1911.] 



NATURAL SCIENCES OF PHILADELPHIA. 



175 



and well worth investigation 

 on these two trails, both of 

 which are easily accessible. 



In 1909 (August 19 to Octo- 

 ber 25) Messrs. Ferriss and L. 

 E. Daniels extended the work 

 to the region north of the Grand 

 Canyon, exploring the Powell 

 Plateau and the western side 

 of the Kaibab Plateau, going 

 as far north as Kanab, Utah. 

 A long and hard trip was also 

 made westward to Mt. Trum- 

 bull. The route and stations 

 are partly shown in fig. 2. The 

 northward extension of the 

 route, to Fredonia, Ariz. (Sta- 

 tion 38), and Kanab, Utah, is 

 not shown on the map. From 

 Fredonia the route led south- 

 west to Pipe Spring, Vermillion 

 Cliff (Station 39), to Yellow- 

 stone Spring, southward across 

 Antelope Valley (Station 40), 

 to Mt. Trumbull, where the fol- 

 lowing stations were occupied : 



43, Base of northwestern part 

 of mountain, 6,700 feet. 



44, Spring at northwestern 

 part of mountain, 7,000 feet. 



45, Northwestern part of 

 mountain, 6,700 feet. 



46, Hurricane Fault, 8 miles 

 from Mt. Trumbull, 6,000 feet. 



Station 41 is close to the 

 figure 6, on the Kaibab Sheet 



Fig. 2. — Part of route and collecting 

 stations, expedition of 1909, north 

 of the Grand Canyon. 1000 ft. 

 contours traced from U. S. Geol. 

 Surv. topographic map, Kaibab 

 sheet, edition of March, 1886, re- 

 printed January, 1900. 



