Sections

Ecological Land Types within LTA 170.

ELT 170a

Area: 
3127 ha
Area in acres: 
7729 acres
Elevation Range
Minimum: 
924 m
Minimum in ft: 
3031 ft
Maximum: 
1136 m
Maximum in ft: 
3728 ft
Median: 
1002 m
Median in ft: 
3287 ft
Soil Summary: 
very deep, very gravelly and gravelly clay loams, clays, and sandy loams, lime throughout or prevalent at a shallow depth, well developed; also included are very deep sandy loam soils associated with washes and recent alluvial terraces, these soils have little or no development and lack lime in the upper soil layers; dominated by Pima County soil survey map units 6 (Bernardino-Tombstone association, 5 to 16 percent slopes), 79 (Tombstone very gravelly loam, 15 to 50 percent slopes), and 19 (Comoro sandy loam, 0 to2 percent slopes)
Geologic Materials: 
alluvium and residuum associated with Quaternary and Tertiary sandstone, siltstone and conglomerate, undivided (QTs) and Holocene piedmont alluvium (Qy) which comprise 90% and 9% of the unit, respectively
Landforms: 
finely dissected, weakly to moderately incised fan and pediment surfaces

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

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