F. B. Loomis — Origin of the Wasatch Deposits. 359 



169 rd 



{mile 



On the other hand, the presence of crocodiles, aquatic tur- 

 tles and fishes in numbers sufficient to make up ten per cent of 

 the whole fauna would be very remarkable in a land deposit 

 (seolian for example). More or less water is necessary to 

 account for the appearance of these animals. The mode of 

 deposition, therefore, which would account for their presence, 

 together with large numbers of terrestrial forms, would be 

 that of flood plains. Further, just such deposits might be 

 expected where the streams debouch from recently formed 



