188 SOUTHERN CALIFORNIA GEOLOGY 



Section of Recent and Pleistocene Formations ex- 

 posed in the Outfall Sewer Excavations through La 

 Cienega Basin and La Ballona Pass, Los Angeles, Nos. 

 1-lOa inclusive are abbreviations of the original sec- 

 tion by Dr. A. J. Tieje\ Nos. 12-14 are additions by 

 the writer. 



14. Sandy soil, largely Recent outwash from 



adjacent regions 1-5 



13. Sandy loess-like eoliates 2-8 



(unconformity) 

 12. Finely-bedded, small-particled micaceous 

 sand and loam, with beds of peat inter- 

 layered, fresh-water shells and petrified, 

 stoney, silicified human bones at depths of 

 20 to 25 feet. Probably fresh-water lacus- 

 tral deposits of latest Pleistocene or Re- 

 cent age (in question) 20 



(unconformity) 

 11. Centinella gravels- with warmer- water, 

 marine fossils (Tieje). Exposed on ocean 

 side of Dominguez Range (R. T. H.). 

 10. Boulders, unconsolidated river materials. . 1-20 

 (unconformity) 

 9. Bluish fresh-water clays La Brea Stage'' 

 (5) alternating with micaceous sands and 

 river gravels. Blue clay No. 2 with sloth 



remains 300 



8. Unfossiliferous sands 150 



'Bulletin A. A. Pet. Geolcttists, p. 505. 



-On page 510 Tieje states that 70 feet of strata largely marine sands and 

 gravel lie stratigraphically above the youngest blue clays (No. 9) of Trench 

 10. These he called the "Centinella Gravels." 



