TDE WASATCH FAUNA. 
273 
tliat Professor Lesqnereux enumerates it among the “Paleocene” beds in 
liis list* of horizons containing the European fossil Tertiary flora. Whether 
the distinction between Eocene and Paleocene be well marked in paleo¬ 
botany I do not know; but the Suessonian and other Eocene beds are not 
very widely separated by their faunse. Nevertheless, the Suessonian beds 
of Europe are placed by Professor Lesquereux in the Paleocene by their 
flora, while their horizontal parallels in North America are placed in the 
later Miocene. It would appear that there is another, perhaps geographical, 
discrepancy in this case. 
The teeth of Sharks described in the preceding pages are of uncertain 
origin. They are associated with Oyster-shells, and both have the appear¬ 
ance of having been transported ; nevertheless, some of the Mammalian 
teeth found associated with them have a similarly rolled appearance. It 
therefore remains uncertain whether the ocean had for a limited time access 
to the Eocene lake, or whether the Sharks’ teeth and Ostrece were derived 
from the Cretaceous beds which formed its shores. Similar, and in one 
instance the same, species of Sharks were found in both formations; the 
division of the Cretaceous being No. 4, or 3 of Hayden. 
The same state of things exists in the siderolitic deposits of the canton 
of Vaud, Switzerland. Mingled with Mammalian remains are teeth of 
Sharks, of which M. La Harpe remarks that their appearance does not war¬ 
rant the belief that they have been transported, or are not indigenous to 
the Eocene fauna. 
In conclusion, the classification of the North American Eocene may be 
represented as follows: 
Name. 
Equivalent. 
Locality. 
Characteristic fossils. 
f 
Palmosyops. 
Bridger formation- 
Middle Eocene.. 
Southwestern Wyoming..j 
\ 
Tillodonta. 
Dinocerata,. 
Pantodonta. 
Toeniodonta. 
Wasatch formation ... 
Lower Eocene .. 
Northeastern New Mexico; Southwestern Wyoming.. | 
Phenacodus. 
Diatryma. 
II. The structural characteristics of the Wasatch fauna .—The general 
statement of the character of this fauna is found in the classified list at the 
* Ami. Eept. U. S. Geol. Surv. Terrs., 1874, p. 285. 
18 G R 
