Page 5 - wintererdurham1962

CONTENTS

Page Page
Abstract------------------------------------------- 275 Stratigraphy—Continued
Introduction--------------------------------------- 276 Tertiary system—Continued
Purpose and scope------------------------------ 276 Pliocene series------------------------------ 308
Fieldwork-------------------------------------- 276 Pico formation------------------------- 308
Acknowledgments------------------------------- 276 Stratigraphy and lithology----------- 309
Geography----------------------------------------- 278 Newhall-Potrero area------------ 309
Climate--------------------------------------- 278 Newhall-Potrero oil field to East
Vegetation------------------------------------- 278 Canyon---------------------- 310
Santa Clara River------------------------------ 278 Mouth of East Canyon to San Fer
* Relief----------------------------------------- 278 nando Pass------------------ 3.11
Human activities------------------------------- 278 San Fernando Pass to San Gabriel
Physiography-------------------------------------- 278 fault------------------------ 3.11
Structural and lithologic control of drainage-------- 279 Santa Clara River to Del Valle
River terraces and old erosion surfaces- - - - - - - - - - - - 279 fault------------------------ 312
Present erosion cycle.---------------------------- 281 Del Valle fault to Holser fault-- - - 312
Landslides------------------------------------- 281 Area north of Holser fault-- - - - - 312
Stratigraphy--------------------------------------- 281 Fossils----------------------------- 313
Pre-Cretaceous rocks---------------------------- 282 Foraminifera------------------- 313
Tertiary system-------------------------------- 282 Megafossils-------------------- 315
Eocene series------------------------------- 282 Upper Pliocene and lower Pleistocene- - - - - - - - - 317
Fossils--------------------------------- 283 Saugus formation----------------------- 317
Age and correlation----------------- - - - - 283 Definition and subdivision----------- 317
Upper Eocene to lower Miocene- - - - - - - - - - - - - - 283 Stratigraphy and lithology----------- 317
Sespe(?) formation---------------------- 283 San Fernando Valley------------ 317
Miocene series------------------------------ 283 Area south of San Gabriel and Hol
Topanga.(?) formation------------------- 283 ser faults-------------------- 3.18
Mint Canyon formation-- - - - - - - - - - - - - - - - 284 Fossils----------------------------- 319
Nomenclature---------------------- 284 Age of youngest formations of mapped area---- 320
Distribution------------------------ 284 Towsley formation---------------------- 320
General lithology------------------- 284 Pico formation------------------------- 321
Thickness-------------------------- 284 Saugus formation----------------------- 322
Stratigraphic relations and age- - - - - - - 284 Quaternary system------------------------------ 322
Stratigraphy and lithology in mapped Pleistocene series--------------------------- 322
area----------------------------- 285 Terrace deposits------------------------ 322
Environment of deposition----------- 286 Alluvium------------------------------ 323
Modelo formation----------------------- 286 Turbidity current features in the Tertiary rocks---- 323
Stratigraphy and lithology----------- 287 Nature of turbidity currents----------------- 323
Fossils and age--------------------- 287 Interrupted gradations---------------------- 325
Upper Miocene and lower Pliocene------------ 287 Angular fragments in sandstone- - - - - - - - - - - - - - 325
Towsley formation---------------------- 287 Irregular contacts--------------------------- 326
Distribution------------------------ 287 Intraformational breccias-------------------- 327
Distinction from Modelo formation_ _ _ 288 Current marks------------------------------ 330
Previous assignment-- - - - - - - - - - - - - - - 288 Slump structures and convolute bedding-- - - - - - 332
Stratigraphy and lithology----------- 289 Structure------------------------------------------ 334
Santa Susana Mountains - - - - - - - - 289
Regional relations------------------------------- 334
San Fernando Pass and Elsmere
Structural history------------------------------- 334
Canyon area----------------- 291
Pre-Late Cretaceous------------------------- 334
North of the San Gabriel fault- - - 293
Late Cretaceous and early Tertiary-- - - - - - - - - - 334
Subsurface development- - - - - - - - - 293
Early and middle Miocene------------------- 335
Fossils----------------------------- 293
Late Miocene------------------------------ 335
Santa Susana Mountains_ _ _ _ _ _ _ _ 293
Elsmere Canyon region--- - - - - - - - 295 Pliocene and early Pleistocene(?) -- - - - - - - - - - - - 335
North of San Gabriel fault--- - - - - 306 Pleistocene-------------------------------- 335
Environment suggested.---------- 306 Late Pleistocene---------------------------- 335
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