 E8 E8 E9 E10 E11 01A01 u100 E7 West East 14 13 12 11 10 8 9 7 6 5 4 14 13 12 meters 15 14 13 12 15 14 13 12 11 10 8 9 7 6 5 4 ? ? ? ? ? ? ? ? ? 01A03 01A04 01A06 01A02 01A07 01A09 01A08 01A05 East West k k? k plastic FILL swirls swirls swirls swirls swirls swirls swirls swirls swirls gc ashy silt liqfn. liqfn. dike dike liqfn. dike ashy ashy ashy ashy ashy gray clay shelly shelly shelly shelly shelly shelly k E4 E6 E7 E8 E8 E9 E10 E11 E5 E2 E3 E1 S1 C1 S4 S2 C4 C3 C2 S3 osc osc osc u80 u100 u95 u90 u92 u125 u140 u300 u350 u400 u450 u500 u550 u130 u135 u250 u200 u110 u80 u50 u20 u41 u63 u61 gc gc gc u31 u45 u70 BSC BSC BSC1 BSC1 BSC BSC BSC1 BSC BSC BSC1 BSC1 BSC BSC BSC2 BSC2 BSC BSC BSC1 BSC1 BSC BSC BSC2 BSC BSC BSC1 BSC1 BSC BSC BSC3 BSC3 BSC BSC BSC1 BSC1 BSC BSC BSC3 sd cl st sd cl st cl st cl st cl st highly disturbed disturbed TRENCH 01A SOUTH WALL U.S. DEP AR TMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 03-488 Sheet 1 of 8, Version 3.0 Pamphlet accompanies map 2003 By 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. Available on World Wide Web at http://pubs.usgs.gov/of/2003/of03-488/ Any use of trade, firm, or product names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government Manuscript approved for publication December 22, 2003 James J. Lienkaemper, Patrick L. Williams, Timothy E. Dawson, Stephen F. Personius, Gordon G. Seitz, Samuel J. Heller and David P. Schwartz 7 FEET 1 1 0 2 3 4 5 6 .5 1 METER 1 0 LOGS AND DATA FROM TRENCHES ACROSS THE HAYWARD FAULT AT TYSON'S LAGOON (TULE POND), FREMONT, ALAMEDA COUNTY, CALIFORNIA, 2001-2003 Organic clayey silt Blocky scarp colluvium Blocky scarp colluvium Blocky scarp colluvium Organic clayey silt u400 u300 BSC2 BSC1 u200 EXPLANATION Organic clayey silt Orange silty clay* Contact––Dashed, approximate; dotted, inferred Fault––Dashed, approximate; dotted, inferred Event horizon Unit number Krotovina––infilled burrow Minor shear Fissure or crack––Open or filled voids without distinguishable slip, possibly tectonic in origin Radiocarbon sample location–– rectangle indicates bulk samples u80 u80 00A21 A3 ABBREVIATIONS k bsc cl gc gv m sd st rk blocky scarp colluvium clay gray clay gravel medium sand silt rock Banded brown clays & silts Charcoal-rich sand Banded organic silty clay with charcoal Dark brown clayey silt Interbedded sands and clays u70(cd) u61(h) u41(p) Dark brown clayey silt u31(qr) Yellow brown sandy silt u20(stu) u45(j-o) u50(i)