Geology of Ft. Apache Region, Ariz. — Reagan. 283 
tiary showed that a great part of it came from the White 
Mountain district, because in it are many boulders of the trach- 
yte type which could not have come from any other location 
within hundreds of miles of the place. It is true that there are 
other trachyte lavas nearly as close to Seven-Mile Hill canyon 
as that in the White mountains, but they are at a lower level 
than these deposits, and of course could not contribute to their 
make-up. Again the depositing dip of the clays and sands and 
the increasing coarseness of the debris as the mountains are 
approached aid in verifying the theory that the material came 
from the mountains to the east. 
The Quaternary on the Cibicu divide indicates by its com- 
position that it came from the west and northwest ; it is com- 
posed of quartzyte, gneiss and vitreous Tonto sandstone bould- 
ers, which, without doubt, came from the worn off edges of the 
Canyon Creek escarpment, from which at least 3000 feet of 
rock in vertical section has been removed. 
The Hinton and Salt river deposits were laid down by the 
streams which now flow through them — Cherry creek, Salt 
river, and Canyon creek. The sediments are debris gathered 
from surrounding mesas. They are mostly ground up Arch- 
aean and Palaeozoic rocks, taken from the upper and middle 
valleys of Cherry and Canyon creeks. The biotite granite 
particles are easily traced to the middle Canyon creek and up- 
per Oak creek region. 
The sediments of Chiddessky, Ellison flat, middle Cherry 
creek and Globe formations are the result of the denudation of 
the hills, mesas and mountains in the immediate vicinity of 
each. 
In concluding the discussion of the Quaternary and Ter- 
tiary the writer wishes to state that it is probable that some of 
the debris came from the mountains to the north, from the 
mountains beyond the Colorado Chiquito. 
The Post-Glacial — After the deposition of the sediments 
just considered, lava flow periods and periods of denudation 
alternated with each other three times in succession, then a pe- 
riod of deposition set in in which sediments were laid down in 
the inner valleys to a thickness of several hundred feet in some 
places. These deposits are the valley farm lands of today. 
