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Valyermo Crystal Lake Yucaipa Redlands San Bernardino South U.S. DEPARTMENT OF THE INTERIOR OPEN-FILE REPORT O3-293 U.S. GEOLOGICAL SURVEY Sheet 5 of 5 science for a changing world 118° 00' 117° 00' 34° 30' S 34° 30' u B n s i e g G Hill 4001 t R C Apple Valley ANI o TE M ve Carr Deadman OUN k TAIN Canyon e Point S e H r C o l Fifteenmile co m b l Juniper R k Point S id a A ge e Hills N c s e M Rabbit Valyermo A e Big John r O Dry Lake P N M D C J L U Big Rock R R Peak N E A i t C o A V Hesperia t Springs p c E le H S P k e l B F Phelan D e O P A e E a W iny U S E s h r o L R L T a L n T n o S v t Z e S A e R O ash N r V F id N W v I r l Bare i A g E ey a a e e ll i A s U w re T a T t c Mountain L C ek ab V Juniper re e T R N R le e C C S R id Phelan p U Flats C y y M o n n o o g l c e ou Peak e O o u k n t ta n M x t C in h r A e e North Peak ek y F Troop Mt Baden- D o Rattlesnake R White Mtn Cloudburst Peak C Mojave River r Powell Oak Wrightwood O Mountain k a Forks Reservoir Summit Circle j Spring S.G. River o Dam South Peak n Cajon Summit Iron Fork Mtn D e e p Waterman Road South Fork Wright Luna Mtn P C e Mtn r v k North Fork C a Mtn a Dawn a e o i n j Burnt C Lizard p ri e O'Day Cyn Pine t e y o Flats r r Ck Spring e F o xey o C e r rk L n k Co Hopi Flats R on Squaw M e r Pine y C Spring i e Cajon Pass d e Peak e k l w Little g v Mount San Mtn n o M e i P i l Crystal l Pine Flat S A N i a Cox Ck n i Shay Mtn R Antonio e Cajon K l Lake Junction W o Vincent Thrust Ca Cajon n Redonda n C ey Muddy Ridge y l e g h R i d g e Alpine on o r n Mount C Spring Little Silverwood Marie Louise k Shay Mtn Cyn No l r CLE Lake H eek e th GHORN olcomb Cr i n G A B R I E L r y b C F Cosy Dell Devils a r o FAULT Hole ate Telegraph rk SAN BERNARDINO G w Blue Cut d Peak Butler Peak S A N l L Cedar Pines k o o C n Iceh C Park C ou w s B a s Lake e G Midd e G a k A S le e F D B or r L o R I E L F A U L Cyn k b Arrowhead a T E o l e L N e Lake r S. Scotland y v H Cogswell We ork G t C st F . Riv. l i Crestline Gregory e e y l Reservoir g H n Heaps Peak n L Cow Can d y C E r y y i Cucamonga t L e o R le r MOUNTAINS n e E v Peak San Sevaine D E V I L Monrovia Pine Mtn i C o C e N i San Gabriel n k C A R r C N r D Lookout W Y O N T Peak a y D e P F A U L M O U N T A I N S t R y Reservoir o a e e Devore a i C e n F n n n k id A t Arrowhead y s n a e t e y n Morris O g o g U r C r Peak o C c e o C n L Running t k m Fredalba a Reservoir e o T S Keller Peak a y R s n g n a A Springs San Sevaine n d m i N n i y d n y a A g T l a a o R F yn Flats e A o c e er C San Sevaine Sycamore C n n i n C m a n u r i r y y b Canyon Flat C n n ASSEMBLAGE t o C D i C A p a S k y d N k w n y a G n o n A C e A e t n S l a S N e e NE e n r O l a d r Z S ASSEMBLAGE O N E h C CANYON ULT a Z FA G D A C n L T a n N S a g Johnston S F A U n a e I E S i N G A d D g Keller Cliffs M O S R y R B A i R n A Peak C n t M u A D U E i R E l F A U L T Z O N E C H A C P il S Bradbury S ls L A F MILL y N A CRE tl U EK e L FA Duarte C T U Glendora LT r Z O Monrovia e J N Azusa e A E s k C S San Bernardino Seven k E - c C I a o G N Highland Oaks Dam l A a n b j T s L Rialto o O B La Verne n n Cram Peak i Upland B ta R C e Rancho M r n ia r k u Cucamonga E Fontana l e n R i v e r e o to e re Ganesha S - a C ipa M C k a uca l S o W r Y Park e l n idge ri A t A R b o a d ill a n s M G T h a i e t n s n r Slover n l Sa Ontario r o l d a Hill a F s i n c S A ill H s a Guasti e U B n H e ge Pomona L S a to s n T an s af reek o Ra in r C J r Elephant C n ula Crestmore n a ns Hill a T le S eni im G m R k s n P S Grand o a Yucaipa ee E e t O ll etw Terrace eo Dunlap i y b G B c Z ndar h O u s N Hills M H d bo ill A o e N Acres ferre H Blue x E Yucaip In lt te R ins La Lo o a Valley e u ta Fa uen Jurupa Moun C W t ose P Mtn u S a J a n San 0 5 10 15 Km n p n sh Yu ipa Creek e t r y ca a i on u R n S U L A Highgrove in g P N P E N I Riverside s s 34° 00' 34° 00' 118° 00' 117° 00' Rocks of the Peninsular Ranges Rocks of the San Gabriel Mountains Rocks of the San Bernardino Mountains Rocks bounded by Mission Creek segment assemblage. South of the quadrangle, assemblage. Includes basement (mostly assemblage. Includes basement (mostly of San of the Andreas Fault Zone, and the offset Peninsular Ranges rocks occur east concealed by Quaternary deposits) that is concealed by Quaternary deposits) of the Mill Creek Fault of the San Jacinto Fault offset by the San Jacinto Fault Mojave Desert, which is similar to San Bernardino Mountains basement Figure 1. Map of San Bernardino 30' X 60' quadrangle showing place names used in Description of Map Units, Regional Synthesis, and Geologic Notes. Colored areas define structural assemblages. Approximate locations of most faults having large displacements or lengths are shown. Inferred boundary between Peninsular Ranges and San Gabriel Mountains assemblages is hidden beneath thick Quaternary deposits, and its location and character are highly speculative. Town or geographic feature; Mountain Peak. SAN JUAQUIN A C O VALLEY AD R A SIERRANEV A S T N M G O J A V E S E San Bernardino D 30' X 60' quadrangle E S E R T T R A N S V E R S E R A N P G E A C S I F I C C O P E N L O I R O N A N S D C R U O E A N L D A G A E N E R S S E R T Figure 2. Map showing San Bernardino 30' X 60' quadrangle in relation to physiographic provinces in southern California. Within the quadrangle, provinces and province boundaries do not conform to the rock assemblages designated in the geologic notes accompanying the DESCRIPTION OF MAP UNITS. Digital Preparation by: Source of Mapping: Source of Mapping: Source of Mapping: K.R.
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