314 



The Philippine Journal of Science 



1913 



Table II. — Stratigraphy of the Echigo oil field, Echigo, Japan, according 



to T. Iki. 



Series. 



Character. 



Thickness. 



Recent . 





Meters. 



Pleistocene ... 



Diluvium; ancient river terraces 





Pleistocene or Pliocene. 



Unconsolidated clay, sand, and gravel 





Pliocene... 



Clayey shale, sandstone and conglomerate, and 

 lignite beds. 



Gray sandy shale and subordinate layers of sand- 

 stone in which oil exists. A bed of fossiliferous 

 limestone in this stage contains Lithothamnium 

 ramosissirnum Reuss. Shale is locally petrol- 

 iferous. Interbedded andesitic agglomerate. 



Black hard 6hale grading upward into gray sand- 

 stone. Interbedded andesitic agglomerate. 



Black shale with thin beds of bluish sandstone 

 and thick beds of white or bluish tuff sandstone 

 which is oil bearing. 







300-600 



600 

 1,800+ 



Miocene? (Lowest beds Eocene?) . 



