PART I. 



TERTIARY AND PLEISTOCENE FORMATIONS OF CALIFORNIA. 



POST-CRETACEOUS GEOLOGIC COLUMN. 



The process of niiirine .seiliiiientatiou has been going on at one place or another 

 witliin the California province almost without interruption since 

 the beginning of the Cretaceous, and as a result the greater por- 

 tion of this long period is represented by formations which, 

 outcrop over nuich of the territory l)etween the Sierra Nevada 

 mountain I'ange and the Pacific Ocean. The only great l)reak 

 in the record, as shown by the faiuias of the ditl'erent forma- 

 tions, is that ))etween the Tejon (Eocene) and its overlying beds. 

 Each of the other formations is more or less closely related 

 faunally to those immediately- above or below, where the forma- 

 tions are of a more or less similar lithologic character. 



The stratigi'uphic relations between adjacent formations xavy 

 in different localities. At one place two formations may l)e 

 separated by a maiked unconformity, while at another locality, 

 only a comparatively short distance away from the first, the 

 same formations may rest in an apparently conformable posi- 

 tion with relation to each other. In general, however, the 

 relations existing between the different formations is that indi- 

 cated by the accompanying diagram of the California post- 

 Cretaceous column. 



POST-CRETACEOUS CORRELATION TABLE. . 



The following correlation table of the principal marine 

 Tertiary and Pleistocene formations of California, together 

 with a In'ief outline of the typical ones, is tentative and based 

 on the information at hand at the beginning of 19(»5. Further 

 study will doubtless add many new formations to the list, 

 some of which may represent horizons different from those 

 of the known division^, but the relative position of those 

 already known is probably about as indicated in the table. 



The faunal lists given under each formation comprise the 

 species found at the type locality of the formation, and, in 

 addition, such other species as are found in beds which have 

 been quite definitely correlated with the latter. These corre- 

 lations are necessarily very broad and are intended only to 

 indicate in a general way the contemporaneity of the strata 

 in question. The names used in the lists of fossils are tho.se Total thickness, 21.000 feet +. 



^ !■ 1 1 • Note. -Full lines repre- 



commonly applied to the respective species by the west coast .^cnt tmeonformit.v; broken 

 paleontologists. Owing to the imperfect state of our knowledge '""''■ '■""f°™">- 

 regarding the nomenclature of the California Tertiary fauna, there is a probability 



The Tertiary and PU-isto- 

 rene column of California. 



