Ecological Land Types within LTA 28.

ELT 28a

Elevation Range

Minimum:

1186 m

Minimum in ft:

3890 ft

Maximum:

1265 m

Maximum in ft:

4151 ft

Median:

1239 m

Median in ft:

4065 ft

Soil Summary:

dominant soils are very deep, very gravelly loamy sand and fine sandy loam to clay loam surfaces over gravelly, very gravelly and extremely gravelly sandy loam, fine sandy loam and or loamy sands or clay, clay loam and gravelly clay loam subsurface layers, limy throughout to more than a foot to lime, moderate to strong development (lime and clay accumulation) ; unit is dominated by Cochise County, Northwestern Part soil survey unit 79 (Stronghold-McAllister-Elgin complex, 5 to 25 percent slopes), Pima County soil survey map unit 79 (Tombstone very gravelly loam, 15 to 50 percent slopes), Cochise County, Northwestern Part soil survey unit 83 (Tombstone-Stronghold complex, 5 to 30 percent slopes), and Pima County soil survey map unit 6 (Bernardino-Tombstone asssociation, 5 to 16 percent slopes). This units comprise 37%, 15%, 12% and 12% of the ELT

Geologic Materials:

alluvium and residuum associated with sandstone, siltstone and conglomerate, undivided (QTs); basin fill deposits (QTs); Holocene alluvium (Qy); and Holocene piedmont alluvium, undivided (Qy) which comprise 36%, 35%, 12% and 5% of the unit, respectively

Landforms:

coarsely to finely dissected, weakly to moderately incised fan and pediment surfaces

ELT 28b

Elevation Range

Minimum:

1234 m

Minimum in ft:

4049 ft

Maximum:

1290 m

Maximum in ft:

4232 ft

Median:

1259 m

Median in ft:

4131 ft

Soil Summary:

dominant soils are very deep, very gravelly loamy sand and fine sandy loam to clay loam surfaces over gravelly, very gravelly and extremely gravelly sandy loam, fine sandy loam and or loamy sands or clay, clay loam and gravelly clay loam subsurface layers, limy throughout to more than a foot to lime, moderate to strong development (lime and clay accumulation) ; unit is dominated by Pima County soil survey map unit 79 (Tombstone very gravelly loam, 15 to 50 percent slopes), Pima County soil survey map unit 6 (Bernardino-Tombstone asssociation, 5 to 16 percent slopes) and Cochise County, Northwestern Part soil survey unit 79 (Stronghold-McAllister-Elgin complex, 5 to 25 percent slopes). This units comprise 69%, 24% and 7% of the ELT

Geologic Materials:

alluvium and residuum associated with sandstone, siltstone and conglomerate, undivided (QTs) and Holocene piedmont alluvium, undivided (Qy) which comprise 70% and 18% of the unit, respectively

Landforms:

finely dissected, weakly to moderately incised fan and pediment surfaces

ELT 28c

Elevation Range

Minimum:

1180 m

Minimum in ft:

3873 ft

Maximum:

1259 m

Maximum in ft:

4132 ft

Median:

1222 m

Median in ft:

4009 ft

Soil Summary:

dominant soils are very deep, very gravelly loamy sand and fine sandy loam to loam surfaces over gravelly, very gravelly and extremely gravelly sandy loam or clay, clay loam and gravelly clay loam subsurface layers, limy throughout or a foot or more to lime, moderate to strong development (lime and clay accumulation) ; unit is dominated by Cochise County, Northwestern Part soil survey unit 79 (Stronghold-McAllister-Elgin complex, 5 to 25 percent slopes). This unit comprises 96% of the ELT

Geologic Materials:

alluvium and residuum associated with sandstone, siltstone and conglomerate, undivided (QTs) and Holocene piedmont alluvium, undivided (Qy) which comprise 94% and 5% of the unit, respectively

Landforms:

finely dissected, weakly incised fan and pediment surfaces

ELT 28d

Elevation Range

Minimum:

1195 m

Minimum in ft:

3922 ft

Maximum:

1309 m

Maximum in ft:

4296 ft

Median:

1252 m

Median in ft:

4108 ft

Soil Summary:

soil survey data is incomplete for a small portion of this unit but the dominant soils are very deep, very gravelly loamy sand to loam surfaces over gravelly, very gravelly and extremely gravelly sandy loam to sandy clay loam or clay, clay loam, sandy clay loam and gravelly clay loam subsurface layers, limy throughout or roughly a foot or more to lime, moderate to strong development (lime and clay accumulation), some very deep non-limy soils with extremely gravelly sandy loam surfaces over mostly very gravelly sandy clay loam subsoils also occur in the ELT; unit is dominated by Cochise County, Northwestern Part soil survey unit 79 (Stronghold-McAllister-Elgin complex, 5 to 25 percent slopes), Pima County soil survey map unit 6 (Bernardino-Tombstone association, 5 to 16 percent slopes), Cochise County, Northwestern Part soil survey unit 62 (Nolam-Stronghold complex, 5 to 30 percent slopes) and Pima County soil survey map unit 10 (Caralampi extremely gravelly sandy loam, 15 to 45 percent slopes). They comprise 40%, 20%, 19% and 16% of the covered area, respectively

