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197 - Torriorthents-Rock outcrop, sandstone con
<br />Map Unit Setting
<br />Major Land Resource Area: 34
<br />Elevation: 6,000 to 11,200 feet (1,829 to 3,438
<br />meters)
<br />Mean annual precipitation: 9 to 16 inches (229 to
<br />406 millimeters)
<br />Average annual air temperature: 42 to 48 degrees F
<br />(5.6 to 8.9 degrees C)
<br />Frost -free period: 75 to 105 days
<br />Note: This unit is 40 percent very shallow to shallow
<br />Torriorthents on backslopes, 20 percent moderately
<br />deep Torriorthents on backslopes, and 30 percent
<br />rock outcrop.
<br />Map Unit Composition
<br />Torriorthents and similar soils: 60 percent
<br />Rock outcrop 30 percent
<br />Minor components: 10 percent
<br />Component Descriptions
<br />Torriorthents soils
<br />Landform: Hills, mountainsides
<br />Position on landform: Backslope
<br />Parent material: Residuum and colluvium derived
<br />from sandstone and shale
<br />Slope: 25 to 75 percent
<br />Depth to restrictive feature: 4 to 30 inches to
<br />bedrock (paralithic); 4 to 30 inches to bedrock (lithic)
<br />Drainage Class: Well drained
<br />Available water capacity: About 1.5 inches (very
<br />low)
<br />Shrink -swell potential: About 1.5 percent (low)
<br />Hazard of flooding: None
<br />Torriorthents Soils
<br />Map Unit. 197
<br />Depth class: very shallow to moderately deep
<br />Drainage Class: well drained
<br />Slowest permeability. 0.6 to 2.0 in./hr. (moderate)
<br />Landform: breaks, canyons, hills, hillslopes,
<br />mountains, mountainsides
<br />Position on landform: backslopes, footslopes
<br />Parent material: colluvium and residuum derived
<br />from sandstone and shale, colluvium and/or
<br />residuum weathered from limestone and sandstone,
<br />residuum and colluvium derived from sandstone and
<br />shale, residuum derived from interbedded
<br />sandstone and shale, residuum derived from
<br />sandstone and shale, residuum derived from shale
<br />Elevation: 5,000 to 8,000 feet (1,524 to 2,438
<br />meters)
<br />Slope: 3 to 75 percent
<br />Climatic data:
<br />Mean annual precipitation: 9 to 16 inches
<br />(228 to 406 millimeters)
<br />Mean annual air temperature: 42 to 48
<br />degrees F (5.6 to 8.9 degrees C)
<br />vsr-, �e pori dT 75 to- 105 days
<br />Taxonomic class: Torriorthents
<br />ex, 25 to 75 percent slopes
<br />Depth to seasonal high water table: Greater than 72 in.
<br />Runoff class: Very high
<br />Calcium carbonate maximum: About 10 percent
<br />Gypsum maximum: None
<br />Salinity maximum: About 0 mmhos/cm (nonsaline)
<br />Sodium adsorption ratio: About 0 (nonsodic)
<br />Ecological site:
<br />Potential native vegetation: Indian ricegrass, Wyoming big
<br />sagebrush, bluebunch wheatgrass, western wheatgrass,
<br />antelope bitterbrush, needle and thread, true mountain
<br />mahogany
<br />Land capability subclass: (nonirrigated) 7e
<br />Typical profile
<br />0 to 2 inches - channery sandy loam
<br />2 to 14 inches - channery clay loam
<br />14 to 18 inches - unweathered bedrock
<br />Rock outcrop
<br />Description: Rock outcrop is mainly vertical sandstone or
<br />limestone ledges and exposed soft shale.
<br />Slope: 25 to 99 percent
<br />Depth to restrictive feature: 0 inches to bedrock (lithic)
<br />Available water capacity. About 0.0 inches (very low)
<br />Runoff class: Very high
<br />Salinity maximum: About 0 mmhos/cm (nonsaline)
<br />Land capability subclass: (nonirrigated) 8
<br />Deep loamy soils and similar soils
<br />Composition: About 10 percent
<br />Landform: Hillslopes
<br />Position on landform: Footslope
<br />Map Unit in which located. Torriorthents-Rock outcrop,
<br />sandstone, complex, 25 to 75 percent slopes
<br />A - 0 to 2 inches; light gray (5Y 7/1) channery sandy loam,
<br />very dark grayish brown (2.4Y 3/2) moist; weak fine and
<br />medium granular structure; slightly soft, very friable, sticky
<br />and plastic; 20 percent channers, mildly alkaline; abrupt
<br />wavy boundary.
<br />C2 - 2 to 14 inches; light gray (2.5Y 7/2) very channery
<br />sandy loam, light brownish gray (2.5Y 6/1) moist; massive
<br />structure; soft, slightly sticky and nonplastic; 10 percent
<br />gravel, 20 percent channers, 10 percent flagstones;
<br />slightly effervescent; mildly alkaline; abrupt smooth
<br />boundary.
<br />R - 14 inches plus, pale yellow (2.5Y 8/4) calcareous
<br />medium grained sandstone.
<br />Range in Characteristics
<br />Particle -size control section (weighted average)
<br />Rock fragment content: 15 to 60 percent
<br />Depth to effenwescence: n to 10 inches
<br />Depth to lithic or paralithic contact: 4 to 30 inches
<br />Hue: 2.5Y through 5Y
<br />Texture: sandy loam, loam, sandy clay loam, clay loam,
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