Major Land Resource Area 134X
Southern Mississippi Valley Loess
Accessed: 12/21/2024
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i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Hills physiographic subsection
- Backslopes (greater than 12 percent slopes)
- Crowley’s Ridge uplands
- Loess greater than 4 feet thick
- No fragipan
- Backslopes greater than 12 percent slopes
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-
i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Hills physiographic subsection
- Summits (less than 12 percent slopes)
- Crowley’s Ridge uplands
- Loess greater than 4 feet thick
- No fragipan
- Summits less than 12 percent slopes
-
i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Plains physiographic subsection
- No restrictive layers or episaturation
- Slopes less than 8 percent
- Interfluves/divides
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-
i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Plains physiographic subsection
- Restrictive layers (fragipan) or episaturation
- Interfluves/divides (uplands)
- Drainage poor (SWPD/PD)
- Somewhat poorly drained
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-
i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Plains physiographic subsection
- Restrictive layers (fragipan) or episaturation
- Interfluves/divides (uplands)
- Drainage poor (SWPD/PD)
- Poorly drained
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-
i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Plains physiographic subsection
- No restrictive layers or episaturation
- Slopes greater than 8 percent
-
i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Plains physiographic subsection
- No restrictive layers or episaturation
- Slopes less than 8 percent
- Terraces
-
i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Plains physiographic subsection
- Restrictive layers (fragipan) or episaturation
- Terraces
- Drainage poor (SWPD/PD)
- Somewhat poorly drained
-
i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Plains physiographic subsection
- Restrictive layers (fragipan) or episaturation
- Terraces
- Drainage poor (SWPD/PD)
- Poorly drained
- No ponding
- Natric soils
-
i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Plains physiographic subsection
- Restrictive layers (fragipan) or episaturation
- Terraces
- Drainage poor (SWPD/PD)
- Poorly drained
- No ponding
- Absence of natric horizons
-
i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Plains physiographic subsection
- Restrictive layers (fragipan) or episaturation
- Terraces
- Drainage poor (SWPD/PD)
- Poorly drained
- Ponded depressions
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-
i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Plains physiographic subsection
- Restrictive layers (fragipan) or episaturation
- Interfluves/divides (uplands)
- Moderately well drained (fragipan)
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-
i
Key Characteristics
- North of Big Black River
- Parent material loess
- Loess Plains physiographic subsection
- Restrictive layers (fragipan) or episaturation
- Terraces
- Moderately well drained (fragipan)
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-
i
Key Characteristics
- North of Big Black River
- Parent material alluvium
- Soils non-acid reaction class (typically associated with floodplains in deep loess landscapes – e.g., Loess Hills)
- Well to moderately well drained
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-
i
Key Characteristics
- North of Big Black River
- Parent material alluvium
- Soils non-acid reaction class (typically associated with floodplains in deep loess landscapes – e.g., Loess Hills)
- Drainage poor (SWPD/PD)
- Somewhat poorly drained
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-
i
Key Characteristics
- North of Big Black River
- Parent material alluvium
- Soils non-acid reaction class (typically associated with floodplains in deep loess landscapes – e.g., Loess Hills)
- Drainage poor (SWPD/PD)
- Poorly drained
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-
i
Key Characteristics
- North of Big Black River
- Parent material alluvium
- Soils acid reaction class
- Soil drainage well to excessive (natural levees)
- Excessively drained
-
i
Key Characteristics
- North of Big Black River
- Parent material alluvium
- Soils acid reaction class
- Soil drainage well to excessive (natural levees)
- Well to moderately well drained
-
i
Key Characteristics
- North of Big Black River
- Parent material alluvium
- Soils acid reaction class
- Soil drainage poor (level to depressional floodplains)
- Somewhat poorly drained