Geologic Materials:

alluvium and residuum associated with sandstone, siltstone and conglomerate, undivided (QTs) which comprises 94% of the unit, respectively

Landforms:

finely dissected, weakly to moderately incised fan and pediment surfaces

ELT 28e

Elevation Range

Minimum:

1245 m

Minimum in ft:

4084 ft

Maximum:

1408 m

Maximum in ft:

4621 ft

Median:

1305 m

Median in ft:

4281 ft

Soil Summary:

soil survey data is incomplete for about half of this ELT but the dominant soils are very deep sandy loams with minimal lime deposits deeper in the soil profile associated with relatively recent alluvial deposits and some very deep better developed (clay accumulation) non-limy soils with extremely gravelly sandy loam surfaces over mostly very gravelly sandy clay loam subsoils; the mapped areas are dominated by Pima County soil survey map unit 6 (Comoro sandy loam, 0 to 2 percent slopes) and 10 (Caralampi extremely gravelly sandy loam, 15 to 45 percent slopes).

Geologic Materials:

alluvium and residuum associated with sandstone, siltstone and conglomerate, undivided (QTs); Holocene piedmont alluvium, undivided (Qy); middle to late Pleistocene piedmont alluvium, undivided (Qi2); and late to latest Pleistocene piedmont alluvium (Qi3) which comprise 67%, 11%, 9% and 7% of the unit, respectively

Landforms:

moderately dissected, moderately to deeply incised fan and pediment surfaces

ELT 28f

Elevation Range

Minimum:

1156 m

Minimum in ft:

3793 ft

Maximum:

1224 m

Maximum in ft:

4016 ft

Median:

1197 m

Median in ft:

3927 ft

Soil Summary:

Geologic Materials:

alluvium and residuum associated with sandstone, siltstone and conglomerate, undivided (QTs), middle to late Pleistocene piedmont alluvium (Qi2), and Holocene piedmont alluvium, undivided (Qy) which comprise 86%, 7% and 7% of the unit, respectively

Landforms:

moderately to finely dissected, weakly incised fan and pediment surfaces

ELT 28g

Elevation Range

Minimum:

1147 m

Minimum in ft:

3762 ft

Maximum:

1325 m

Maximum in ft:

4348 ft

Median:

1184 m

Median in ft:

3885 ft

Soil Summary:

soil survey data is incomplete for a small portion of this unit but the dominant soils are very deep, very gravelly loamy sand and fine sandy loam to loam surfaces over gravelly, very gravelly and extremely gravelly sandy loam or clay, clay loam, sandy clay loam and gravelly clay loam subsurface layers, limy throughout or roughly a foot or more to lime, moderate to strong development (lime and clay accumulation) ; unit is dominated by Cochise County, Northwestern Part soil survey unit 79 (Stronghold-McAllister-Elgin complex, 5 to 25 percent slopes) and 62 (Nolam-Stronghold complex, 5 to 30 percent slopes). They comprise 50% and 22% of the covered area, respectively

Geologic Materials:

alluvium and residuum associated with sandstone, siltstone and conglomerate, undivided (QTs); middle to late Pleistocene piedmont alluvium, undivided (Qi); Holocene piedmont alluvium, undivided (Qy); and modern channel deposits (Qyc) which comprise 62%, 13%, 12% and 7% of the unit, respectively

Landforms:

moderately to finely dissected, weakly to moderately incised fan and pediment surfaces

ELT 28h

Elevation Range

Minimum:

1139 m

Minimum in ft:

3738 ft

Maximum:

1238 m

Maximum in ft:

4061 ft

Median:

1184 m

Median in ft:

3885 ft

Soil Summary:

dominant soils are very deep, very gravelly loamy sand and very gravelly and gravelly fine sandy loam surfaces over gravelly and very gravelly sandy loams and sandy clay loams, clay, gravelly clay, gravelly clay loam and very gravelly clay loam subsurface layers, limy throughout or roughly a foot or more to lime, moderate to strong development (lime and clay accumulation) ; unit is dominated by Cochise County, Northwestern Part soil survey unit 83 (Tombstone-Stronghold complex, 5 to 30 percent slopes) and 55 (Libby-Gulch complex, 0 to 10 percent slopes). They comprise 60% and 20% of the ELT respectively

Geologic Materials:

alluvium and residuum associated with sandstone, siltstone and conglomerate, undivided (QTs); early Pleistocene alluvium (Qo); middle to late Pleistocene piedmont alluvium (Qi2); basin fill deposits (QTs); late to latest Pleistocene piedmont deposits (Qi3); Holocene piedmont alluvium, undivided (Qy); and Holocene piedmont alluvium, undivided (Qy) which comprise 42%, 12%, 11%, 10%, 7% and 6% of the unit, respectively

Landforms:

coarsely to finely dissected, weakly to moderately incised fan and pediment surfaces

Ecological Land Types within LTA 28.

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