EZ
a= U.S. DEPARTMENT OF THE INTERIOR PROFESSIONAL PAPER 1550-E

science for a changing world U.S. GEOLOGICAL SURVEY PLATE 2 OF 3
BEN LOMOND LA HONDA SAN ANDREAS SIERRA AZUL AND UVAS, LOS CAPITANCILLOS, AND
BLOCK BLOCK FAULT EL SOMBROSO BLOCKS 7 SANTA TERESA BLOCKS
wl w O)@ ae
S S
7 os Z2 0
Sry. a a) a Pe
«2 2.**-2° Conglomerate sandstone Hols (3.4 Ma) Soa
foes 8 & =| Shallow-marine Purisima Formation (210+ m) Glow SOG 5 Fluvial Santa Clara Formation
S\5 WY] | rower bathyal, S25 ) i acustrine (lower part of section only) ~4.8 Ma
Sandstone = Santa Cruz Mudstone (0-20 m) Purisima |, Gi) abyssal Shale and, ato ‘NconFonwiry
. y Santa Margarita Sandstone (2-25 ml Formation 8|ac sandstone Blancan
a (820 m) 1 |S | gemommanto of Highland =| vertebrates Monterey Shale
Mudstone and shale ao Neritic-marine WWioriterey Formation (115 m) w [GS d Way (1100) Yu 3 (400 m)
SS Shallow-maring shel Lompico Sandstone (75 m) sg caNFoRNTAY nN wee S Wert to upper
NON 8a 5.
. TnconFonity } im Bsesnen
Siltstone Bathyal, abyssal Sandstone S525| ~
w middle to lower and shale of 2258 ase Dacite tuff, breccia, intrusives (60 m)
Bathyal, inner- Be fan or slope Loma Chiquita wins Tshelt K-Ar 15.640.2 Ma
Mottled mudstone and shale fan channel Santa Ci Z Ridge (900 m) og5z8 a }- Temblor Sandstone (150-200 m)
y anenannel wmudstone o-00m) | SEESS _| Olgneane or cary uconroriary
gesess Bioclastic beds wS ‘Santa Margarita +2 Bathyal, middle to | w fe: Unnamed shale and sandstone (300 m)
geses Bioclastic beds SZ Sandstone (0-85 m) > Z lower tanorsiope TRusT FAULT A
Glauconite bed 5 Henpeyste* | eo srownonus Batya midlet
oO-O-9 lauconite be 3 F (E"RELIZIAN) Lompico Sandstone | 4 M “ ==
Z lottled mudstone hannelized
g a tu | low-O upper (70m) Lower-bathyal, ‘and sandstone of = channel
Volcanic interbeds and intrusives os pete® Z_ middle bathyal Lambert Shall Sheloy net Me Chual 200m) ws (Pa-P9, cPIn) Hoclests sandetone and imestone
s sives esata 3B ucesian tao ate outer shetpmoroe eG BES (PsPr) bioclas
eee regression BN tower bathyal
~~ ee < wi | Basalt fan or slope transport > , ‘nconrontary
+0 130 Ma Ker 23.7 +0.7 Ma from shelf ENUATION — Pages eB Unnamed concretionary
a2 ne Alluvial Sioa —Zayante 2 High energy, shallow roo shale, silty sandstone (350 m)
BASEMENT ROCKS Se {fem fe gee =| 3e (Se 588 un
(105+ m) timer fan bathyal -
nwa rig =
i i oa -U 91 |v. og Sandstone, shale, he +
Foliated metaclastic rocks ao | Pb-U 91-130 Ma Shallow-marine Vaqueros, zz and conglomeraté <2 Fe
. . . uo | shelf to deep-sed (820m) ge ofthe Sierra Azul 3 }= 7" +=] Coast Range ophiolite
Granitic and other undifferentiated Sa i fan S 2 S =z fee 4] (750m)
stalli 5 es Upper mantic? 4 we
crystalline rocks uw =) 3D (harzburgite) pas |
a zs Inner to mid fan, = Fe
Gabbro of Logan =) or channeled He tt artenuarion auts
S slope (displace clastic Mesozoic rocks of Great Valley
i] (disp! y
. 7 2 eS j Fea} Sequence and ophiolte down-section)
Foliated anorthositic gabbro of a cS a re
Logan \ bcos s x =H COAST RANGE FAULT
VERTICAL SCALE (EMORRIAN) Mutone <a a S ;, comp
q (400-700 m o iN ranciscan Complex
Quartz keratophyre breccia FEET METERS beget GATE JURASSIC Basin |. Lower GreatValley Li Accretionary/ | i (Bald Mountain, Permanente
; 7 1000 5 nerite CRETACEOUS plain Sequence (<180m) © = / | complex LA) terranes of Central belt,
Basaltic to andesitic tuff, chert, 1 200 Quartz keratophyre cs © BS. ‘| with sheared-in Great Valley
and flow breccia q Breccia, chert tuft 9H =| sequence and Coast Range
4 (REFUGIAN) COAST Flows, flow g3 iN ophiolite)
‘asaltic to andesitic pillow flows ~~ Tow-0 Iwobar Shale breccias,
Basaltic to andesitic pillow fi iE totam) Oceanic are Se ue
basinal 150 m basalt to =
Dioritic to diabasic dikes and sill ondeste 7 ES fi
jioritic to diabasic dikes and sills r 200 (NARIZIAN) EAA
1000 + ws Lower bathyal,
2 id-fan inter Dikes, sis,
Gabbro cumulates + 300 a thennat Butano Sandstone RANGE i diorite to
a (1100+ m) Pb-U>168 Ma Giabase fs
Ultramafic cumulates 2000 + 600 w j=
sg Gi
Ultramafic rocks and noncumulates L 90 o oO (e IS
id a = fs
. J = n S f/f
Franciscan Complex, terranes of 3000 = 3 Oceanic arc ‘= /s
s/s
the Central belt Eo > iS fs
* Units penetrated in Bean Ltd. u ; , OPHIOLITE Cumulate
Hihn #1 well (McLaughlin and ea | aa e1500m) abbr
others, 1988; see Section 7, 32 ipewiinad Depth to top. Cumulate
Plate 1, this paper) AX Kunsouraray | 2000 m1 455909100 m ‘ultramafics
Pb-U 161 Ma ——F3<
cc
G
a (eeanic COAST RANGE FAULT
ogan
S| 522mm Sen om)
o
2 OF | Accretionary Franciscan Complex
FZ | complex (Bald Mountain and
J of Permanente terranes
ZR 1 Bo of Central belt)
2 | Q
| a3
2 5a
| Sa |
a
| |

Stratigraphic Columns Across the San Andreas Fault in the Loma Prieta Region, California,

Comparing Differences in Thickness, Lithology, and Basement Rock Types in Major Fault Blocks
By
Robert J. McLaughlin, Joseph C. Clark, Earl E. Brabb,

Edward J. Helley, and Carl M. Wentworth
2004 © Pred on eres paper