Natural Resources
Conservation Service
Major Land Resource Area 049X
Major Land Resource Area
Accessed: 04/24/2026
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Description
MLRA 49 represents the eastern foothills of the Rocky Mountains. Traditionally it has covered portions of the lower elevation Rocky Mountains consisting of the hog back and strike valley and the highest elevations of the Great Plains such as the Palmer divide.
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:Colorado MLRA 49 Key to Ecological Sites and Zones (i.e. LRU’s) Ecological site ID numbers with XB and XY sites at this time (2020) are generic sites and used across MLRA 49 in Colorado.
LRU A located in Wyoming - See Wyoming MLRA 49 Key (Key 1)
LRU B – Mesic and Frigid (MAAT42-50 degrees F), Aridic Ustic and Typic Ustic (MAP 13-19 inches); Freeze Free days 75-155; Elevation 5, 200-7,00 feet; Narrow hogback bands from WY/CO state line to Fort Collins (Larimer, Boulder and Jefferson counties) on Pierre Shale, Dakota, Morrison, Lykins and Fountain Formations; and western Elbert and northeastern El Paso on Dawson and White River Formation.
LRU C - Frigid (MAAT 45-47 degrees F), Typic Ustic, (MAP 16-20 inches), Freeze Free days 90-150, elevation 5,400-7,500 feet); Black Forest Area (Douglas County) Dawson and White River formation; West of Colorado Spring including Monument Hill and Palmer Divide (El Paso County) Pierre Shale, Laramie and Fox Hill Sandstone, and Denver Formation.
LRU D - Frigid (MAAT 40-46 degrees F), Ustic Aridic (MAP 11-14 inches), Freeze Free days 90-150, elevation 5,500-7,200 FT; Gardner Area (northern Huerfano County) & Huerfano & Farisita Formations; West of Canon City & Howard (Southwestern Pueblo county) & metamorphic quartz, monzonite, gneiss & schist with lesser amounts of igneous granite & diorite; Southwestern El Paso (Fountain, Morrison & Dakota Formations); & Arkansas River Canyon-West of Pueblo to near Salida
LRU E – Mesic and Frigid (MAAT 42-50 degrees F), Ustic Aridic and Typic Ustic (MAP 15-18inches), Freeze Free days 70-120, elevation 6,500-8,500 feet; West of Trinidad and Southern Huerfano County (Ration Formation); North part (Purgatoire River Watershed Area) Las Animas and southwestern Huerfano Counties (Poison Canyon Sandstone).
Site in a lowland position that receives significant additional moisture from runoff of adjacent slopes or from intermittent/perennial streams or a water table (HIGH Productivity Potential)
Soil depth very shallow (<10”), shallow (10-20”) OR moderately deep to deep (>20”) reacting like shallow soils due to root restrictive layer or on south and west facing slopes (LOW productivity potential)
Soil depth moderately deep to deep (>20”) without root restricting layer that inhibits the productivity potential
Site receives no extra water beyond normal precipitation
Site receives extra water beyond normal precipitation through high water table, riparian area, or run-in water
Site has bedrock within 20 inches of the soil surface
Site not as above
Bedrock shale
R049XB212CO – Shaly Foothill
R049XB212CO – Shaly Foothill
Site not as above
Bedrock basalt, limestone or sandstone
R049XB204CO – Shallow Foothill
R049XB204CO – Shallow Foothill
Site not as above - Not Applicable
Site influenced by rock fragments (fragments on surface or in the surface horizon, >15% rock fragments in surface horizon)
Site not as above
Site is predominantly stones and/or boulders (>10 inches in diameter) Stony Foothill (formerly Rocky Foothill)
R049XY206CO – Stony Foothill
R049XY206CO – Stony Foothill
Site not as above
Site has predominantly cobbles (3-10 inches in diameter)
R049XY213CO – Cobbly Foothill
R049XY213CO – Cobbly Foothill
Site not as above
Site is predominantly gravel (≤ 3 inches in diameter)
