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returned north to Cottonwood Pass, stopped for two hours at 7800 feet on the west side of the pass and then continued on to Crystal where camp was made for the night. On July 4 we continued on, making a second brief examination of Red Lake and camped at waterholes in an arroyo east of the rock formation known as the Haystacks, 8 miles east of Fort Defiance, Arizona and within the New Mexico boundary line. On July 5 we continued to Gallup, New Mexico.

PHYSIOGRAPHY AND GENERAL ACCOUNT.

The Chusca Mountains lie in northwestern New Mexico near the Arizona line and are included within the limits of the Navajo Indiana Reservation. The part of this mountain range covered in the present report extends from Cottonwood Pass six miles north of Crystal New Mexico south to the southern end of the range. (The wagan road that crosses at Cottonwood Pass is not shown on the Geological Survey sheets.) The summit of the mountains here is a great undulating mesa that lies in the main at 8800 feet above sea level with points at intervals rising to 9000 feet. The position of this mesa examined in the present connection comprises an area about 15 miles long and from one to three miles broad. The mountain extends in a general way from northwest to southeast.

The underlying rock of the summit of the mesa is a fine-grained light colored sandstone that where exposed breaks readily into thin slabs from half an inch to two inches thick. The beds of this sandstone have a dip of about 30 degrees to the northwest while the strata are tilted somewhat to the east. This formation forms low ridges running in general across the mesa from east to west with lower areas between, the surfaces of which are diversified by many hollows of varying size. These hollows form the