Sections

Ecological Land Types within LTA 37.

ELT 37a

Elevation Range
Minimum: 
1156 m
Minimum in ft: 
3794 ft
Maximum: 
1334 m
Maximum in ft: 
4376 ft
Median: 
1257 m
Median in ft: 
4124 ft
Soil Summary: 
very deep, sandy loam surface over mostly clay loams, clays, sandy clay loams, and gravelly clay loams and sandy clay loams, lime a foot or two or more below the soil surface, strong development (clay accumulation); also includes very deep alluvial soils with extremely gravelly sandy loam surfaces over very gravelly sandy loams and extremely gravelly sands, with little or no development (relatively recent alluvium); dominated by Cochise County Northeastern Part soil survey map units 35 (Courtland-Sasabe-Diaspar complex, 1 to 8 percent slopes), 7 (Bodecker-Riverwash complex, 0 to 3 percent slopes) and 73 (Sasabe-Courtland complex, 1 to 8 percent slopes). These units comprise 64%, 11% and 10% of the ELT, respectively
Geologic Materials: 
alluvium, colluvium, and residuum associated with middle Pleistocene piedmont alluvium (Qi2); middle to late Pleistocene alluvium (Qyi) and early Holocene to latest Pleistocene alluvium (Qyi) which comprise 55%, 19% and 10% of the ELT, respectively
Landforms: 
moderately to finely dissected, moderately to deeply incised fans

ELT 37b

Elevation Range
Minimum: 
1174 m
Minimum in ft: 
3853 ft
Maximum: 
1230 m
Maximum in ft: 
4037 ft
Median: 
1200 m
Median in ft: 
3937 ft
Soil Summary: 
very deep, very gravelly sandy loam surface layer over very gravelly and gravelly sandy clay loam subsoils, no lime, moderate to strong development (clay accumulation); dominated by Pima County soil survey map unit 9 (Caralampi very gravelly sandy loam, 5 to 15 percent slopes) which comprises 99% of the ELT
Geologic Materials: 
alluvium, colluvium, and residuum associated with late to latest Pleistocene piedmont alluvium (Qi3); alluvium (Qi); middle to late Pleistocene piedmont alluvium (Qi2); basin fill deposits (QTs) and Pantano Conglomerate, variably silicified (Tpl) which comprise 47%, 17%, 11%, 11% and 10% of the ELT, respectively
Landforms: 
moderately dissected, weakly to moderately incised fans and pediments

ELT 37c

Elevation Range
Minimum: 
1122 m
Minimum in ft: 
3682 ft
Maximum: 
1221 m
Maximum in ft: 
4007 ft
Median: 
1168 m
Median in ft: 
3832 ft
Soil Summary: 
very deep, very gravelly sandy loam surface layers over clay, gravelly clay, and very gravelly clay loam subsoils and other soils with gravelly fine sandy loam surface layers over sandy loam, sandy clay loam, and gravelly clay loam subsoils, lime throughout or near the surface, moderate to strong development (clay accumulation); dominated by Cochise County Northeastern Part soil survey map unit 55 (Libby-Gulch complex, 0 to 10 percent slopes). These units comprises 89% of the ELT
Geologic Materials: 
alluvium, colluvium, and residuum associated with middle Pleistocene piedmont alluvium (Qi2); Late Pliocene –Early Pleistocene relict basin floor deposit (QTbf); basin fill deposits (QTs); Holocene alluvium (Qy); ); Middle to Early Pleistocene alluvium (Qi1) and Early Pleistocene alluvium (Qo) which comprise 38%, 10%, 9%, 9%, 9% and 8% of the ELT, respectively
Landforms: 
moderately dissected, moderately incised fans

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