Natural Resources
Conservation Service
Major Land Resource Area 120B
Major Land Resource Area
Accessed: 04/30/2026
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1
Select an ecological site
Select an ecological site using the list, keys, photos, briefcase, or quick search option located on this page. -
2
Explore the ecological site description
Next, learn more about the selected ecological site and its characteristic dynamics by browsing the ecological site description and exploring alternative state and transition model formats.
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precipitation
frost free days
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Viewing 15 of 15
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-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
-
i
Key Characteristics
- Not as above,
- Geology older (generally Mesozoic Era) or mixed ages associated with Sierra Nevada (beginning around Lake Oroville)
- Geology highly complex, interfingering of volcanic, sedimentary (metamorphozed), and some granitics. The break between MLRA 17 and MLRA 18 is more gradual than in the southern LRU's, lower foothill slopes gently to strongly sloping. (LRU I)
- Site not as above
- Site occurs on a hill or hillslope (various geologies)
- MAP is at least 18 inches
- MAP > 25 inches
- Not as above
- Site in a mesic STR
- Site on sideslopes and often steeper and/or north-facing (California black oak dominant tree and high density of shrubs and a few conifers)
Ecological site map
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Zoom in to display soil survey map units for an area of interest, and zoom out to display MLRAs. Select a map unit polygon to view ecological sites correlated to that map unit. View a brief description of an ecological site by clicking on its name in the map popup. Soil survey correlations may not be accurate, and ecological site classification of a location should always be verified in the field. Each selection may require the transfer of several hundred KB of data.
Briefcase
Add ecological sites and Major Land Resource Areas to your briefcase by clicking on the briefcase (
) icon wherever it occurs. Drag and drop items to reorder. Cookies are used to store briefcase items between browsing sessions. Because of this, the number of items that can be added to your briefcase is limited, and briefcase items added on one device and browser cannot be accessed from another device or browser. Users who do not wish to place cookies on their devices should not use the briefcase tool. Briefcase cookies serve no other purpose than described here and are deleted whenever browsing history is cleared.
Ecological sites
Major Land Resource Areas
Ecological site photos
Tools
Filter by
interactive key
precipitation
frost free days
more..
clear all
Type
Image size
Done
Filters
Interactive key
Precipitation
Frost free days
Elevation
Slope
Landform
Parent material origin
Parent material kind
Soil texture
Uplands
Upland Flats
F120BY014IN – Saturated Flats
F120BY014IN – Saturated Flats
Terraces
Floodplains
Loess
F120BY001IN – Loess Uplands
F120BY001IN – Loess Uplands
Fragipan
F120BY002IN – Fragipan Uplands
F120BY002IN – Fragipan Uplands
No Fragipan
Depth: Moderately Deep
F120BY005IN – Moderately Deep Sandstone-Shale Uplands
F120BY005IN – Moderately Deep Sandstone-Shale Uplands
Depth: Deep
Sandy or Loamy Skeletal
Deep, Well Drained Sandstone - Shale Uplands
F120BY007IN – Deep Well Drained Sandstone-Shale Uplands
F120BY007IN – Deep Well Drained Sandstone-Shale Uplands
Deep, Moderately Well Drained Sandstone-Shale Uplands
F120BY006IN – Deep Moderately Well Drained Sandstone-Shale Uplands
F120BY006IN – Deep Moderately Well Drained Sandstone-Shale Uplands
Loamy Skeletal Uplands
F120BY008IN – Loamy Skeletal Uplands
F120BY008IN – Loamy Skeletal Uplands
Sandy Dune Uplands
F120BY009IN – Sandy Dune Uplands
F120BY009IN – Sandy Dune Uplands
Well Drained
F120BY011IN – Well Drained Terraces
F120BY011IN – Well Drained Terraces
Moderately Well Drained and SWPD
F120BY013IN – Moist Terraces
F120BY013IN – Moist Terraces
Well Drained
Somewhat poorly drained to Moderately Well Drained
F120BY019IN – Moist Silty Alluvium
F120BY019IN – Moist Silty Alluvium
Poorly Drained
F120BY020IN – Wet Silty Alluvium
F120BY020IN – Wet Silty Alluvium
Loamy Alluvial Headwaters
F120BY015IN – Loamy Alluvial Headwaters
F120BY015IN – Loamy Alluvial Headwaters
Riverbank Loamy Alluvium
F120BY018IN – Riverbank Loamy Alluvium
F120BY018IN – Riverbank Loamy Alluvium
Well Drained Silty Alluvium
F120BY017IN – Well Drained Silty Alluvium
F120BY017IN – Well Drained Silty Alluvium
Long term average mean annual precipitation
- No filter
- 120 – 140cm (47 – 55in)
—
cm
Long term average frost free days
- No filter
- 150 – 170days
- 170 – 190days
—
days
- No filter
- 0 – 200m (0 – 700ft)
- 200 – 400m (700 – 1300ft)
—
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%
- 70 – 80%
—
%
- No filter
- Dune
- Flood plain
- Flood-plain step
- Hill
- Lake plain
- Loess hill
- Ridge
- Structural bench
- Terrace
- No filter
- Conglomerate, unspecified
- Sandstone and shale
- Sandstone and siltstone
- Sandstone, unspecified
- Shale, unspecified
- Siltstone, unspecified
- No filter
- Alluvium
- Colluvium
- Eolian sands
- Lacustrine deposits
- Loess
- Residuum
Soil surface texture
- No filter
- Loam
- Loamy fine sand
- Loamy sand
- Silty clay loam
- Silt loam
- Sandy loam
Print Options
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Ecological site keys
MLRA 120B
I.
Uplands
C.
No Fragipan
2.
Depth: Deep
i.
Deep, Well Drained Sandstone - Shale Uplands
... F120BY007IN – Deep Well Drained Sandstone-Shale Uplands
ii.
Deep, Moderately Well Drained Sandstone-Shale Uplands
... F120BY006IN – Deep Moderately Well Drained Sandstone-Shale Uplands
3.
Sandy or Loamy Skeletal
III.
Terraces
IV.
Floodplains
A.
Well Drained
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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