PEALE.J GEOLOGICAL FORMATIONS GREEN RIVER TERTIARY. 185 



Myrica latiloha, Heer. , 



Fraxinus prcedicia, Heer. 

 Myrica acuminata, Ung. 

 Sapindus angustifolia, Lesqx. 

 Myrica Gopeana, Lesqx. 

 Spicifer buds of Equisetum. 

 From layer Xo. 4 the following were obtained : 

 Planera longifolia. 

 JSpicifer buds of Equisetum. 



At camp 37, near Station 27, the cliffs were again found to be fossil- 

 iferous. 

 The following is the section : 



Top. 



1. Limestone, white and crystalline shales. 



2. Greenish-gray sandstone with fossils No. 4. ' 



3. Dark argillaceous shales with fossils Ko. 3. These fossils are about 

 10 feet below Ko. 1. 



4. White shales to base of cliffs. 

 Fossils No. 3 are the following : 

 Myrica latiloba, Heer. 

 Myrica acuminata, Ung. 

 Sapindus angusiifolia^ Lesqx. 

 Sapindus ? 



Ilex affinis, Lesqx. 



Stem of Equisetum. 



Crushed feathers! or hairs. 



Fossils No. 4 are — 



Myrica latiloba, Heer. 



Myrica acuminata, Ung. 



Sapindus angustifolia. 



Myrica undulata, Lesqx. 



For these identiflcations I am indebted to the kindness of Professor 

 Lesquereux, to whom the specimens were submitted. Professor Les- 

 quereux says: "All the specimens represented from No. 1 to No. 4 show 

 evidently the same formation, that of the Green River group, or Mio- 

 cene, as it is represented at Elko Station, Middle, and especially South 

 Park, &c. I have specimens of most of the species indicated in your 

 table from the localities here named, Florissant, Castello Ranch, &c. 

 The small cones, spicifer buds of Equisetum, are very fine and new.'' 



The following is a general' section of the Green River group in the 

 cliffs east of Station 27. It does not include the entire thickness, as a 

 portion of the upper beds has been removed by erosion. 



Section. 

 Top. Feet. 



1. Indurated argillaceous, arenaceous, and calcareous shales,"} 



with thin bands of limestone near the top. These shales j 

 weather white, but when broken are generally dark inside. | 



2. Rusty colored sandstones with interlaminated shales ....... J> 1,600 



3. Thin greenish argillaceous shales, with bands of laminated j 



sandstone | 



4. Rusty laminated sandstones \ 



This thickness was measured with an aneroid barometer. The section 

 at White Mountain is given in the table on p. 183. 



It is in bed No. 1, of the section just given, that fossils Nos. 3 and 4 

 were obtained. 