-
i
Key Characteristics
- North of Big Black River
- Parent material alluvium
- Soils acid reaction class
- Soil drainage poor (level to depressional floodplains)
- Poorly drained
- Level floodplain (not ponded)
-
i
Key Characteristics
- North of Big Black River
- Parent material alluvium
- Soils acid reaction class
- Soil drainage poor (level to depressional floodplains)
- Poorly drained
- Ponded depressions
-
i
Key Characteristics
- South of Big Black River
- Alluvium
- Acid
- Drainageways
- Somewhat Poorly Drained
- Silty
- South of Big Black River
- Alluvium
- Acid
- Drainageways
- Poorly Drained
- Entic/Inceptic soil Orders
- Silty
-
i
Key Characteristics
- South of Big Black River
- Alluvium
- Non-Acid
- Drainageways
- Well Drained, Moderately Well Drained
- South of Big Black River
- Alluvium
- Acid
- Natural Levee
- Excessively Drained, Well Drained, Moderately Well Drained
- Loamy
- South of Big Black River
- Alluvium
- Acid
- Drainageways
- Well Drained, Moderately Well Drained
- Silty
-
i
Key Characteristics
- South of Big Black River
- Loess
- 74c Southern Rolling Plains
- No Fragipan
- Loess greater than 4 feet thick
- Terrace
- Less than 8% Slope
- Poorly Drained
- No Ponding
- Natric
- South of Big Black River
- Loess
- 74c Southern Rolling Plains
- No Fragipan
- Loess greater than 4 feet thick
- Terrace
- Less than 8% Slope
- Poorly Drained
- No Ponding
- Not Natric
- South of Big Black River
- Loess
- 74c Southern Rolling Plains
- Fragipan
- Loess greater than 4 feet thick
- Interfluve
- Less than 8% Slope
- Somewhat Poorly Drained
- South of Big Black River
- Loess over Marine Sediments
- Southern Rolling Plains
- Fragipan
- Loess 2 - 4 feet thick
- Terrace
- Greater than 8% Slope
- Moderately Well Drained, Somewhat Poorly Drained
-
i
Key Characteristics
- South of Big Black River
- Loess
- 74c Southern Rolling Plains
- Fragipan
- Loess greater than 4 feet thick
- Interfluve
- Less than 8% Slope
- Moderately Well Drained
- South of Big Black River
- Loess
- 74c Southern Rolling Plains
- Fragipan
- Loess greater than 4 feet thick
- Sideslope
- Greater than 8% Slope
- Moderately Well Drained
- South of Big Black River
- Loess
- 74c Southern Rolling Plains
- Fragipan
- Loess greater than 4 feet thick
- Terrace
- Less than 8% Slope
- Moderately Well Drained
- South of Big Black River
- Loess over Marine Sediments
- Southern Rolling Plains
- Fragipan
- Loess 2 - 4 feet thick
- Summit
- Less than 8% Slope
- Well Drained, Moderately Well Drained
-
i
Key Characteristics
- South of Big Black River
- Loess over Marine Sediments
- Southern Rolling Plains
- No Fragipan
- Loess 2 - 4 feet thick
- Summit
- Less than 8% Slope
- Well drained
- South of Big Black River
- Loess over Marine Sediments
- Southern Rolling Plains
- No Fragipan
- Loess 2 - 4 feet thick
- Backslope
- Greater than 8% Slope
- Well drained
-
i
Key Characteristics
- South of Big Black River
- Loess
- 74a Southern Bluff Hills
- Loess greater than 4 feet thick
- Summits
- Less than 12% Slope
- Well Drained
-
i
Key Characteristics
- South of Big Black River
- Loess
- 74a Southern Bluff Hills
- Loess greater than 4 feet thick
- Backslope
- Greater than 12% Slope
- Well Drained
-
i
Key Characteristics
- Southern Main Belt - 74d - Baton Rouge Terrace
- Loess
- No Fragipan
- Stream Bottom (Natural Levee)
- Loess - 34j
- Stream Bottom
-
i
Key Characteristics
- Southern Main Belt - 74d - Baton Rouge Terrace
- Loess
- No Fragipan
- Stream Terrace
- Southern Main Belt - 74d - Baton Rouge Terrace
- Loess
- No Fragipan
- Ridge in Alluvial Swamp
-
i
Key Characteristics
- Southern Main Belt - 74d - Baton Rouge Terrace
- Loess
- No Fragipan
- 1st Terrace
- Poorly Drained
- Southern Main Belt - 74d - Baton Rouge Terrace
- Loess
- No Fragipan
- Lower Landscape
- Poorly Drained
- High Sodium
-
i
Key Characteristics
- Southern Main Belt - 74d - Baton Rouge Terrace
- Loess
- Fragipan
- 2nd Terrace
- Somewhat Poorly Drained
- Southern Main Belt - 74d - Baton Rouge Terrace
- Loess
- No Fragipan
- 2nd Terrace
- Moderately Well Drained
- Southern Main Belt - 74d - Baton Rouge Terrace
- Loess
- No Fragipan
- 2nd Terrace
- Somewhat Poorly Drained
- High Sodium
- Southern Main Belt - 74d - Baton Rouge Terrace
- Loess
- Fragipan
- 1st Terrace
- Somewhat Poorly Drained
- Southern Main Belt - 74d - Baton Rouge Terrace
- Loess
- No Fragipan
- 1st Terrace
- Somewhat Poorly Drained
- Southern Main Belt - 74d - Baton Rouge Terrace
- Loess
- No Fragipan
- Lower Landscape
- Somewhat Poorly Drained
-
i
Key Characteristics
- Loess-capped terraces (Pleistocene Valley Trains)
- No restrictive horizons; well drained
-
i
Key Characteristics
