Ecological Land Types within LTA 38.

ELT 38a

Elevation Range

Minimum:

1079 m

Minimum in ft:

3539 ft

Maximum:

1251 m

Maximum in ft:

4103 ft

Median:

1140 m

Median in ft:

3740 ft

Soil Summary:

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); other soils are finer textured and very deep, typically silt loam surfaces over silty clay and clay subsurface layers, lime and gypsum concentrations occur throughout, moderate to strong development (lime and gypsum accumulation, clay accumulation); other soils have fine sandy loam surfaces and loam and fine sandy loam subsurface layers with lime and gypsum concentrations throughout, and moderate to strong development (lime and gypsum accumulation); dominated by Cochise County Northeastern Part soil survey map units 14 (Calcigypsids-Contention-Redo complex, Chihuahuan, 5 to 45 percent slopes) and 27 (Contention and Monzingo soils, 5 to 60 percent slopes). These units comprise 61% and 19% of the ELT, respectively

Geologic Materials:

alluvium and residuum associated with the St. David Formation, undifferentiated (Tsd); Pliocene-Pleistocene conglomerate and sandstone (QTcs); Late Pliocene-Early Pleistocene relict basin floor deposit (QTbf); Middle Pleistocene piedmont alluvium (Qi2); and undifferentiated Holocene derived from Tsd (Qysd) which comprise 52%, 12%, 10%, 10% and 7% of the ELT, respectively

Landforms:

moderately to finely dissected, moderately to deeply incised fans, terraces and pediments

ELT 38b

Elevation Range

Minimum:

1054 m

Minimum in ft:

3457 ft

Maximum:

1111 m

Maximum in ft:

3645 ft

Median:

1078 m

Median in ft:

3537 ft

Soil Summary:

Geologic Materials:

alluvium and residuum associated with the Pliocene-Pleistocene conglomerate and sandstone (QTcs); Middle to Early Pleistocene alluvium (Qi1); Late Holocene alluvium (Qy2); Pliocene-Pleistocene basin fill conglomerates (QTc); and Pliocene red fine-grained basin fill deposits (Ts) which comprise 38%, 25%, 15%, 7% and 6% of the ELT, respectively

Landforms:

moderately to finely dissected, moderately to deeply incised fans, terraces and pediments

ELT 38c

Elevation Range

Minimum:

1035 m

Minimum in ft:

3396 ft

Maximum:

1178 m

Maximum in ft:

3865 ft

Median:

1079 m

Median in ft:

3540 ft

Soil Summary:

dominant soils are highly variable in terms of texture but all have concentrations of gypsum and lime; some soils have silt loam surface layers over silty clay and clay subsoils, others are fine sandy loams and loams over silt loams, fine sandy loams, and loamy coarse sand, often stratified, other soils have loamy fine sand surface layers over fine sand ; dominated by Cochise County Northeastern Part soil survey map units 31 (Contention-Ugyp complex, 0 to 5 percent slopes), 32 (Contention-Whitecliff complex, eroded, 0 to 5 percent slopes), 9 (Brazito loamy sand, Chihuahuan, 0 to 5 percent slopes), and 29 (Contention silt loam, 2 to 5 percent slopes). These units comprise 23%, 17%, 17% and 10% of the ELT, respectively

Geologic Materials:

alluvium associated with Late Holocene alluvium (Qy2); undifferentiated Holocene alluvium (Qy); undifferentiated Holocene alluvium derived from Tsd (Qysd); and thin Holocene alluvium and Pliocene-Pleistocene basin fill (Qys) which comprise 37%, 22%, 9% and 9% of the unit, respectively

Landforms:

coarsely dissected, weakly incised fans, terraces and pediments

ELT 38d

Elevation Range

Minimum:

1126 m

Minimum in ft:

3693 ft

Maximum:

1192 m

Maximum in ft:

3912 ft

Median:

1153 m

Median in ft:

3783 ft

Soil Summary:

Geologic Materials:

data unavailable; in general associated with old alluvial and lakebed deposits

Landforms:

moderately to finely dissected, moderately to deeply incised fans, terraces and pediments

ELT 38e

Elevation Range

Minimum:

1031 m

Minimum in ft:

3382 ft

Maximum:

1234 m

Maximum in ft:

4050 ft

Median:

1113 m

Median in ft:

3652 ft

Soil Summary:

Geologic Materials:

alluvium and residuum associated with the Pliocene-Pleistocene basin fill conglomerates (QTc); Pliocene-Pleistocene conglomerate and sandstone (QTcs); Late Holocene alluvium (Qy2); sandstone? (QTss); Holocene piedmont alluvium, undivided (Qy); and Pliocene red fine-grained basin fill deposits (Ts) which comprise 22%, 21%, 15%, 11%, 9% and 9% of the ELT, respectively

Landforms:

finely dissected, weakly to moderately incised fans, terraces and pediments

ELT 38f

Elevation Range

Minimum:

1074 m

Minimum in ft:

3522 ft

Maximum:

1161 m

Maximum in ft:

3810 ft

Median:

1120 m

Median in ft:

3675 ft

Soil Summary:

Geologic Materials:

alluvium and residuum associated with the Pliocene-Pleistocene conglomerate and sandstone (QTcs); sandstone, siltstone and conglomerate, undivided (QTs); Holocene piedmont alluvium, undivided (Qy) and Late Pliocene-Early Pleistocene relict basin floor deposit (QTbf)which comprise 56%, 21%, 12% and 5% of the ELT, respectively

