Ecological Land Type

ELT 170b

Area: 
573 ha
Area in acres: 
1417 acres
Elevation Range
Minimum: 
1048 m
Minimum in ft: 
3437 ft
Maximum: 
1186 m
Maximum in ft: 
3891 ft
Median: 
1115 m
Median in ft: 
3658 ft
Soil Summary: 
very deep, gravelly and very gravelly clay loams and sandy loams, devoid of lime,well developed (clay accumulation); dominated by Pima County soil survey map unit 10 (Caralampi extremely gravelly sandy loam, 15 to 45 percent slopes) which comprises 99 percent of the ELT
Geologic Materials: 
alluvium and residuum associated with Quaternary and Tertiary sandstone, siltstone and conglomerate, undivided (QTs) which comprises 98% of the unit
Landforms: 
finely dissected, deeply incised fan and pediment surfaces

Map with the ELT 170b polygon highlighted.Photo Point 014

Landform position classes and corresponding vegetation*

Landform Class Area Percentage of ELTsort icon Vegetation and notes
moderately dry steep slopes 19 ha 3

grasses, sotol (Dasylirion), Yucca elata, beargrass

moderately moist steep slopes 21 ha 4

grasses, sotol (Dasylirion),Yucca elata, beargrass, with mesquite

toe slopes, bottoms, and swales 29 ha 5

grasses, sotol (Dasylirion),Yucca elata, beargrass, with mesquite

gently sloping ridges and hills 496 ha 87

grasses, sotol (Dasylirion), Yucca elata, beargrass