Sections

Ecological Land Types within LTA 125.

ELT 125a

Description: 
Marshall Peak to Mt Lemmon, including Radio Ridge, Ski Valley, and upper Carter Canyon
Area: 
670 ha
Area in acres: 
1657 acres
Elevation Range
Minimum: 
2275 m
Minimum in ft: 
7463 ft
Maximum: 
2789 m
Maximum in ft: 
9151 ft
Median: 
2518 m
Median in ft: 
8261 ft
Soil Summary: 
detailed soil survey information is not available for this unit; correlates with GES unit 476 characterized by extremely cobbly sandy loams shallow to deep to granite or granite-like bedrock, acid soils lacking lime throughout, minimal soil development, and associated rock outcroppings
Geologic Materials: 
slope alluvium, colluvium and residuum associated with Bolsa Quartzite and Abrigo Formations (Cba), Middle Proterozoic Apache Group and Troy Quartzite (Ya) and Leatherwood quartz diorite (Kqdl). They comprise 72%, 17% and 5% of the unit, respectively
Landforms: 
moderately dissected mountain slopes with shallow to deep drainage incision

ELT 125b

Description: 
Inspiration Rock to Mt. Bigelow, including Bear Wallow
Area: 
311 ha
Area in acres: 
769 acres
Elevation Range
Minimum: 
2278 m
Minimum in ft: 
7475 ft
Maximum: 
2605 m
Maximum in ft: 
8546 ft
Median: 
2443 m
Median in ft: 
8015 ft
Soil Summary: 
detailed soil survey information is not available for this unit; correlates with GES unit 476 characterized by extremely cobbly sandy loams shallow to deep to granite or granite-like bedrock, acid soils lacking lime throughout, minimal soil development, and associated rock outcroppings
Geologic Materials: 
slope alluvium, colluvium and residuum associated with Middle Proterozoic Apache Group and Troy Quartzite (Ya). It comprises 95% of the unit
Landforms: 
moderately dissected mountain slopes with shallow to moderate drainage incision

An additional note on the ecological systems classification: LANDFIRE identifies much of this Madrean Pine-Oak Forest as “Southern Rocky Mountain Ponderosa Pine.” Although this is an accepted name, Nature Serve’s description places this ecological system to the north of our study area.

ELT 125c

Description: 
North slope from Sykes Knob to Mt. Bigelow
Area: 
159 ha
Area in acres: 
395 acres
Elevation Range
Minimum: 
2103 m
Minimum in ft: 
6901 ft
Maximum: 
2550 m
Maximum in ft: 
8365 ft
Median: 
2324 m
Median in ft: 
7625 ft
Soil Summary: 
detailed soil survey information is not available for this unit; correlates with GES unit 476 characterized by extremely cobbly sandy loams shallow to deep to granite or granite-like bedrock, acid soils lacking lime throughout, minimal soil development, and associated rock outcroppings
Geologic Materials: 
slope alluvium, colluvium and residuum associated with Middle Proterozoic Apache Group and Troy Quartzite (Ya) and unnamed granite (Twl). They comprise 88% and 11% of the unit, respectively
Landforms: 
moderately to finely dissected mountain slopes with shallow to moderate drainage incision

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