Gilmore 1926 El Cayon Canyon, 3600 ft. E. base San Pedro Mts. Lower Calif. Mexico. May 13. Arrived here at 4:30 P.M. after a continuous ride since 7:30 A.M. The trail from Alcatraz to Santa Rosa Valley was good but after that it was very bad. The trail about 2 miles out south east of Vallo de Santa Rosa dropped down a steep rocky canyon and contin- ued to do so thru Canyon after Canyon. for about 10 miles. From the top of the ridge one could look over 10-16 miles of terrificaly rough mts, over a long narrow desert, over the San Felipe mts to the blue waters of the Gulf. The camp at El Cayon is located among some mezquite trees at the edge of a good stream. On either side precipitous canyon walls rise 6 for several thousand ft. The place seems to be a good mountain sheep habitat but none have been seen. A few mice or rats were seen in the mezquite trees and among the rocks.