Sections

Ecological Land Types within LTA 118.

ELT 118a

Elevation Range
Minimum: 
757 m
Minimum in ft: 
2482 ft
Maximum: 
1002 m
Maximum in ft: 
3286 ft
Median: 
845 m
Median in ft: 
2772 ft
Soil Summary: 
very deep; very gravelly clay loam, gravelly sandy loam, and very gravelly sandy loam surface layers over gravelly, very gravelly and extremely gravelly sandy loam, gravelly and very gravelly sandy clay loam subsurface layers; lime depth ranges from the surface to more than a foot below the soil surface; no to modest development (lime and clay accumulation); dominated by Pima County soil survey map units 61 (Pinaleno-Stagecoach-Palos Verdes complex, 10 to 35 percent slopes) and 60 (Pinaleno-Stagecoach complex, 5 to 16 percent slopes). These units comprise 67 and 31% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with the Rillito Formation (Ts1) and sandstone, siltstone and conglomerate, undivided (QTs) which comprise 69% and 20% of the unit, respectively
Landforms: 
moderately to finely dissected, moderately to deeply incised fan and pediment surfaces

ELT 118b

Elevation Range
Minimum: 
785 m
Minimum in ft: 
2576 ft
Maximum: 
844 m
Maximum in ft: 
2769 ft
Median: 
816 m
Median in ft: 
2677 ft
Soil Summary: 
a major component is associated with granite or granite-like rocks and are shallow or moderately deep to bedrock, very to extremely gravelly with varying depth to lime deposits, and have moderate development (lime and subsoil clay accumulation); other dominant soils are very deep; very gravelly clay loam, gravelly sandy loam, and very gravelly and very cobbly sandy loam surface layers over gravelly, very gravelly and extremely gravelly sandy loam, gravelly and very gravelly sandy clay loam subsurface layers; lime depth ranges from the surface to more than a foot below the soil surface; no to modest development (lime and clay accumulation); dominated by Pima County soil survey map units 58 (Pantano-Granolite complex, 5 to 25 percent slopes), 54 (Palos Verde-Jaynes complex, 2 to 8 percent slopes) and 60 (Pinaleno-Stagecoach complex, 5 to 16 percent slopes). These units comprise 53, 34 and 21% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with an unnamed unit (Tco); the Rillito Formation (Ts1); sandstone, siltstone and conglomerate, undivided (QTs); and early to late Pleistocene alluvium (Qi2, Qi3) which comprise 54%, 36% and 8% of the unit, respectively
Landforms: 
undissected to coarsely dissected, weakly incised fan and pediment surfaces

ELT 118c

Elevation Range
Minimum: 
802 m
Minimum in ft: 
2630 ft
Maximum: 
917 m
Maximum in ft: 
3010 ft
Median: 
836 m
Median in ft: 
2743 ft
Soil Summary: 
very deep; very gravelly clay loam, gravelly sandy loam, and very gravelly sandy loam surface layers over gravelly, very gravelly and extremely gravelly sandy loam, gravelly and very gravelly sandy clay loam subsurface layers; lime depth ranges from the surface to more than a foot below the soil surface; no to modest development (lime and clay accumulation); dominated by Pima County soil survey map units 60 (Pinaleno-Stagecoach complex, 5 to 16 percent slopes), 54 (Palos Verde-Jaynes complex, 2 to 8 percent slopes) and 61 (Pinaleno-Stagecoach-Palos Verdes complex, 10 to 35 percent slopes. These units comprise 47, 31, and 8% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with early Pleistocene piedmont deposits (Qo); the Rillito Formation (Ts); late to latest Pleistocene alluvium (Qi3); Pantano Formation (Tp); and Holocene to Pleistocene alluvium, undivided (Qy1) which comprise 46%, 21%, 12% and 11% and 5% of the unit, respectively
Landforms: 
undissected to coarsely dissected, weakly to moderately incised fan and pediment surfaces

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