304

305

303

304304

305305

303303

2 1 0345 6789101112

2 1345 6789101112meters

Elev

atio

n (m

eter

s)

0West East

TRENCH JC11N NORTH WALL

0 1 2 3 4 65 7 8 9 10

meters

304

303

305

0 1 2 3 4 65 7 8 9 10 11 12

11 12

304304

303303

305305TRENCH JC11N SOUTH WALL

East West

Elev

atio

n (m

eter

s)

JC11N16JC11N16

JC11N18JC11N18 JC11N19JC11N19

JC11N17JC11N17

JC11N2JC11N2

JC11N3(C03)

JC11N3(C03)

JC11N6JC11N6JC11N5JC11N5

JC11N7JC11N7

J5 J5

bouldercast protrudes

into Unit A

bouldercast protrudes

into Unit Aboulder

protrudesinto Unit A

boulderprotrudes

into Unit A

small shale blockssmall shale blocks

large shale blockslarge shale blocks

boulders protrudeinto Unit A

boulders protrudeinto Unit A

gc ≤5 cm thickgc ≤5 cm thick

bouldercast protrudes

into Unit A

bouldercast protrudes

into Unit A

ANDESITE BOULDER

ANDESITE BOULDER??

???? ?? ?? ??

????????

????

??

??

??

??

??

??

????

??

??

??

?? ??

prominent

clay shearprom

inent

clay shear

clay-�lled

shear, 1-2 cmclay-�lled

shear, 1-2 cm

clay-�lled

shear, 1-2 cm

clay-�lled

shear, 1-2 cm

clay-

�lle

d sh

ear

clay-

�lle

d sh

ear

well-rounded

subhorizontal

clastwell-rounded

subhorizontal

clast

unit Aunit A

shal

esh

ale

wea

ther

edsh

ale

wea

ther

edsh

ale

wea

ther

edsh

ale

wea

ther

edsh

ale

weathered

shaleweathered

shale

weathered

shaleweathered

shale

OGGOGG OGGOGGOGGOGG OGG

OGG

OGGOGG

CO3 veins

CO3 veins

unit Bunit B

unit Bunit B

E1E1

??

????

????

??

??

??

??

????

??

JC11N1AJC11N1A

JC11N1BJC11N1BJC11N4JC11N4

JC11N9JC11N9JC11N8JC11N8

OGGOGGOGGOGG

OGGOGG

DS

DS

large shale blocks

large shale blocks

shea

r zon

e

shea

r zon

e

ANDESITE BOULDER

ANDESITE BOULDER

unit Aunit A

E1E1

unit Bunit B

LDFLDF

Lower debris flow(s?):interbedded with shalycolluvium near fault

Cretaceous shale, Franciscan Complex

Colluvium: lightbrown silty sandwith detrital shale

unitA

unitB

shale

LDF

EXPLANATION

Upper debris flow:cobbles & bouldersin dark brown clay

Contact––Dashed where approximated; dotted where inferredFault––Dashed where approximated; dotted where inferred

Event horizon

Minor shear

Radiocarbon sample location–– squares & rectangles indicate bulk samples

00A21

E1ABBREVIATIONSDSgcOGG

disturbed shalegray clayolive gray grit

Pollen sample locationJ9 J9

Figure 2. Map showing locations of 2011–12 trenches (green lines), at Jerd Creek trench site on the Berryessa Fault. Survey markers (yellow triangles) of the USGS alinement array BWJC (McFarland and others, 2014). IS mark is used as the control point for trench surveys: -122.342355°E, +38.654933°N (WGS84, elev. 305.2 m Geoid99). Contour intervals: thick brown (5 m), thin brown (1 m), faint brown (0.5 m). Fault location by geomorphic interpretation (Lienkaemper, 2012) and from trench exposures (this study). Base is 2009 NAIP 1-m color digital orthophoto map. Breached sag pond (thin dark blue line).

310310

310310

320320

330330

300300

320320

330330

OSOS

ESES

ISIS

00 2020 4040 6060 8080 100100MetersMeters

JC11NJC11N

JC11SJC11S

JC12NJC12N

JC12SJC12S

BE R

R Y E S S A FA

ULT

BE R

R Y E S S A FA

ULT

Je

rd

Cr

ee

k

Je

rd

Cr

ee

k

122° W122° W123° W123° W

39° N39° N

38° N38° N

20 0 2010 km

Jerd CreekTRENCH

SITE

Jerd CreekTRENCH

SITESa

n

An

dr

ea

s

fa

ul

t

Sa

n

An

dr

ea

s

Fa

ul

t

Gr

ee

n

Va

ll

ey

f

au

lt

Gr

ee

n

Va

ll

ey

F

au

lt

Rodgers Creek fa ult

Rodgers Creek Fa a ul t

Ca

l av

er

as

fa

ul t

Ca

l av

er

as

F a ul t

Greenvil le fault

Greenvil le Fault

Ha

yw

ar

d

fa

ul

t

Ha

yw

ar

d

Fa

ul

t

Ma

ac

am

a f

au

l t

Ma

ac

am

a F

au

l t

BS

FB

SF

HC

FH

CF

B

F

B

F

WVWV

S

C

A

W

Figure 1. Location of Jerd Creek trench site (star) on the Berryessa Fault (BF). Holocene active faults (black lines) from USGS and CGS (2006) except for BSF (Bartlett Springs Fault; Lienkaemper, 2010) and BF (Berryessa Fault and adjacent parts of HCF, Hunting Creek Fault, and Green Valley Fault (GVF) north of WV, Wooden Valley; Lienkaemper, 2012). Largest discontinuities in the GVF from north to south: W, Wilson Valley; S, Stone Corral; C, Berryessa connector; A, Alamo stepover.

7 FEET1 10 2 3 4 5 6

.5 1 METER1 0

Logs and Data from Trenches Across the Berryessa Fault at the Jerd Creek Site, Northeastern Napa County, California, 2011–2012

ByJames J. Lienkaemper, Carla M. Rosa, Ian J. Cappelle, Evan M. Wolf, Nichole E. Knepprath,Lucille A. Piety, Sarah A. Derouin, Liam M. Reidy, Joanna L. Redwine, and Robert R. Sickler

2014

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

Open-File Report 2014-1033Sheet 1 of 4

Pamphlet accompanies map

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.

For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO 80225, 1–888–ASK–USGS

Digital files available at http://pubs.usgs.gov/of/2014/1033/

Suggested Citation: Lienkaemper, J.J., Rosa, C.M., Cappelle, I.J., Wolf, E.M., Knepprath, N.E., Piety, L.A., Derouin, S.A., Reidy, L.M., Redwine, J.L., and Sickler, R.R., 2014, Logs and data from trenches across the Berryessa Fault at Jerd Creek site, northeastern Napa County, California: U.S. Geological Survey Open-File Report 2014-1033, pamphlet 6 p., 4 sheets [http://dx.doi.org/10.3133/ofr20141033].

Manuscript approved for publication Feb. 19, 2014

ISSN 2331-1258 (online)http://dx.doi.org/10.3133/ofr20141033