Landforms:

finely dissected, weakly to moderately incised fans, terraces and pediments

ELT 38g

Elevation Range

Minimum:

1064 m

Minimum in ft:

3491 ft

Maximum:

1168 m

Maximum in ft:

3833 ft

Median:

1134 m

Median in ft:

3720 ft

Soil Summary:

Geologic Materials:

alluvium and residuum associated with the Pliocene-Pleistocene conglomerate and sandstone (QTcs); sandstone? (QTss); Late Holocene alluvium (Qy2); Middle to Late Pleistocene piedmont alluvium (Qi2); Early Pleistocene alluvium (Qo); and sandstone, siltstone and conglomerate, undivided (QTs) which comprise 50%, 17%, 8%, 7%, 7% and 5% of the ELT, respectively

Landforms:

finely dissected, weakly to moderately incised fans, terraces and pediments

ELT 38h

Elevation Range

Minimum:

1060 m

Minimum in ft:

3478 ft

Maximum:

1167 m

Maximum in ft:

3828 ft

Median:

1124 m

Median in ft:

3688 ft

Soil Summary:

Geologic Materials:

alluvium and residuum associated with the Pliocene-Pleistocene conglomerate and sandstone (QTcs); Late Pliocene-Early Pleistocene relict basin floor deposits (QTbf); Early Pleistocene alluvium (Qo); and Late Holocene alluvium (Qy2) which comprise 39%, 32%, 19% and 5% of the ELT, respectively

Landforms:

coarsely to finely dissected, weakly to moderately incised fans, terraces and pediments

ELT 38i

Elevation Range

Minimum:

1020 m

Minimum in ft:

3347 ft

Maximum:

1117 m

Maximum in ft:

3664 ft

Median:

1044 m

Median in ft:

3425 ft

Soil Summary:

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); other soils are finer textured and very deep, typically silt loam surfaces over silty clay and clay subsurface layers, lime and gypsum concentrations occur throughout, moderate to strong development (lime and gypsum accumulation, clay accumulation); still other soil components are very deep, gravelly sandy loam to loamy sand surface layers over subsurface layers ranging from gravelly and very gravelly sandy loams to gravelly and very gravelly loamy sands and coarse sands, often stratified, lime content varies, no to little development; other soils are very deep, have loamy fine sand surface layers over fine sand subsurface layers, some lime but content varies throughout profile, no or little development; unit is dominated by Cochise County Northeastern Part soil survey map unit 14 (Calcigypsids-Contention-Redo complex, Chihuahuan, 5 to 45 percent slopes), 1 (Agustin-Yturbide-Kokan complex, Chihuahuan, 1 to 8 percent slopes), and 9 (Brazito loamy sand, Chihuahuan, 0 to 5 percent slopes). These units comprise 45%, 33% and 21% of the ELT, respectively

Geologic Materials:

alluvium and residuum associated with Late Holocene alluvium (Qy2); Middle Pleistocene alluvium (Qi2); Middle Pleistocene river terrace deposits (Qi2r); Late Holocene river deposits (Qy2r); and Pliocene red fine-grained basin fill deposits (Ts) which comprise 56%, 13%, 13%, 8% and 5% of the ELT, respectively

Landforms:

coarsely to moderately dissected, weakly to moderately incised fans, terraces and pediments

ELT 38j

Elevation Range

Minimum:

1020 m

Minimum in ft:

3347 ft

Maximum:

1117 m

Maximum in ft:

3664 ft

Median:

1044 m

Median in ft:

3425 ft

Soil Summary:

a major soil component ranges from shallow to caliche hardpan to very deep, sandy loam to very gravelly sandy loam and loam surfaces over gravelly, very gravelly, and extremely gravelly sandy loam and loam subsurface layers, is limy throughout, and has moderate to strong development (lime accumulation and cementation); other soils are very deep, very gravelly sandy loam to sand surface soils over gravelly, very gravelly and extremely gravelly sandy loam to sand subsurface layers, limy throughout, moderate to strong development (lime accumulation); other soil components are finer textured and very deep, typically silt loam surfaces over silty clay and clay subsurface layers, lime and gypsum concentrations occur throughout, moderate to strong development (lime and gypsum accumulation, clay accumulation); still other soils are very deep, gravelly sandy loam to loamy sand surface layers over subsurface layers ranging from gravelly and very gravelly sandy loams to gravelly and very gravelly loamy sands and coarse sands, often stratified, lime content varies, with no to little development; dominated by Cochise County Northeastern Part soil survey map units77 (Stagecoach-Whitlock-Delnorte complex, Chihuahuan, 5 to 20 percent slopes), 14 (Calcigypsids-Contention-Redo complex, Chihuahuan, 5 to 45 percent slopes) and 1 (Agustin-Yturbide-Kokan complex, Chihuahuan, 1 to 8 percent slopes). These units comprise 38%, 33% and 23% of the ELT, respectively

Geologic Materials:

alluvium and residuum associated with Late Holocene alluvium (Qy2); Quiburis basin fill deposits, undivided (Tq); Late Pleistocene alluvium (Qi3); Late Pliocene alluvium, widespread capping Quiburis basin (Tqf); Middle Pleistocene alluvium (Qi2); and Quiburis basin fill deposit, playa/distal fan facies (Tqp) which comprise 26%, 21%, 17%, 10%, 7% and 6% of the ELT, respectively

Landforms:

finely to moderately dissected, weakly to moderately incised fans, terraces and pediments

Ecological Land Types within LTA 38.

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