HomeMy WebLinkAboutGeologic Map: Upper Calabazas Index Sheet1
NOTE TO USERS.
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I
'THIS SE "r OF MAPS PROVIDES GEOLOGIC DATA BASED
ON DETAILED GROUND RECONNAISSANCE CONDUCTED DURING
THE ti10NTHS OF APRIL THROUGH SEPTEMBER, 1979, INTERPRE -�
j T•A'r1UN OF AERIAL. PHo "rOGRAPHS, AND A REVIEW OF PUBLISHED
AND UNPUBLISHED GEOLOGIC REPORTS AND MAPS. `THEY ARE
DESIGNED PRIMARILY FOR USE BY GEOLUGIS-rs, ENGINEERS, `
AND OTHER PROFESSIONAL EAR'm SCIENTIS-rs . HOWEVER, -rHEY
ARE NOT INTENDED AS A SUBs,r1,ru "rE FOR DETAILED 51'm
iNVE vote; WHICH ARE NECESSARY FOR CUNsTRUC•rION
i PURPOSES'.
! WHERE SPECIFIC: GEOLOGIC: FEA "rURES ARE SHOWN ON
i
rHESE , &1APS, FIELD CRITERIA WERE FOUND To suPPOR r THEIR
EXIS rENC.E • HOWEVER, ABSENCE OF APPROPRIA rE 5YMiB9LS
(E.G. LANDSLIDES, FAULTS, E,rc.) FROM ANY PAR "r OF 'THESE
MAWS MAY NOT BE USED -ro PROVE "rHE ABSENCE OF -rHOSE
FEATURES.
1 r '
•ADDI-rIONAL EXPLANATION AND DESCRIP -r1UN OF "rFIE
TYPES OF EAR,rH MATERIALS EXHIBITED ON THESE MAPS MAY
BE FOUND IN "rHE REPORT ENTITLED: OHOLOGIC 11AZARDS ;
A11ALYSIS OF TtIF UPPER CA4ABAZAS CREEK WAIF mIED,
SARA TOGA, CALIFORNIA, JANUARY 1980, BY WILLIAM Co -r -roe!
AND ASSOCIA,rES, INC. ALSO ANOTI•IE11 SE`r of MAPS
EN "rur LED: , GROUND 'i�fOVEiVEN 1" POTEi`I T /AL i%'I PS OF TtIE
UPPER 'CALARA'Z'AS CREEK IVArYRS11rD, SARATOGA,
CALIFORNIA HAS BEEN PREPARED BY INTERPRETATION OF
THE GEOLOGIC MAPS AND onIER INFORMATION. THE GROUND
MOvEMEN'r POTENTIAL MAPS MAY BE OF GREATER INTEREST
'ro TFIE NON - TECHNICAL USER.
Now• r _
!
I S.urf icia-I.-,_ D-eposi,ts
_
ARTIFICIAL FILL: BROKEN ROCK- ►MATETRIAL5 DERIVED
'Af FROM QUARRY OPERATIONS, ROAD mis *mug, rION,
AND �� D o-rFl
�R �,,r�1l�rrlG oPERAYrraN�. PREI�OP�II ►JAN r�:r
COMPOSED OF FRANq- 15C,A1 SANDST e AND SHALE.
DEBRIS, AND 3AND3TONE AND CONGLOMERATE OF THE
SANTA CLARA FORMA "rION .
• C OLLUVIUM: UNCONSOLIDATED MIX,rURE OF THICK
• •.• •• •• •• •.' SOIL, WEATHERED BEDROCK AND SLOPE WASH DEBRIS
• fflIICFI HAVE ACCUMULATED ON Mos'r FIILLSIDES AND
• IN SMALL GULLIES. mos,r OF THE THICKER COLLUVIAL
AREAS. (1.E• GREA -rER niAN 3 FEE-r) ARE CtIARAc-rER --
IZED BY SLOW, DOWNSLOPE SOIL CREEP ActivurY•
°rHE CONTAc -r BETWEEN COLLUVIUM AND BEDROCK IS
FIIGHLY GENERALIZED; TkrEREFORE 'rFIE Ex -rEN'r of
COLLUVIALI MATERIAL CAN VARY C:ONSIDEFZABLY FROM
THA-r DISPLAYED ON WrHE GEOLOGIC MAP SHEE *rs.
N
a •� . A
ALLUVIUM:
U N C
O NS
o
LIDA`rED S,rtEAM DEPO3
rs
o . o PKESEN'rLY i1,
WHICH ARE CONFINED
"ro Tim Tim C'rlvE
• � `-. s,rREAM CFIANELS AND ADJOINING Vt1LLE ( FLOORS;
. `." • (JIARAc'rEfi OF •rm3E DEP03in RANGE FROM VERY
COARSE, POORLY sovED MIX -rUREs OF COBBLES
AND SANDY GRAVELS TO FINE, CRUDELY s,rf;uvnFIED
DEPoSI rs,oF SAND, SIL r AND CLAY.
