Page 20 - flint1939

15.

OLD ALLUVIUM
•
This material is the detritus of the Saugus and Mint

Canyon formations in the earlier erosional cycle. It is pres-

ent on the broad sloping hillsides north of Plum Canyon and on

the toD of the raised closed basin on the eastern boundary of

the area. It is present in other places in the area but the

Plate VI The old land surface on the flats

at the head of Plum Canyon

occurences are either too small or too uncertain to map •. On

the table °land the alluvium was denosited on the beveled edges

of the Mint Canyon and then most of it was stripped off leav-

ing only the bottom layers and a well developed zone of caliche
/
just below the surface. Through some deformation attendent on

the uplift of the area this was made into a small perched basin

which occupies the divide between Bouquet and Mint Canyons.