Ecological Land Types within LTA 203.

ELT 203a

Elevation Range

Minimum:

1509 m

Minimum in ft:

4950 ft

Maximum:

2463 m

Maximum in ft:

8082 ft

Median:

1815 m

Median in ft:

5955 ft

Soil Summary:

detailed soil survey information is incomplete for this unit; correlates with GES unit 475 characterized by extremely cobbly sandy loams shallow to granite or granite-like bedrock, acid soils lacking lime throughout, minimal soil development, and associated extensive rock outcroppings

Geologic Materials:

slope alluvium, colluvium and residuum associated mostly with the Catalina-Rincon igneous metamorphic complex (TXm) which comprises 100% of the unit, respectively

Landforms:

coarsely dissected mountain slopes with shallow drainage incision (numerous rock fractures; highly pervious)

ELT 203b

Elevation Range

Minimum:

1626 m

Minimum in ft:

5334 ft

Maximum:

2294 m

Maximum in ft:

7526 ft

Median:

1955 m

Median in ft:

6414 ft

Soil Summary:

dominant soils are shallow to moderately deep to bedrock, very flaggy sandy loam and gravelly fine sandy loam surfaces over very channery and flaggy sandy loams and very gravelly fine sandy sandy loams, no lime present, weak to moderate development (organic matter accumulation); unit dominated by Pima County soil survey map units 76 (Spudrock-Far-Rock outcrop complex, 25 to 65 percent slopes) and 75 (Spudrock-Boriana complex, 10 to 35 percent slopes). These units comprise 68% and 32% of the ELT, respectively

Geologic Materials:

slope alluvium, colluvium and residuum associated mostly with the Catalina-Rincon igneous metamorphic complex (TXm) which comprises 100% of the unit, respectively

Landforms:

coarsely to moderately dissected mountain slopes with shallow to moderate drainage incision (numerous rock fractures; highly pervious)