108 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
PAGE PAGE 
Stage of meer aary of the Relation of the Esplanade to 
Canyon. 9-) - awe LOS the Toroweap Fault . . . 184 
Rapids in the ace On. 8 ie 168 Conclusion as to the Origin of 
Junction of Trunk and Branch the Esplanade .. . 185 
Streams. . . 169} Hints for a Visit to the Ganson 186 
The Geological Bection in the Former Climates of the Grand Can- 
CanyonsWalliy 0. ue ese yon District . .-. 187 
The Two Unconformities . . 173| Diverse Opinions of Early Ob- 
Correlation of Water Streams SCEVCrS eso) & 187 
and Waste Streams .. . 176 Moist Miocene gad na Plio- 
Cirques, Cusps, and Niches . 178 cene Climates ... . . 188 
The Esplanade. . . . 180| The Toroweap. . 189 
Two Theories atthe lesp|pnade 181} The Pluvial Raniealent of the 
Comparison of the Kaibab and Glacial Period . . , . . 192 
the Kanab Sections . . . 181] Volcanic Phenomena . ... . 192 
Eastward Fading of the Es- Surmary® “i. 0<c. 3 ek eee eos 
planade. .. . 182) Bibliography ..:..._ .\ 4.4, ea oe 
Relation of the Inner “a pa Explanation of Plates... . . 201 
Canyonstinet-uchecm cll aos 
Introduction. 
In June, 1900, it became possible for me to visit the district of the 
Grand Canyon of the Colorado, and to see upon the ground the wonder- 
ful features of a region that had long been familiar from the reports 
of our governmental surveys. Our party consisted of Prof. R. E. 
Dodge of Teachers’ College, Columbia University, Prof. H. E. Gregory of 
Yale University, Mr. R. L. Barrett of Chicago, Mr. Richard Wetherill 
of Pueblo Bonito, N. M., Dr. Tempest Anderson of York, England, and 
the writer. We reached Flagstaff, Arizona, by the Santa Fe Western 
Railroad on June 3, spent twenty-three days travelling irregularly across 
country, and went out from Milford, Utah, to Salt Lake City by a 
branch of the Oregon Short Line on June 26. Our itinerary is shown 
on the accompanying outline map, Figure 1, with dates of camps, and 
in the list of camps given below. We travelled partly in wagon, partly 
on horseback, and averaged about twenty-five miles a day. The clouds 
of thunder showers were frequently seen in the distance, but we had 
rain only twice; first a few drops in the canyon, June 7, and next a 
brisk shower near the Little Colorado crossing on the morning of June 
10; the centre of this shower passed north of us, and the muddy 
streams from its short-lived down-pour met us as we were ascending 
a dry arroyo, or ‘‘wady.” Many days were almost cloudless and 
oppressively hot over noon. The nights were cool, with the exception 
ae 
