Sections

Ecological Land Types within LTA 168.

ELT 168a

Elevation Range
Minimum: 
841 m
Minimum in ft: 
2760 ft
Maximum: 
1090 m
Maximum in ft: 
3575 ft
Median: 
945 m
Median in ft: 
3100 ft
Soil Summary: 
detailed soil survey data is incomplete for this unit; very little coverage exists
Geologic Materials: 
alluvium and residuum associated with Pleistocene piedmont alluvium, undivided and unnamed (Qi, Qp); the Redington Member, Quiburis Formation, alluvial plain subfacies, sand (Tqsr); sandy fan-toe, lake-margin, and delta-front sandflat facies of Quiburis Formation (Tqs); and gravelly alluvial-fan and braidplain facies of Quiburis Formation (Tqc) which comprise 49%, 24%, 18% and 8% of the unit, respectively
Landforms: 
undissected to coarsely dissected, weakly incised fan and pediment surfaces

ELT 168b

Elevation Range
Minimum: 
878 m
Minimum in ft: 
2882 ft
Maximum: 
1087 m
Maximum in ft: 
3567 ft
Median: 
967 m
Median in ft: 
3173 ft
Soil Summary: 
soils include very and extremely gravelly loams shallow to a caliche hardpan and very deep, very gravelly sandy loam to sand surface soils over gravelly, very gravelly and extremely gravelly sandy loam to sand subsurface layers, soils are limy throughout, moderate to strong development (lime accumulation and cementation), other soils are moderately deep to a lime cemented hardpan and have very cobbly loam surfaces over very cobbly clay loam and clay, lime deeper in the soil profile, and strong development (clay accumulation and cementation); unit dominated by Pima County soil survey map units 22 (Delnorte-Stagecoach complex, 1 to 20 percent slopes), 50 (Nahda very cobbly loam, 2 to 8 percent slopes) and 67 (Redo very gravelly sand, 15 to 50 percent slopes). These units comprise 38%, 32% and 26% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with middle to late Pleistocene piedmont alluvium , undivided (Q1) and sandstone, siltstone, and conglomerate, undivided (QTs) which comprise 92% and 6% of the unit, respectively
Landforms: 
undissected to coarsely dissected, weakly incised fan and pediment surfaces

ELT 168c

Elevation Range
Minimum: 
984 m
Minimum in ft: 
3229 ft
Maximum: 
1106 m
Maximum in ft: 
3630 ft
Median: 
1054 m
Median in ft: 
3458 ft
Soil Summary: 
very deep, gravelly or very gravelly loam and sandy loam surfaces with subsoils ranging from clays to very gravelly sandy clay loams, lime occurs deep in the profile or is lacking altogether, well developed (clay accumulation); unit dominated by Pima County soil survey map units 85 (White House gravelly loam, 1 to 8 percent slopes) and 84 (White House-Caralampi complex, 5 to 25 percent slopes). These units comprise 54% and 44% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with early Pleistocene piedmont alluvium , undivided (Qo) and sandstone, siltstone, and conglomerate, undivided (QTs) which comprise 54% and 45% of the unit, respectively
Landforms: 
undissected to coarsely dissected, weakly incised fan and pediment surfaces

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