THE 



AMERICAN JOURNAL OF SCIENCE 



[FOURTH SERIES.] 



Art. XXIII. — The Green River Desert Section, Utah;* 

 by Wilson B. Emery. 



General Statement. 



The charm of the Southwest and of its geology ever 

 lingers with me, and so it was with considerable pleasure 

 that in 1917 I again undertook work in this region for the 

 U. S. Geological Survey, after several seasons spent else- 

 where. The examination in hand, which was a recon- 

 naissance to determine the oil possibilities of the Green 

 River Desert, Utah, necessitated a more or less detailed 

 study of the stratigraphy of the area, and it is the results 

 of this phase of the investigation that I shall present in 

 the following pages. These results constitute further 

 evidence of the remarkable similarity in lithologic char- 

 acter and stratigraphic sequence of the thick series of 

 sedimentary beds exposed broadly over the vast area 

 of the Colorado Plateaus. Very frequent comparison 

 will be made with the rocks of the Navajo Country in the 

 southern Colorado Plateaus, for it is with the stratig- 

 raphy of this region, embracing many hundred square 

 miles in southern Utah, northern Arizona, and north- 

 western New Mexico, that I have first-hand knowledge, 

 acquired during a long field season in 1913, while assist- 

 ant to Professor Herbert E. Gregory, in his studies there 

 for the United States Geological Survey. 



Green River Desert is situated in east-central Utah 

 and embraces that portion of the Colorado Plateaus 

 which is in Emery and Wayne counties, between the Den- 



* Published by permission of the Director, XL S. Geol. Survey. 



Am. Jour. Sci.— Fourth Series, Vol. XL VI, No. 274.— October, 1918. 

 23 