R049XY214CO – Gravelly Foothill
R049XY214CO – Gravelly Foothill
Site not as above - Not Applicable
Coarse-loamy or sandy family particle size and has surface textures of fine sandy loam, loamy sand, or sand
R049XB210CO – Sandy Foothill
R049XB210CO – Sandy Foothill
Site not as above
Fine family particle size and has surface textures of clay loam, clay, silty clay, or silty clay loam
R049XB208CO – Clayey Foothill
R049XB208CO – Clayey Foothill
Site not as above
Fine-loamy family particle size and has surface texture of loam, silt loam or fine sandy loam and 20-60 inches in depth
R049XB202CO – Loamy Foothill
R049XB202CO – Loamy Foothill
Site not as above
Family particle size varies. Surface textures are sandy loam and loam and soil depth is greater than 60 inches
EX049X01X220 – Ponderosa Loam Palmer Divide Palmer Divide
EX049X01X220 – Ponderosa Loam Palmer Divide Palmer Divide
Site not as above - Not Applicable
Site is in the fine-loamy/loamy family particle size
R049XY036CO – Overflow
R049XY036CO – Overflow
Site not as above
Site is sandy or coarse-loamy family particle size
R049XY031CO – Sandy Bottomland
R049XY031CO – Sandy Bottomland
Site not as above - Not Applicable
Site receives no extra water beyond normal precipitation
Site receives extra water beyond normal precipitation through high water table, riparian area, or run-in water
Site has bedrock within 20 inches of the soil surface
Site not as above
Bedrock shale
R049XB212CO – Shaly Foothill
R049XB212CO – Shaly Foothill
Site not as above
Bedrock limestone or sandstone
EX049X01X204 – Shallow Foothill Palmer Divide
EX049X01X204 – Shallow Foothill Palmer Divide
Site not as above - Not Applicable
Site influenced by rock fragments (fragments on surface or in the surface horizon, >15% rock fragments in surface horizon)
Site not as above
Site is predominantly stones and/or boulders (≥10 inches) Stony Foothill (formerly Rocky Foothill)
R049XY206CO – Stony Foothill
R049XY206CO – Stony Foothill
Site not as above
Site have predominantly cobbles (3-10 inches)
R049XY213CO – Cobbly Foothill
R049XY213CO – Cobbly Foothill
Site not as above
Site is predominantly gravel (< 3 inches in size)
R049XY214CO – Gravelly Foothill
R049XY214CO – Gravelly Foothill
Site not as above - Not Applicable
Site has surface textures of sandy loam, loamy sand, or sand. There are 2 choices for this node - Sandy Foothill or Sandy Divide.
Site not as above
Effective precipitation ranges from 12-16 inches
EX049X01X210 – Sandy Foothill Palmer Divide
EX049X01X210 – Sandy Foothill Palmer Divide
Effective precipitation ranges from 16-19 inches
R049XY216CO – Sandy Divide
R049XY216CO – Sandy Divide
Site has surface textures of clay loam, clay, silty clay, or silty clay loam and residuum, alluvium from shale or slope alluvium from shale
EX049X01X208 – Clayey Foothill Palmer Divide
EX049X01X208 – Clayey Foothill Palmer Divide
Site not as above
Site has surface texture of loam
EX049X01X202 – Loamy Foothill Palmer Divide
EX049X01X202 – Loamy Foothill Palmer Divide
Site not as above
Family particle size varies. Surface textures are sandy loam and loam and soil depth is greater than 60 inches
EX049X01X220 – Ponderosa Loam Palmer Divide Palmer Divide
EX049X01X220 – Ponderosa Loam Palmer Divide Palmer Divide
Site not as above - Not Applicable
Site is in the fine-loamy/loamy in family particle size control section
R049XY036CO – Overflow
R049XY036CO – Overflow
Site not as above
Site is sandy or coarse-loamy in the family particle size control section
R049XY031CO – Sandy Bottomland
R049XY031CO – Sandy Bottomland
Site not as above - Not Applicable
Site receive additional run-on moisture. Site is subject to flooding (rare, occasional, frequent, or very frequent)
R049XY036CO – Overflow
R049XY036CO – Overflow
