3l8 CALIFORNIA ACADEMY OF SCIENCES. 



Feet. 

 15 Buff sandstone and drab clay with hard layers or nodules 

 of sandstone, containing Venus pajaroensis Con., Sili- 

 qua patula Dixon, etc. Very similar to beds at mouth 



of Purisima Creek 220 . 



Conglomerate and shell fragments. 



14 Several layers full of Crepidula grandis Midd 15 



13 Buff sandstone with Venus (Mactra) 10 



12 Beds with Crepidula grandis Midd. every few feet.. 40 



Seam of lignite. 

 11 Light drab sandstone, containing beds of conglomerate 



and shell fragments 100 



10 Buff colored sandstone 250 



9 Numerous scattered lamellibranchs. 



8 Buff colored sandstone .^ 160 



7 Lignite 1 



6 Drab argillaceous sandstone with pink jointing, contains 



Venus, etc. Same rock as a Pillar Point 200 



5 Same with few fossils. Tellina, etc 120 



4 Drab argillaceous rock 192 



3 Lower gasteropod beds. Several hard layers from 1-2 feet 

 thick containing a great abundance of gasteropods, also 



Scutella, Standella, etc 18 



2 Buff sandstone with few fossils 170 



1 Buff sandstone 100 



1 Buff sandstone 235 



Total thickness of the section, 4740 feet. 



Some of the upper beds are exposed in a long land- 

 slide, which has given a little uncertainty to a few of the 

 thicknesses. It is thought that the upper part of the sec- 

 tion as given here extends into the Pleistocene, but no 

 way was found of drawing the line. The upper beds 

 are practically horizontal and contained no fossils as far 

 as could be discovered. 



The long landslide mentioned gives a good opportunity 

 to study the variation in the layers. It is about a mile 

 long and the course agrees with the strike of the strata, 

 so that the beds are exposed horizontally the whole dis- 

 tance. It was found that in that distance there was quite 

 -a variation. The two beds of the strata called the upper 



