Ecological Land Type

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

Land Type Association: LTA 125

Ecological Unit: Mixed conifer forest on mountains derived mostly from metasedimentary rocks

Map with the ELT 125a polygon highlighted.

Landform position classes and corresponding vegetation*

Landform Class	Area	Percentage of ELT	Vegetation and notes
moderately moist steep slopes	234 ha	35	Doug fir/SW pine/Ponderosa pine and white fir/aspen
very moist steep slopes	202 ha	30	Doug fir/SW pine/Ponderosa pine and white fir/corkbark fir/aspen
moderately dry steep slopes	148 ha	22	Ponderosa pine/silverleaf oak/netleaf oak
very dry steep slopes	29 ha	4	Ponderosa pine/silverleaf oak/netleaf oak
gently sloping ridges and hills	26 ha	4	Doug fir/SW pine/Ponderosa pine/white fir
cool aspect scarps, cliffs, canyons	22 ha	3	Doug fir/SW pine/Ponderosa pine and white fir/aspen

Region 3 Mid-Scale Vegetation Cover Classes

Cover Class	Area	Percentage of ELT
Tree cc 30+%	483 ha	72
Sparsely vegetated, <10% vegetative cover (includes areas of high severity burns, 2002-03)	143 ha	21
Tree cc 10 - 29.9%	43 ha	6