Site not as above
Site have bedrock within 20 inches of the soil surface
Site not as above
Bedrock shale
R049XB212CO – Shaly Foothill
R049XB212CO – Shaly Foothill
Site not as above
Bedrock limestone or sandstone
R049XB204CO – Shallow Foothill
R049XB204CO – Shallow Foothill
Site is not as above - Not Applicable
Site influenced by rock fragments (fragments on surface or in the surface horizon; >15% rock fragments in surface horizon). Note Cobbly Foothills and Gravelly Foothills have been correlated to soil map unit very inconsistently in the past)
Site not as above
Site have predominantly cobbles (3-10 inches)
R049XY213CO – Cobbly Foothill
R049XY213CO – Cobbly Foothill
Site not as above
Site have predominantly gravel ≤ 3 inches in size
R049XY214CO – Gravelly Foothill
R049XY214CO – Gravelly Foothill
Site is not as above - Not Applicable
Site have surface textures of sandy loam, loamy sand, or sand
R049XB210CO – Sandy Foothill
R049XB210CO – Sandy Foothill
Site not as above
Site has surface textures of clay loam derived from calcareous clayey alluvium and deep (60-80 inches) in depth; fine family particle size
R049XB208CO – Clayey Foothill
R049XB208CO – Clayey Foothill
Site not as above
Site have surface textures of clay loam, clay, silty clay, or silty clay loam; moderately deep to deep (20-100 inches in depth)
R049XY004CO – Loamy Plains
R049XY004CO – Loamy Plains
Site not as above
Site have surface texture of loam
R049XD202CO – Loamy Foothill 11-14 PZ
R049XD202CO – Loamy Foothill 11-14 PZ
Site is not as above - Not Applicable
Site has surface textures of clay loam, or silty clay loam; shallow to moderately deep (8-40 inches) in depth; clayey and fine family particle size
R049XE223CO – Shrubby Foothill
R049XE223CO – Shrubby Foothill
Site not as above
Site has surface textures of clay loam derived from calcareous clayey alluvium and deep (60-80 inches) in depth; fine family particle size
R049XY004CO – Loamy Plains
R049XY004CO – Loamy Plains
Site not as above - Not written
Site poorly drained with water table above surface part of growing season, Nebraska sedge, northern reedgrass, tufted hairgrass, and willows common species
R049XA178WY – Wetland (Foothills and Mountains Southeast)
R049XA178WY – Wetland (Foothills and Mountains Southeast)
Site not as above
Water table within rooting depth of herbaceous species (typically above 20”) during part of the growing season, tufted hairgrass, Nebraska sedge, shrubby cinquefoil, sedges, rushes, and willow common
R049XA174WY – Subirrigated (Foothills and Mountains Southeast)
R049XA174WY – Subirrigated (Foothills and Mountains Southeast)
Site receives periodic overflow from adjacent slopes, but without a water table within rooting depth of woody plants, and soil textures are loamy, serviceberry, silver sagebrush, slender wheatgrass, and basin wildrye common
R049XA126WY – Loamy Overflow (Foothills and Mountains Southeast)
R049XA126WY – Loamy Overflow (Foothills and Mountains Southeast)
Soils very shallow (<10”), but may include areas of exposed bedrock and pockets of deep soil, often on steep (up to 55%) south and west facing slopes with VERY LOW productivity potential
Soils shallow (10-20” (25-50cm)), but may include moderately deep to deep (>20” (>50cm)) skeletal soils on south and west aspects, >15% slopes, productivity potential is LOW
Bedrock igneous or volcanic, three-tip sagebrush, antelope bitterbrush, and black sage common shrubs
R049XA116WY – Igneous (Foothills and Mountains Southeast)
R049XA116WY – Igneous (Foothills and Mountains Southeast)
Fractured bedrock of various types except igneous or volcanic, commonly on windswept ridges, bluebunch wheatgrass, Columbia needlegrass and a variety of shrub species dominate
R049XA176WY – Very Shallow (Foothills and Mountains Southeast)
