552 Emery — Green River Desert Section, Utah. 



ver and Eio Grande Railroad, Dirty Devil River, San 

 Rafael Reef, and the canyon of Green River (fig. 1). 

 The rocks exposed in the Desert range in age from Penn- 



FlG. 1. 



rNDEX MAP 



sylvanian (?) to Upper Cretaceous and embrace a thick 

 series of sandstones with some shale and a very little 

 limestone. The oldest bed examined was a white sand- 

 stone of Pennsylvanian ( ?■) age which is extremely cross- 

 bedded and is saturated with petroleum. Above it lies, 

 probably unconformably, the Moenkopi formation (here 



