﻿46 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



6012. — Oligacene — Culehra formation. 



From section — west side of Gaillard Cut. 



a. Dark, well laminated soft and very friable carbonaceous shale. 



Few foraminifera — some glauconitic, others well preserved. 



c. From a lens of sandy limestone 5 feet thick. 



Few foraminifera — some stained, some glauconitic, rather poorly 

 preserved as to details. 



d. From lenses of limy sandstone at base of gravel, 3 feet thick. 

 Few foraminifera and these poorly preserved. 



6016. — Oligocene — Emf evador Imiestone. 



From old quarry, one-fourth mile north of west from Empire. 



Cream-colored, coral limestone. 



Few foraminifera. 

 6016. — Oligocene — Emjyerador limestone. 



From old quarry, one-third mile north of west of Empire. 



Few poorly preserved foram-inifera. 

 6019. — Section on west side of Gaillard Cut near Las Cascadas. 



a-f. Oligocene — Cidehra formation. 



a. Grayish, rather nodular, impure limestone. 



Foraminifera few and poor. 



h. Dark, well stratified, very friable, tufaceous material. 



Foraminifera few and poor except OrMtolites, which are large 

 and fine. 



G. Grayish, well stratified, very friable, tufaceous sandstone. 



Few casts of foraminifera and central portions of orbitoids. 



d. Grayish-green, limy, tufaceous sandstone. 

 Very few foraminifera, poor specimens. 



e. Thin-bedded, light gray to cream-colored, limy sandstone with 

 some partings of light-colored clay. 



orbitoids and Orhitolites? only. 



/. Dark, very friable shales and tuffs. 



Foraminifera fairly common, some well preserved, others glau- 

 conitic. 



g. Oligocene — Emferador limestone. 



Light gray to yellowish gray, somewhat sandy limestone. 



Some orbitoids and OrMtolitesf but little else in the way of 

 foraminifera. 

 6020. — Oligocene — Culehra formation. 



Same locality as 6019. 



a;-c. Dark-gray carbonaceous clays, friable shales and tuffs. 



a. Foraminifera numerous but of few species, mostly glauconitic, 

 at least in part. 



c. A few Orhitolites in the coralliferous layer. 