R049XA176WY – Very Shallow (Foothills and Mountains Southeast)
Site with a highly calcareous subsoil (<10” (25cm)), often gravelly or skeletal subsoil OR underlain by soft calcareous materials and slopes >15%
Soils not as above
Shallow sandy and loamy soils (10-20” (25-50cm)), often cobbly or channery with slopes >35%, underlain by soft calcareous materials with many outcrops of sedimentary rock (often associated with Lime Stone parent material) , mountain mahogany, bluebunch wheatgrass, Indian ricegrass common
R049XA134WY – Rocky Hills (Foothills and Mountains Southeast)
R049XA134WY – Rocky Hills (Foothills and Mountains Southeast)
Medium to moderately coarse textured soils over igneous or volcanic bedrock, bitterbrush, black sage and three-tip sagebrush common
R049XA160WY – Shallow Igneous (Foothills and Mountains Southeast)
R049XA160WY – Shallow Igneous (Foothills and Mountains Southeast)
Very fine sandy loam to clay loam textured soils over various bedrock types (commonly limestone, siltstone, or shale), black sagebrush or mountain mahogany intermixed with big sage
R049XA162WY – Shallow Loamy (Foothills and Mountains Southeast)
R049XA162WY – Shallow Loamy (Foothills and Mountains Southeast)
Sites with a high volume of coarse fragments in top 20” (>35% by volume) Site occurs in a variety of upland positions, boulders found in abundance on surface, Columbia needlegrass, Idaho fescue, spike fescue, bitterbrush, and big sage, productivity less than others in group
R049XA108WY – Coarse Upland (Foothills and Mountains Southeast)
R049XA108WY – Coarse Upland (Foothills and Mountains Southeast)
Sites without high volume of coarse fragments
Soils very fine sandy loams to clay loams, a good variety and even mix of grass species, mountain big sagebrush dominant shrub
R049XA122WY – Loamy (Foothills and Mountains Southeast)
R049XA122WY – Loamy (Foothills and Mountains Southeast)
Long term average mean annual precipitation
- No filter
- 30 – 35cm (12 – 14in)
- 35 – 40cm (14 – 16in)
- 40 – 50cm (16 – 20in)
- 50 – 60cm (20 – 24in)
- 60 – 80cm (24 – 31in)
- 80 – 100cm (31 – 39in)
- 100 – 120cm (39 – 47in)
- 120 – 140cm (47 – 55in)
- 140 – 500cm (55 – 197in)
—
cm
Long term average frost free days
- No filter
- 90 – 110days
- 110 – 130days
- 130 – 150days
- 150 – 170days
—
days
- No filter
- 1400 – 1600m (4600 – 5200ft)
- 1600 – 1800m (5200 – 5900ft)
- 1800 – 2000m (5900 – 6600ft)
- 2000 – 2200m (6600 – 7200ft)
- 2200 – 2400m (7200 – 7900ft)
- 2400 – 2600m (7900 – 8500ft)
—
m
- No filter
- 0 – 3%
- 3 – 5%
- 5 – 10%
- 10 – 15%
- 15 – 20%
- 20 – 25%
- 25 – 30%
- 30 – 35%
- 35 – 40%
- 40 – 45%
- 45 – 50%
- 50 – 60%
- 60 – 70%
—
%
- No filter
- Alluvial fan
- Cuesta
- Drainageway
- Escarpment
- Fan
- Fan remnant
- Fan terrace
- Flat
- Flood plain
- Hill
- Hillside
- Hillslope
- Hogback
- Lava plateau
- Mesa
- Mountain slope
- Mountainside
- Oxbow
- Pediment
- Plateau
- Ridge
- Scarp
- Stream terrace
- Terrace
- Upland slope
- Valley
- Valley floor
- Valley side
- No filter
- Arkose
- Basalt
- Granite and gneiss
- Igneous and metamorphic
- Limestone and shale
- Limestone, sandstone and shale
- Limestone, unspecified
- Sandstone and shale
- Sandstone, unspecified
- Sedimentary, unspecified
- Shale and siltstone
- Shale, calcareous
- Shale, clayey
- Shale, unspecified
- Siltstone, unspecified
- No filter
- Alluvium
- Colluvium
- Eolian deposits
- Eolian sands
- Residuum
- Slope alluvium
Soil surface texture
- No filter
- Clay
- Clay loam
- Coarse sandy loam
- Fine sandy loam
- Loam
- Loamy coarse sand
- Loamy fine sand
- Loamy sand
- Silty clay loam
- Silt loam
- Sandy loam
- Very fine sandy loam
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Ecological site keys
ESD Key MLRA 49X Wyoming
I.
