358 F. B. Loomis — Origin of the Wasatch Deposits. 



Lower Higher 



level level 



Tatrnan Tatrnan Buffalo 



Mt. Mt. Basin Total 

 Lizards : 



Terrestrial : 



Gly]:>tosaurus obtusidens.. .. 4 ._ 4 



Crocodiles : 

 Aquatic: 



Crocodilus heterodon 4 4 



" wheeleri _ 6 8 2 '.. 



" liodon 1 2 1 



Diplocynodus sphenops 1 .. .. 29 



Turtles : 



Aquatic: 



Trionyx leptomitus 1 4 



" scutumantiquum .1 2 



" . Sp. ? . _ . . 2 . . ; 



Plastomenus fractus .. 1 1 1 



communis 1 2 



" corrugatus ; . . . . 1 



Emys euthneta 2 2 ] 22 



Fishes : 



Aquatic : 



Lepidosteus integer 2 4 1 



Vertebrae indet. ? .... 1 1 __ 9 



2 beds of Unio 2 



2 beds of Cerithium sp. ? 1 1 



Summary: 151 303 34 488 ^"^i-^ 



Aereal, 3, 



Terrestrial and arboreal, 375 or 77 per cent 

 Amphibious, 60 or 12 per cent 

 Aquatic, 50 or 10 per cent. 



In a lake basin land forms would be expected to be washed 

 in, making possibly from ten per cent to fifteen per cent of 

 the total number of individuals. However, strictly aquatic 

 forms should predominate, and where conditions were such as 

 to preserve bones and teeth, invertebrates, also, in the form of 

 shells would be generally distributed. In the Wasatch beds, 

 fish remains were especially sought, but the number of these, 

 including single vertebrae, is far below what would be a fair 

 proportion in a lake basin. While Eohippus, the predominant 

 form, is typical of plains or open country, the remains of this 

 genus alone make up 32 per cent of the total fauna, 77 per 

 cent of the latter being land animals, a proportion so large as 

 to preclude the possibility of attributing it to such a deposit. 



