1923] EDWARDS, SECOND SEASON AT GRAND CANYON 47 



any of our dances are performed alone, but practically all of the In- 

 dian dances are done each man by himself and each woman by herself. 

 Let him without sin cast the first stone. 



A SECOND SEASON AT THE GRAND CANYON, 



ARIZONA 



By Ira Edwards*' 



During the past year, the Department of Geology started work up- 

 on a group depicting the Grand Canyon of the Colorado river, in 

 northern Arizona. As far as possible, the necessary fieldwork was 

 completed during that year and has been described in two articles^ 

 published in the 1922 Yearbook. The completion of the undertaking 

 required further fieldwork, which occupied six weeks of the present 

 year. The Atchison, Topeka and Santa Fe Railroad and the Fred 

 Harvey Company, Inc. continued their cooperation during this second 

 season, thereby greatly aiding in the success of the undertaking. 



The work upon the south rim of the can3'on had been very nearly 

 finished, and we were in possession of those photographs and sketches 

 which could be obtained from the points most easil}' reached from the 

 hotel. The object of this year's expedition, was to penetrate still 

 farther into the canyon, and to add to our collections, those fossils, 

 minerals and rocks which occur, only far below the rim or upon the 

 north side of the river. We also desired to take as many photographs 

 as possible, and, in general, to gather all the data available concerning 

 the rocks, the structure and the scenery of this wonderful work of 

 erosion. To do this, it was planned to cross the canyon to the north 

 rim and then travel on the plateau existing there, to certain prominent 

 points from which typical views of the region could be obtained. A 

 journey along the Tonto platform which lies in the interior of the can- 

 yon at a depth of three thousand feet was also planned which would 

 afford an opportunity to examine the rocks making up the lower por- 

 tion of the canyon wall and to take many unusual photographs of the 

 river and of the huge temples and mesas which are found within the 

 canyon. This was all accomplished on one long trip, starting from 

 El Tovar hotel and descending into the canyon by way of Hermit 

 trail. Once within the canyon walls, the route ran along the Tonto 

 platform, across the river, up Bright Angel canyon to the north rim 

 and finally back by way of Bright Angel trail. Such a trip required 



'Curator of Geology, Milwaukee Public Museum. 



'Ira Edwards, "Geological Fieldwork at the Grand Canyon, Arizona," Milwaukee Public Museum 

 Yearbook, Vol. II, pp. 89—113, 1923. 



S. A. Barrett, "A Trip to Cave Hill, Arizona," Milwaukee Public Museum Yearbook, Vol II pp 

 176—182, 1923. 



