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

Land Type Association: LTA 170

Ecological Unit: Mesquite grasslands on fans, terraces, and weakly consolidated pediments of various parent materials

Map with the ELT 170b polygon highlighted.

Landform position classes and corresponding vegetation*

Landform Class	Area	Percentage of ELT	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