Page 10 - flint1939

5.

part of the area. Other resistant beds also tend to form

ridges, but the ash are the most prominent.

The streams are mostly in a youthful stage with steep

'V' shaDed canyons. In the soft Mint Canyon formation the

streams cut downward very ra,)idly and then reach grade giving

them a concentration of grade near their heads. Plum Creek

in its upper reaches hes a concave profile due to the old land

surface on which it originates and which it follows for a

distance.

DRAINAGE

The northern part of the area drains westward into Bou-

quet Canyon which in this place has a southwest drainage.

The extreme northeastern tip of the area drains into Mint

Canyon. The southern portion of the area. drains into ?lum

Creek which originates on the Dlateau to the north and soon

cuts itself a course first south, then west to join Bouquet

Canyon. The 'i\Testward running Dortion of Plum Oanyon and Bou-

quet Canyon are wide canyons filled with alluvial-material as

is common in semi-arid regions. The streams, intermittant in

type, become raging torrents in the rainy season, and soon

Dick uu a full load of detritus in their steeuest parts. On

reaching the graded section the stream drops much of this

material giving rise to an alluvial de~osit in its valley

which is alternately cut and filled as the stream swings across

it-. For the time being both lum and Bouquet Canyons are
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