Site in a lowland position that receives significant additional moisture from runoff of adjacent slopes or from intermittent/perennial streams or a water table (HIGH Productivity Potential)
A.
Site poorly drained with water table above surface part of growing season, Nebraska sedge, northern reedgrass, tufted hairgrass, and willows common species
... R049XA178WY – Wetland (Foothills and Mountains Southeast)
B.
Site not as above
1
Water table within rooting depth of herbaceous species (typically above 20”) during part of the growing season, tufted hairgrass, Nebraska sedge, shrubby cinquefoil, sedges, rushes, and willow common
... R049XA174WY – Subirrigated (Foothills and Mountains Southeast)
2
Site receives periodic overflow from adjacent slopes, but without a water table within rooting depth of woody plants, and soil textures are loamy, serviceberry, silver sagebrush, slender wheatgrass, and basin wildrye common
... R049XA126WY – Loamy Overflow (Foothills and Mountains Southeast)
II.
Soil depth very shallow (<10”), shallow (10-20”) OR moderately deep to deep (>20”) reacting like shallow soils due to root restrictive layer or on south and west facing slopes (LOW productivity potential)
A.
Soils very shallow (<10”), but may include areas of exposed bedrock and pockets of deep soil, often on steep (up to 55%) south and west facing slopes with VERY LOW productivity potential
1
Bedrock igneous or volcanic, three-tip sagebrush, antelope bitterbrush, and black sage common shrubs
... R049XA116WY – Igneous (Foothills and Mountains Southeast)
2
Fractured bedrock of various types except igneous or volcanic, commonly on windswept ridges, bluebunch wheatgrass, Columbia needlegrass and a variety of shrub species dominate
... R049XA176WY – Very Shallow (Foothills and Mountains Southeast)
B.
Soils shallow (10-20” (25-50cm)), but may include moderately deep to deep (>20” (>50cm)) skeletal soils on south and west aspects, >15% slopes, productivity potential is LOW
1
Site with a highly calcareous subsoil (<10” (25cm)), often gravelly or skeletal subsoil OR underlain by soft calcareous materials and slopes >15%
i.
Shallow sandy and loamy soils (10-20” (25-50cm)), often cobbly or channery with slopes >35%, underlain by soft calcareous materials with many outcrops of sedimentary rock (often associated with Lime Stone parent material) , mountain mahogany, bluebunch wheatgrass, Indian ricegrass common
... R049XA134WY – Rocky Hills (Foothills and Mountains Southeast)
2
Soils not as above
i.
Medium to moderately coarse textured soils over igneous or volcanic bedrock, bitterbrush, black sage and three-tip sagebrush common
... R049XA160WY – Shallow Igneous (Foothills and Mountains Southeast)
ii.
Very fine sandy loam to clay loam textured soils over various bedrock types (commonly limestone, siltstone, or shale), black sagebrush or mountain mahogany intermixed with big sage
... R049XA162WY – Shallow Loamy (Foothills and Mountains Southeast)
III.
