LATEE TERTIARY (MIOCENE AND PLIOCENE). 



815 



Tentative correlation of formations of SumTuerland district vnth the standard California Coast 



Range and Santa Clara Valley sections. 



Era. 



Cenozoic. 



Mesozoic . 



System. 



Quaternary. 



Tertiary. 



Cretaceous. 



Jurassic (?). 



Series. 



Recent. 



Pleistocene. 



Pliocene. 



Miocene. 



Oligocene. 



Standard Coast 

 Range section. 



Alluvium. 



San Pedro. 



— Unconformity - 

 Merced. 



Summerland district 

 section . 



Alluvium. 



Marine and stream de 

 posits. 



Unconformity 



Purisima. 



San Pablo. 

 — Unconformity- 

 Monterey. 



Vaqueroa. 



Fernando. 



-Unconformity - 



Monterey. 



Vaqueros. 



San Lorenzo. 



-Unconformity ? - 



Eocene. 



Tejon. 



Martinez. 



— Unconformity? — 

 Chico. 



— Unconformity — 

 Horsetown. 



— Unconformity — 

 Knoxville. 



— Unconformity — 

 Franciscan , 



— Unconformity — 

 Granite, schist, etc. 



{Red beds. 

 Lower s a n d • 

 stone. 



Santa Clara 

 Valley section. 



Alluvium. 



Sand and gravel. 

 Unconformity- 



Topatopa. 



(?) 



Franciscan? (fide Whit- 

 ney). 



Fernando. 



-Unconformity- 



Modelo ■ 



f Shale. 



Upper sand- 

 stone. 



Shale. 



Lower sand- 

 stone. 



Vaqueros. 



f Upper. 

 F -■ 



Sespe < Red beds. 

 [Lower. 



Topatopa. 



(?) 



Unconformity — 



Granite, gneiss, etc. 



I-J 10-11. COAST RANGE, CALIFORNIA. 



Lawson ^^^ states, in a paper on the geological section of the middle Coast 

 Ranges : 



The paper is an attempt to summarize recently acquired information as to the sequence of 

 formations and their respective volumes of sediments in the middle Coast Ranges of California. 

 The results given for the thickness are approximations sufficiently close to afford a general idea 

 of the section. Other features of the paper are the subdivision of the Franciscan into seven 

 stratigraphic subdivisions by the recognition of a persistent horizon of foraminiferal limestone 

 and two important horizons of radiolarian chert; a similar subdivision of the Monterey into 

 seven stages and a summary announcement of the character and history of the post-Monterey 

 Tertiary. The essential features of the paper are given in the following tabulation: 



