82 



H. E. Gregory — A Geologic Reconnaissance 



Feet. 



Adobe, dark red, massive, highly calcareous, with lenses 

 of fine and of coarse gravel ; abundant vertical root 

 tubes and rare shells 6 



Unconformity. 



Fig. 39. 



3&£fc|g51 





Fig. 39. Section of San Sebastian formation near the Cuzco railway 

 station. Contains adobe sand, fossiliferous limestone and gravel. Hiram 

 Bingham, photo. 



5. Sand, fine, yellow at top ; with gravel of flat fragments ; 



upper surface channeled ; vertical root tubes ; rare 

 shells 4 



6. Adobe, dark red, massive, firm, calcareous; with small 



lenses and masses of fine gravel 10 



Unconformity. 