Soil depth moderately deep to deep (>20”) without root restricting layer that inhibits the productivity potential
A.
Sites with a high volume of coarse fragments in top 20” (>35% by volume) Site occurs in a variety of upland positions, boulders found in abundance on surface, Columbia needlegrass, Idaho fescue, spike fescue, bitterbrush, and big sage, productivity less than others in group
... R049XA108WY – Coarse Upland (Foothills and Mountains Southeast)
B.
Sites without high volume of coarse fragments
1
Soils very fine sandy loams to clay loams, a good variety and even mix of grass species, mountain big sagebrush dominant shrub
... R049XA122WY – Loamy (Foothills and Mountains Southeast)
MLRA 49 Key - Colorado
Note
:Colorado MLRA 49 Key to Ecological Sites and Zones (i.e. LRU’s) Ecological site ID numbers with XB and XY sites at this time (2020) are generic sites and used across MLRA 49 in Colorado.
A.
LRU A located in Wyoming - See Wyoming MLRA 49 Key (Key 1)
B.
LRU B – Mesic and Frigid (MAAT42-50 degrees F), Aridic Ustic and Typic Ustic (MAP 13-19 inches); Freeze Free days 75-155; Elevation 5, 200-7,00 feet; Narrow hogback bands from WY/CO state line to Fort Collins (Larimer, Boulder and Jefferson counties) on Pierre Shale, Dakota, Morrison, Lykins and Fountain Formations; and western Elbert and northeastern El Paso on Dawson and White River Formation.
1a.
Site receives no extra water beyond normal precipitation
4a.
Site has bedrock within 20 inches of the soil surface
5b.
Site not as above
6b.
Site not as above - Not Applicable
4b.
Site not as above
7a.
Site influenced by rock fragments (fragments on surface or in the surface horizon, >15% rock fragments in surface horizon)
8a.
Site is predominantly stones and/or boulders (>10 inches in diameter) Stony Foothill (formerly Rocky Foothill)
... R049XY206CO – Stony Foothill
8b.
Site not as above
9b.
Site not as above
10b.
Site not as above - Not Applicable
7b.
Site not as above
11a.
Coarse-loamy or sandy family particle size and has surface textures of fine sandy loam, loamy sand, or sand
... R049XB210CO – Sandy Foothill
11b.
Site not as above
12a.
Fine family particle size and has surface textures of clay loam, clay, silty clay, or silty clay loam
... R049XB208CO – Clayey Foothill
12b.
Site not as above
13a.
Fine-loamy family particle size and has surface texture of loam, silt loam or fine sandy loam and 20-60 inches in depth
... R049XB202CO – Loamy Foothill
13b.
Site not as above
14a.
Family particle size varies. Surface textures are sandy loam and loam and soil depth is greater than 60 inches
... EX049X01X220 – Ponderosa Loam Palmer Divide Palmer Divide
14b.
Site not as above - Not Applicable
1b.
Site receives extra water beyond normal precipitation through high water table, riparian area, or run-in water
2b.
Site not as above
3b.
Site not as above - Not Applicable
C.
LRU C - Frigid (MAAT 45-47 degrees F), Typic Ustic, (MAP 16-20 inches), Freeze Free days 90-150, elevation 5,400-7,500 feet); Black Forest Area (Douglas County) Dawson and White River formation; West of Colorado Spring including Monument Hill and Palmer Divide (El Paso County) Pierre Shale, Laramie and Fox Hill Sandstone, and Denver Formation.
1a.
Site receives no extra water beyond normal precipitation
4a.
Site has bedrock within 20 inches of the soil surface
5b.
Site not as above
6b.
Site not as above - Not Applicable
4b.
Site not as above
7a.
Site influenced by rock fragments (fragments on surface or in the surface horizon, >15% rock fragments in surface horizon)
8a.
