Sections

Ecological Land Types within LTA 167.

ELT 167a

Elevation Range
Minimum: 
782 m
Minimum in ft: 
2564 ft
Maximum: 
1055 m
Maximum in ft: 
3460 ft
Median: 
879 m
Median in ft: 
2884 ft
Soil Summary: 
detailed soil survey data is incomplete for this unit; based on the mapped portion of the unit the dominant 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); the mapped areas are dominated by Pima County soil survey map units 67 (Redo very gravelly sand, 15 to 50 percent slopes) and 22 (Delnorte-Stagecoach complex, 1 to 20 percent slopes)
Geologic Materials: 
alluvium and residuum associated with Redington Member, Quiburis Formation, alluvial plain subfacies, sand (Tqsr); sandstone, siltstone, and conglomerate, undivided (QTs); sandy fan-toe, lake-margin, and delta-front sandflat facies of Quiburis Formation (Tqs); middle to late Pleistocene piedmont alluvium, undivided (Qi); and diatomaceous facies of laminated lacustrine facies of Quiburis Formation (Tqld) which comprise 22%, 21%, 18%, 15%, and 14% of the unit, respectively
Landforms: 
moderately to finely dissected, moderately to deeply incised fan and pediment surfaces

ELT 167b

Elevation Range
Minimum: 
975 m
Minimum in ft: 
3200 ft
Maximum: 
1066 m
Maximum in ft: 
3496 ft
Median: 
1015 m
Median in ft: 
3330 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); unit dominated by Pima County soil survey map units 22 (Delnorte-Stagecoach complex, 1 to 20 percent slopes) and 67 (Redo very gravelly sand, 15 to 50 percent slopes). These units comprise 68% and 13% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with middle to late Pleistocene piedmont alluvium, undivided (Qi) and sandstone, siltstone, and conglomerate, undivided (QTs) which comprise 95% and 5% of the unit, respectively
Landforms: 
non dissected to coarsely dissected, weakly incised fan and pediment surfaces

ELT 167c

Elevation Range
Minimum: 
901 m
Minimum in ft: 
2956 ft
Maximum: 
1027 m
Maximum in ft: 
3368 ft
Median: 
969 m
Median in ft: 
3179 ft
Soil Summary: 
detailed soil survey data is incomplete for this unit; based on the mapped portion of the unit the dominant soils include 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); the mapped areas are dominated by Pima County soil survey map unit 67 (Redo very gravelly sand, 15 to 50 percent slopes)
Geologic Materials: 
alluvium and residuum associated with middle to late Pleistocene piedmont alluvium, undivided (Qi) and Redington Member, Quiburis Formation, alluvial plain subfacies, sand (Tqsr) which comprise 52%, and 43% of the unit, respectively
Landforms: 
moderately to finely dissected, moderately incised fan and pediment surfaces

ELT 167d

Elevation Range
Minimum: 
964 m
Minimum in ft: 
3163 ft
Maximum: 
1065 m
Maximum in ft: 
3494 ft
Median: 
1014 m
Median in ft: 
3327 ft
Soil Summary: 
soils include very deep, very gravelly sandy fine loam to sand surface soils over gravelly, very gravelly and extremely gravelly sandy loam to sand subsurface layers, some soils lack high subsurface gravel contents and are dominantly fine sandy loams and loams in the lower profile, also smaller areas of very and extremely gravelly loams shallow to a caliche hardpan ,all soils are limy throughout, moderate to strong development (lime accumulation); unit dominated by Pima County soil survey map units 78 (Stagecoach-Sahuarita association, 1 to 8 percent slopes), 67 (Redo very gravelly sand, 15 to 50 percent slopes) and 22 (Delnorte-Stagecoach complex, 1 to 20 percent slopes). These units comprise 74%, 14% and 11% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with middle to late Pleistocene piedmont alluvium, undivided (Qi) and sandstone, siltstone, and conglomerate, undivided (QTs) which comprise 72% and 24% of the unit, respectively
Landforms: 
undissected fan and pediment surfaces

ELT 167e

Elevation Range
Minimum: 
914 m
Minimum in ft: 
3000 ft
Maximum: 
1077 m
Maximum in ft: 
3534 ft
Median: 
989 m
Median in ft: 
3245 ft
Soil Summary: 
dominant soils that are shallow and moderately deep to a caliche hardpan, have very gravelly sandy loam surfaces over very and extremely gravelly sandy loam and sandy clay loam subsurface layers, are limy throughout and have strong development (lime accumulation and cementation); unit is dominated by Pima County soil survey map unit 65 (Powerline-Kimrose family complex, 10 to 35 percent slopes). These units comprise 90% of the ELT, respectively
Geologic Materials: 
alluvium and residuum associated with sandstone, siltstone, and conglomerate, undivided (QTs); middle to late Pleistocene piedmont alluvium, undivided (Qi) and Holocene piedmont alluvium, undivided (Qy) which comprise 79%, 9% and 9% of the unit, respectively
Landforms: 
undissected to coarsely dissected, weakly incised fan and pediment surfaces

ELT 167f

Elevation Range
Minimum: 
779 m
Minimum in ft: 
2555 ft
Maximum: 
1079 m
Maximum in ft: 
3541 ft
Median: 
953 m
Median in ft: 
3127 ft
Soil Summary: 
detailed soil survey data is not available for this unit
Geologic Materials: 
alluvium and residuum associated with gravelly alluvial-fan and braidplain facies of Quiburis Formation (Tqc); sandy fan-toe, lake-margin, and delta-front sandflat facies of Quiburis Formation (Tqs); diatomaceous facies of laminated lacustrine facies of Quiburis Formation (Tqld); and the Redington Member, Quiburis Formation, alluvial plain subfacies, sand (Tqsr) which comprise 48%, 35%, 9% and 5% of the unit, respectively
Landforms: 
moderately dissected, weakly to moderately incised fan and pediment surfaces

Catalina