Sections

Ecological Land Types within LTA 8.

ELT 8a

Elevation Range
Minimum: 
882 m
Minimum in ft: 
2894 ft
Maximum: 
1040 m
Maximum in ft: 
3413 ft
Median: 
941 m
Median in ft: 
3087 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 Verdes-Jaynes complex, 2 to 8 percent slopes), 62 (Pinaleno very cobbly sandy loam, 1 to 8 percent slopes), and 61 (Pinaleno-Stagecoach complex, 10 to 35 percent slopes). These units comprise 33, 24, 20 and 16% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with Pleistocene piedmont alluvium (Qi2, Qi, Qi1, Qi1r, Qi2r, Qi3, Qy), sandstone, siltstone, and conglomerate, undivided (QTs), Pliocene to early Pleistocene river deposits (QTsr), Pleistocene river terraces (Qir, Qy2), old alluvium (QTs), and small areas of rock exposure (mostly granodiorite) which comprise 59%, 17%, 16%, 4%, 2%, 1% and 3% of the unit, respectively
Landforms: 
coarsely to moderately dissected, moderately incised fan and pediment surfaces

ELT 8b

Elevation Range
Minimum: 
905 m
Minimum in ft: 
2968 ft
Maximum: 
964 m
Maximum in ft: 
3164 ft
Median: 
929 m
Median in ft: 
3048 ft
Soil Summary: 
very deep; very gravelly clay loam and very gravelly sandy loam surface layers over gravelly, very gravelly and extremely gravelly sandy loam, gravelly and very gravelly clay loam subsurface layers; lime at or near the soil surface; modest development (lime and clay accumulation); dominated by Pima County soil survey map units 60 (Pinaleno-Stagecoach complex, 5 to 16 percent slopes) and 61 (Pinaleno-Stagecoach complex, 10 to 35 percent slopes). These units comprise 49 and 41% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with sandstone, siltstone, and conglomerate, undivided (QTs), Pleistocene piedmont alluvium (Qi2, Qi, Qi1, Qi1r, Qi2r, Qi3, Qy), and Pantano Formation (Tp) which comprise 44%, 35% and 19% of the unit, respectively
Landforms: 
finely dissected, weakly to moderately incised fan and pediment surfaces

ELT 8c

Elevation Range
Minimum: 
864 m
Minimum in ft: 
2834 ft
Maximum: 
951 m
Maximum in ft: 
3119 ft
Median: 
903 m
Median in ft: 
2963 ft
Soil Summary: 
very deep; very gravelly clay loam and very gravelly sandy loam surface layers over gravelly, very gravelly and extremely gravelly sandy loam, gravelly and very gravelly clay loam subsurface layers; lime at or near the soil surface; modest development (lime and clay accumulation); dominated by Pima County soil survey map units 61 (Pinaleno-Stagecoach complex, 10 to 35 percent slopes) and 60 (Pinaleno-Stagecoach complex, 5 to 16 percent slopes). These units comprise 70% and 15% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with Pleistocene piedmont alluvium (Qi2, Qi, Qi1, Qi1r, Qi2r, Qi3, Qy), Pleistocene river terraces (Qir, Qy2), old alluvium (QTs), sandstone, siltstone, and conglomerate, undivided (QTs), and small areas of rock exposure (mostly granodiorite) which comprise 84%, 1%, 10%, 4% and 1% of the unit, respectively
Landforms: 
moderately to finely dissected, weakly to moderately incised fan and pediment surfaces

ELT 8d

Elevation Range
Minimum: 
926 m
Minimum in ft: 
3039 ft
Maximum: 
1062 m
Maximum in ft: 
3483 ft
Median: 
977 m
Median in ft: 
3205 ft
Soil Summary: 
very deep; fine sandy loam surface soils over gravelly clay and gravelly sandy clay loam subsoils and very gravelly fine sandy loam or sandy loam surface soils over mostly fine sandy loam, loam and clay loam subsurface layers; lime depth ranges from the surface to several feet deep; weak to strong development (clay accumulation) dominated by Pima County soil survey map units 81 (Tubac gravelly loam, 1 to 8 percent slopes), 72 (Sahuarita soils, Mohave soils and Urban land, 1 to 5 percent slopes). These units comprise 60% and 18% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with Pleistocene piedmont alluvium (Qi2, Qi, Qi1, Qi1r, Qi2r, Qi3, Qy), sandstone, siltstone, and conglomerate, undivided (QTs), small areas of rock exposure, mostly granodiorite (Xgd), Pliocene to early Pleistocene river deposits (QTsr), and Pleistocene river terraces (Qir, Qy2) which comprise 62%, 31%, 3%, 2% and 1% of the unit, respectively
Landforms: 
coarsely dissected, weakly incised fan and pediment surfaces

ELT 8e

Elevation Range
Minimum: 
957 m
Minimum in ft: 
3141 ft
Maximum: 
1039 m
Maximum in ft: 
3410 ft
Median: 
999 m
Median in ft: 
3278 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; modest development (lime and clay accumulation); dominated by Pima County soil survey map units 60 (Pinaleno-Stagecoach complex, 5 to 16 percent slopes) and 61 (Pinaleno-Stagecoach-Palos Verdes complex, 10 to 35 percent slopes). These units comprise 67% and 30% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with old alluvium (QTs), Pleistocene river terraces (Qir, Qy2,Qyr), Pleistocene piedmont alluvium (Qi2, Qi, Qi1, Qi1r, Qi2r, Qi3, Qy), and small areas of rock exposure, mostly limestone and related rocks which comprise 47%, 31%, 12% and 9% of the unit, respectively
Landforms: 
finely dissected, moderately to deeply incised fan and pediment surfaces

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