Plate 15.—These two terrain types are superficially similar, but their differences in vegetation 
make them distinctive. They each have a narrow range of associations usually found on them only. 
COLORADO PLATEAD 
HIGH PLATEAD TYPE 
COLORADO PLATEAU 
LOW PLATEAU TYPE 
UTTtfe COLOBAOO RIVER 
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Pig. 2.18 High plateau type. This sandstone plateau, at an 
elevation of 8,000 ft., Is heavily forested with high qual 
ity pine timber. The escarpment in the foreground Is the 
Uogollon Rim which forms the south boundary of the province. 
The local climate Is temperate with warm summers and moderate 
winters. Thunderstorms provide considerable rain in summer 
and there are heavy snows In winter. There Is a network of 
poor roads, which are being developed into high standard log 
ging roads as the virgin timber receives its first cut. The 
plateau is very sparsely populated, but a few small settle 
ments may be found, such as logging camps, summer ranch head 
quarters, ranger stations and small communities subsisting on 
a combination of dry farming, livestock raising and sawmill 
work. Near Showlow, Arizona. October 1949. 
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IRRIGATION BASIN 
LOW PLATEAU ' 
Fig. 2.19 Low plateau type. This 7,000 foot plateau has a 
vegetation cover of plnon-Juniper woodland and open grass 
land. Plnon and juniper are short and crooked and are usu 
ally used for fuel wood and fence posts. The grasslands 
provide spring and fall range and occasionally winter range. 
Thi» type of land has an adobe clay soil and Is occasionally 
plowed for planting range grasses or for dry farming. The 
local climate is a transition between temperate end semi- 
desert. Enow does not last after winter storms and light 
rains may be expected from July to September. Precipitation 
averages 15" - 20", but is erratic. The plateaus may be 
crossed on the rut roads used by wood haulers or on low 
standard farm roads. Near Delta, Colorado. October 1647. 
PHOTOGRAMMETRIC ENGINEERING GVII-99