AarlvE I.ANO•SLIDE: ACTIVELY oft RECEN rLY MOVING
LANDSLIDE WIv1 FRESH, UNVEGE- rivrED SCARPS AND
AIS BROKEN GROUND, D. U►IDRi11NED DEPRE3110►f., AjID
ttEc ej rLY DinuRBED MAN-MADE TEA ruRES Oft VEGE
- r�1'r1Uw I •
r
fr Doit%jivi'r Li IIKAJUE: cufvRENT Y ���c, I 1► ,r 1 J-•. rE L1x � D -
AIDE`�ar�r tvffi �iTi8i Dr=ND0VL-*ROm%14\,i'S'CARP ,
ROUNDED HUMMOCKY SUR,F=r\ce f ovociAuwr1Y AND
t UNDIS 1 U RBF,U MAN- -MADE FEA ruRES AND VEGE rA riw4 .
OLD LAND3I.,IUE: RELrN,rvjEL'r TABLE, INAC'rIVE
0 L.�1 ► "1r�S�.IUE ��11'ri1 sU�3�aU�;U 1►trtE�.��aLr�'tfi rUl'Uc�f�lr�fiY,
LOW SLOPE i'U�I r1UN, "VELL Es rABL13HED DRAI`NACE
SY"'ral AND UI'IDIa'rURUED `JEGF•:rA'r1w4.
LIP,
...............
T�
t.Y ,
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-X P.,. LAN
t
li ATI
B :d roc k Units
. SANTA CLARA FORMATION: SEMI CONSOLI DATE D "ro
10T LOCALLY CON50LIDATED, CRUDELY STRATIFIED SEQUENCE
OF INTERBEDDED, YELLOW BROWN -rO RED BROWN CON -
GLOMERAT•E, POORLY SORTED SANDSTONE AND FINE-
GRAINED ROCKS SUCH AS SIL STONE, MuDs-rONE AND
CLAYSTONE; WEA,rHERS TO A LIGII-r ,rAN TO DEEP RED,
POORLY DEVELOPED, SANDY SOIL IN AREAS SITUA -rED
OVER *rHE COARSE- GRAINED BEDROCK SEcriONS
(I.E. CONGLOMERA,rE AND SAfIDS "TONE) AND 'r0 A DARK
GRAY -ro DEEP BROWtf CLAY- 111CFI SOIL OVER 'rFIE swr-
sTONE, muDs,rONE AND CLAYSTONE BEDROCK INTERVALS;
EXPANSIVE PRoPER-r1Es OF THESE SOILS VARY CONSIDER-
ABLY FROM PLACE 'ro PLACE; HOWEVER, THEY GENERALLY
BECOME HIGHLY EXPANSIVE IN THE AREAS UNDERLAIN BY
FINE - GRAINED BEDROCK.
FRANCISCAN COMPLEX: CONSOLIDA`rED 'r0• LOCALLY
KJf UNCONSOLIDATED, TAN To DARK GRAY, .MASSIVE -ro
-THICK BEDDED SEQUENCE OF FINE- -ro MEDIUM- GRAINED,
FRACTURED SANDSTONE (I.E. GRAYMYAC:KE) IN'rER-
LAYERED WITFI DARK SHALE AND SIL"rs -TONE, C:HER "r,
LIMESTONE AND GREENsToNE (I • E . ALrERED, MAFIC
VOLCANIC ROCK) ; COMMON EXPOSURES ARE CHARACTER -
IZED BY PEJtVASIVELY SHEARED AND FRAf.:rURED BED-
ROCK:; WEA'rmiRS -ro A CLAYEY, SILTY, SAND OR SANDY,
SILTY CLAY SOIL OF MODERA,rE EXPANSIvurY.
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69
s-rRIKE AND DIP of s,rRATIFICA-rION
s,rRIKE AND DIP OF VERTICAL s,rRA *nFIcA,rION
v
'r
STRIKE AND DIP of STRATIFICATION FROM OTHER SOURCES
STRIKE ANI) DIP OF FRACTURE SURFACE
s- rRIKE.AND DIP of VER"'rICAL FRACTURE SURFACE -
GEOLOGIC CoN*rAc "r: BE!`rWEEN EAR•rF1 MAxERIALS
•,,.�" `�" ' •• •
(I •E, BEDROCK AND SVRFICIAL) , DASHED WHERE
APPROXIMATE, Do -rrED WHERE CONCEALED.
FAULr CoN"mu :. DASHED WHERE APPROXIMATE,
49 �.•
uar•rm) WHERE ONCEALED, QUERIED WHERE
�.•
LOCATION 13 UNCER-rAIN; BARBS ARE LOCATED
ON UV17HROWN SIDE of FAUL•r, I'D" AND "Ulf
INDICA•rEs DOWN'mROWN AND UPTHROWN SIDE OF
FAQ! L: r .
BOUNDARY OF LANDSLIDE DEPOSrr, DASHED WHERE
APPROXIMATE, ARROWS SHOW DIRECTION OF DOWN ,
swpii MOVEMENT, HA'rCHERED LINES INDICATE HE >-
/'
WALL SC ARP AREA. fjuE.s•rON MARK INDICA*rEs
FECE A NNE
c •
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QUARRY
MAJOR cur S Lons
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MAJ0tl FILL J)LOPE's
5PRIM; OR `SEEPAGE AREA •
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