100 Gregory — Igneous Origin of the " Glacial Deposits " 



Fig. l. 



LATITUDE 37° 13' APPROXIMATE 



Scale of Miles 

 Contour interval 200 feet 



Fig. 1. Map of a portion of northern Arizona and southern Utah, show- 

 ing the location of fields of erratic bowlders. Base compiled mainly from 

 reconnaissance topographic sheets of the United States Geological Survey, 

 and from Map of the San Juan Oil Field by E. G. Woodruff. The dissected 

 ridge extending southward through Mules Ear, Moses Eock and Garnet 

 Eidge is the Comb Monocline ; Monument Valley extends westward beyond 

 Gypsum Creek. Since the preparation of this map the spelling of Chinli 

 has been changed by official action to Chinle and of Kayenta to Tyende. 