Site is predominantly stones and/or boulders (≥10 inches) Stony Foothill (formerly Rocky Foothill)
... R049XY206CO – Stony Foothill
8b.
Site not as above
9b.
Site not as above
10b.
Site not as above - Not Applicable
7b.
Site not as above
11a.
Site has surface textures of sandy loam, loamy sand, or sand. There are 2 choices for this node - Sandy Foothill or Sandy Divide.
11b.
Site not as above
12a.
Site has surface textures of clay loam, clay, silty clay, or silty clay loam and residuum, alluvium from shale or slope alluvium from shale
... EX049X01X208 – Clayey Foothill Palmer Divide
12b.
Site not as above
13b.
Site not as above
14a.
Family particle size varies. Surface textures are sandy loam and loam and soil depth is greater than 60 inches
... EX049X01X220 – Ponderosa Loam Palmer Divide Palmer Divide
14b.
Site not as above - Not Applicable
1b.
Site receives extra water beyond normal precipitation through high water table, riparian area, or run-in water
2a.
Site is in the fine-loamy/loamy in family particle size control section
... R049XY036CO – Overflow
2b.
Site not as above
3a.
Site is sandy or coarse-loamy in the family particle size control section
... R049XY031CO – Sandy Bottomland
3b.
Site not as above - Not Applicable
D.
LRU D - Frigid (MAAT 40-46 degrees F), Ustic Aridic (MAP 11-14 inches), Freeze Free days 90-150, elevation 5,500-7,200 FT; Gardner Area (northern Huerfano County) & Huerfano & Farisita Formations; West of Canon City & Howard (Southwestern Pueblo county) & metamorphic quartz, monzonite, gneiss & schist with lesser amounts of igneous granite & diorite; Southwestern El Paso (Fountain, Morrison & Dakota Formations); & Arkansas River Canyon-West of Pueblo to near Salida
1a.
Site receive additional run-on moisture. Site is subject to flooding (rare, occasional, frequent, or very frequent)
... R049XY036CO – Overflow
1b.
Site not as above
2a.
Site have bedrock within 20 inches of the soil surface
3b.
Site not as above
4b.
Site is not as above - Not Applicable
2b.
Site not as above
5a.
Site influenced by rock fragments (fragments on surface or in the surface horizon; >15% rock fragments in surface horizon). Note Cobbly Foothills and Gravelly Foothills have been correlated to soil map unit very inconsistently in the past)
6b.
Site not as above
7b.
Site is not as above - Not Applicable
5b.
Site not as above
8b.
Site not as above
9a.
Site has surface textures of clay loam derived from calcareous clayey alluvium and deep (60-80 inches) in depth; fine family particle size
... R049XB208CO – Clayey Foothill
9b.
Site not as above
10a.
Site have surface textures of clay loam, clay, silty clay, or silty clay loam; moderately deep to deep (20-100 inches in depth)
... R049XY004CO – Loamy Plains
10b.
Site not as above
11b.
Site is not as above - Not Applicable
E.
LRU E – Mesic and Frigid (MAAT 42-50 degrees F), Ustic Aridic and Typic Ustic (MAP 15-18inches), Freeze Free days 70-120, elevation 6,500-8,500 feet; West of Trinidad and Southern Huerfano County (Ration Formation); North part (Purgatoire River Watershed Area) Las Animas and southwestern Huerfano Counties (Poison Canyon Sandstone).
1a.
Site has surface textures of clay loam, or silty clay loam; shallow to moderately deep (8-40 inches) in depth; clayey and fine family particle size
... R049XE223CO – Shrubby Foothill
1b.
Site not as above
2a.
Site has surface textures of clay loam derived from calcareous clayey alluvium and deep (60-80 inches) in depth; fine family particle size
... R049XY004CO – Loamy Plains
2b.
Site not as above - Not written
The Ecosystem Dynamics Interpretive Tool is an information system framework developed by the USDA-ARS Jornada Experimental Range, USDA Natural Resources Conservation Service, and New Mexico State University.
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