3l6 CALIFORNIA ACADEMY OF SCIENCES. 



posed on Seven-Mile Beach; in other words, that the 

 Merced series was not laid down upon the igneous rock 

 of Mussel Rock, the contact between the two forma- 

 tions being plainly a fault contact. The absence of a large 

 part of the Transitional beds is evidence in the same 

 direction. 



This section does not include the fossiliferous Transi- 

 tion beds, of which no section was obtained. They 

 would probably carry the strata downward several hun- 

 dred feet, the rock being similar to the drab and pink 

 argillaceous sand so common above. 



The following- is the 



Section of Merced Series along Seven-Mile Beach: 



Feet. 



72 Variable layers of soft, yellow and orange sand 200 



71 Light colored argillaceous sand 6 



70 Hard ferruginous layer of brown sand 1 



69 Yellow and orange sand 8 



68 Hard layer light yellow sand 1 



67 Yellow sand 8 



66 Sand and fine gravel, cross bedded 12 



65 Layer of " Volcanic ash " of Lawson 1 



64 Yellow and orange sand 15 



63 Coarse gravel scattered in orange sand 4 



62 Yellow and orange sand 75 



61 Yellow sand containing recent fossils 10 



60 Drab argillaceous sand with red joint faces, containing 



plant remains and a few lamelli branches 40 



59 Upper bed, iipper gasteropod bed, light brown sand, full 



of shell and fragments 1-2 



58 Yellow sand .3 



57 Lower bed, upper gasteropod bed, dark gray sand 1-5 



Drab argillaceous sand with red joint faces 3-|- 



56 Drab argillaceous sand, red jointing, with plants (?) 20 



55 Light drab sand slightly cross bedded 35 



54 Layers fine conglomerate and shell fragments, very hard.. 15 



53 Bluish argillaceous sand 165 



52 Drab argillaceous sand, quite firm, with many scattered 



standella 10 



51 Soft sandstone 30 



