Ecological Land Types within LTA 18.

ELT 18a

Elevation Range

Minimum:

971 m

Minimum in ft:

3187 ft

Maximum:

1433 m

Maximum in ft:

4702 ft

Median:

1136 m

Median in ft:

3727 ft

Soil Summary:

soil survey data coverage is incomplete for this ELT; mapped areas are mostly shallow to bedrock, a complex of limy very gravelly over extremely cobbly loams with little or no development associated with limestone, better developed extremely channery loams over extremely channery clays related to phyllite and lacking lime, and limy extremely gravelly loams associated with sandstone ; the mapped areas are dominated by Pima County soil survey map units 23 (Deloro-Andrada complex, 5 to 35 percent slopes) and 42 (Mabray-Deloro-Rock outcrop complex, 25 to 60 percent slopes)

Geologic Materials:

alluvium, colluvium and residuum associated with Glance Conglomerate/Bisbee Group (KJb, KJbg); sandstone, siltstone and conglomerate, undivided (QTs) and Pinal Schist (Xp) which comprise 78%, 6% and 5% of the unit, respectively

Landforms:

finely dissected, deeply incised mountain slopes

ELT 18b

Elevation Range

Minimum:

887 m

Minimum in ft:

2911 ft

Maximum:

1331 m

Maximum in ft:

4368 ft

Median:

1052 m

Median in ft:

3451 ft

Soil Summary:

soils mostly shallow to bedrock in a complex of limy very gravelly over extremely cobbly loams with little or no development associated with limestone and better developed non-limy extremely channery loams over extremely channery clays related to phyllite; unit dominated by Pima County soil survey map unit 42 (Mabray-Deloro-Rock outcrop complex, 25 to 60 percent slopes). This unit comprises 98% of the ELT

Geologic Materials:

alluvium, colluvium and residuum associated with Glance Conglomerate/Bisbee Group (KJb, KJbg); sandstone, siltstone and conglomerate, undivided (QTs) and tectonites (P1s) which comprise 63%, 17% and 15% of the unit, respectively

Landforms:

coarsely to moderately dissected, moderately to deeply incised mountain slopes

ELT 18c

Elevation Range

Minimum:

1007 m

Minimum in ft:

3304 ft

Maximum:

1135 m

Maximum in ft:

3724 ft

Median:

1072 m

Median in ft:

3517 ft

Soil Summary:

shallow to bedrock (mostly phyllite, andesite and similar rock types), very gravelly sandy loams to extremely channery loams over very gravelly sandy clay loams to extremely channery clays, lacking lime, moderate to high development (clay accumulation); unit dominated by Pima County soil survey map unit 56 (Pantak-Deloro complex, 8 to 35 percent slopes). This unit comprises 100% of the ELT

Geologic Materials:

alluvium, colluvium and residuum associated with Undivided Oligocene to Miocene Volcanic Rocks (Tv); Tertiary Sediments (Ts); Xgl; and sandstone, siltstone and conglomerate, undivided (QTs) which comprise 44%, 37%, 10% and 8% of the unit, respectively

Landforms:

moderately dissected, deeply incised mountain slopes

ELT 18d

Elevation Range

Minimum:

998 m

Minimum in ft:

3275 ft

Maximum:

1393 m

Maximum in ft:

4569 ft

Median:

1237 m

Median in ft:

4058 ft

Soil Summary:

soils are mostly shallow to bedrock, a complex of limy very gravelly over extremely cobbly loams with little or no development associated with limestone, better developed extremely channery loams over extremely channery clays related to phyllite and lacking lime, and limy extremely gravelly loams associated with sandstone ; other soils are shallow to granite or granite like rocks, have gravelly or very gravelly sandy loam surfaces layers over very gravelly fine sandy loams or very gravelly sandy clay loams, they lack lime, and have no to moderate development (clay accumulation); the ELT is dominated by Pima County soil survey map units 42 (Mabray-Deloro-Rock outcrop complex, 25 to 60 percent slopes), 23 (Deloro-Andrada complex, 5 to 35 percent slopes) and Cochise County, Northwestern Part soil survey unit 69 (Romero-Rodman-Rock outcrop complex, 5 to 60 percent slopes). These unit comprise 50%, 25% and 14% of the ELT, respectively

Geologic Materials:

alluvium, colluvium and residuum associated with Glance Conglomerate/Bisbee Group (KJb, KJbg); Catalina-Rincon igneous metamorphic complex (TXm); and tectonite derived from Devonian and Cambrian sedimentary rocks (TDCt) which comprise 58%, 12% and 8% of the unit, respectively

Landforms:

moderately to finely dissected, moderately to deeply incised mountain slopes

ELT 18e

Elevation Range

Minimum:

984 m

Minimum in ft:

3227 ft

Maximum:

1195 m

Maximum in ft:

3919 ft

Median:

1076 m

Median in ft:

3530 ft

Soil Summary:

mostly shallow to bedrock, a complex of limy very gravelly over extremely cobbly loams with little or no development associated with limestone, better developed extremely channery loams over extremely channery clays related to phyllite and lacking lime, and limy extremely gravelly loams associated with sandstone ; unit dominated by Pima County soil survey map unit 23 (Deloro-Andrada complex, 5 to 35 percent slopes) and 42 (Mabray-Deloro-Rock outcrop complex, 25 to 60 percent slopes). These units comprise 76% and 21% of the ELT, respectively

Geologic Materials:

alluvium, colluvium and residuum associated with Tertiary Sediments (Ts); Undivided Oligocene to Miocene Volcanic Rocks (Tv); and sandstone, siltstone and conglomerate, undivided (QTs) which comprise 58%, 30% and 5% of the unit, respectively

Landforms:

coarsely to moderately dissected, moderately to deeply incised mountain slopes

ELT 18f

Elevation Range

Minimum:

887 m

Minimum in ft:

2911 ft

Maximum:

1331 m

Maximum in ft:

4368 ft

Median:

1052 m

Median in ft:

3451 ft

Soil Summary:

mostly shallow to bedrock, a complex of limy very gravelly over extremely cobbly loams with little or no development associated with limestone, better developed extremely channery loams over extremely channery clays related to phyllite and lacking lime, and limy extremely gravelly loams associated with sandstone; unit dominated by Pima County soil survey map unit 42 (Mabray-Deloro-Rock outcrop complex, 25 to 60 percent slopes), 23 (Deloro-Andrada complex, 5 to 35 percent slopes), and 24 (Deloro-Rock outcrop complex, 15 to 60 percent slopes). These units comprise 42%, 9% and 5% of the ELT, respectively

Geologic Materials:

alluvium, colluvium and residuum associated with Escabrosa Limestone and Martin Formation (MDc); tectonites (P1s); Apache Group and Troy Quartzite (Middle Proterozoic) (Ya);Bolsa Quartzite and Abrigo Formation (Cba); and sandstone, siltstone and conglomerate, undivided (QTs) which comprise 31%, 22%, 19%, 15 % and 5% of the unit, respectively

Landforms:

moderately to finely dissected, moderately to deeply incised mountain slopes