- Loess-capped terraces (Pleistocene Valley Trains)
- Restrictive horizons present or poorly drained soils with a glossic horizon
- Poorly drained fragipan/glossic horizon
-
i
Key Characteristics
- Loess-capped terraces (Pleistocene Valley Trains)
- Restrictive horizons present or poorly drained soils with a glossic horizon
- Natric horizon
-
i
Key Characteristics
- Floodplains
- Well to moderately well drained
-
i
Key Characteristics
- Floodplains
- Somewhat poorly drained
-
i
Key Characteristics
- Loess-capped terraces (Pleistocene Valley Trains)
- Restrictive horizons present or poorly drained soils with a glossic horizon
- Moderately well drained fragipan
-
i
Key Characteristics
- Crowley’s Ridge uplands
- Loess greater than 4 feet thick
- Fragipan
-
i
Key Characteristics
- Crowley’s Ridge uplands
- Loess-fluviomarine sediment complex
- Backslopes greater than 12 percent slopes
-
i
Key Characteristics
- Loess-capped terraces (Pleistocene Valley Trains)
- Restrictive horizons present or poorly drained soils with a glossic horizon
- Somewhat poorly drained fragipan
-
i
Key Characteristics
- Crowley’s Ridge uplands
- Loess-fluviomarine sediment complex
- Summits less than 12 percent slopes
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ProvisionalF134XY301LA/F134XY301LAWest Central Flooded Swales And Depressions And Flood Plains - PROVISIONALiKey Characteristics
- Loess
- Loess 2 - 4 feet thick
- Broad Flats, Drains & Depressions
- Poorly Drained
- Long Flood Duration
-
i
Key Characteristics
- Loess
- Loess 2 - 4 feet thick
- Broad Flats, Drains & Depressions
- Poorly Drained
- Brief Flood Duration
-
i
Key Characteristics
- Loess
- Loess 2 - 4 feet thick
- Terrace
- Somewhat Poorly Drained
- Natric
- Loess
- Loess 2 - 4 feet thick
- Flats
- Poorly Drained
- Natric
-
i
Key Characteristics
- Loamy Alluvial - Minimal Loess
- Loess less than 1 foot thick
- Ridge on Terraces
- Somewhat Poorly Drained
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ProvisionalF134XY305LA/F134XY305LAWest Central Somewhat Poorly Drained Loess Terrace - PROVISIONAL
-
i
Key Characteristics
- Loamy Alluvial - Minimal Loess
- Loess less than 1 foot thick
- Ridge on Terraces
- Well Drained
- Loamy
-
i
Key Characteristics
- Loess
- Loess greater than 4 feet thick
- Summits
- Slopes 1 - 5 % (RV)
- Well Drained - Moderately Well Drained
-
ProvisionalF134XY308LA/F134XY308LAWest Central Scarp And Steep Loess Ridge - 5% & Greater Slope - PROVISIONALi
Key Characteristics
- Loess
- Loess greater than 4 feet thick
- Scarps & Covex ridges
- Slopes 1 - 20 % (RV)
- Well Drained - Moderately Well Drained
-
i
Key Characteristics
- Loess - 34j
- 1st Terrace
- Loess - 34j
- Lower Landscape
-
i
Key Characteristics
- Loess - 34j
- Summit
- Loess - 34j
- Sideslope Summit
- Loess - 34j
- 2nd Terrace
-
i
Key Characteristics
- Pre-Peorian age Loess - 35f
- Terrace
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Ecological site keys
MLRA 134 Main Belt (east of Mississippi River)
I.
North of Big Black River
A.
Parent material loess
1
Loess Hills physiographic subsection
i.
Backslopes (greater than 12 percent slopes)
... F134XY001TN – Northern Deep Loess Backslope Mesophytic Forest
2
Loess Plains physiographic subsection
i.
No restrictive layers or episaturation
a.
Slopes less than 8 percent
ii.
Restrictive layers (fragipan) or episaturation
a.
Interfluves/divides (uplands)
2
Drainage poor (SWPD/PD)
b.
Terraces
1
Moderately well drained (fragipan)
... F134XY013AL – Northern Loess Fragipan Terrace - PROVISIONAL
2
Drainage poor (SWPD/PD)
ii.
Poorly drained
b.
No ponding
B.
Parent material alluvium
1
Soils non-acid reaction class (typically associated with floodplains in deep loess landscapes – e.g., Loess Hills)
ii.
Drainage poor (SWPD/PD)
a.
Somewhat poorly drained
... F134XY015AL – Northern Non-Acid Moderately Wet Floodplain - PROVISIONAL
2
Soils acid reaction class
i.
Soil drainage well to excessive (natural levees)
ii.
Soil drainage poor (level to depressional floodplains)
b.
Poorly drained
II.
South of Big Black River
A.
Loess
1
74a Southern Bluff Hills
i.
Loess greater than 4 feet thick
a.
Summits
1
Less than 12% Slope
b.
Backslope
1
Greater than 12% Slope
2
74c Southern Rolling Plains
i.
No Fragipan
a.
Loess greater than 4 feet thick
1
Terrace
i.
Less than 8% Slope
a.
Poorly Drained
1
No Ponding
ii.
Fragipan
a.
Loess greater than 4 feet thick
1
Interfluve
i.
Less than 8% Slope
a.
Somewhat Poorly Drained
... F134XY103MS – Southern Rolling Plains Loess Wet Terrace - PROVISIONAL
b.
Moderately Well Drained
... F134XY105MS – Southern Rolling Plains Loess Fragipan Upland - PROVISIONAL
2
Sideslope
i.
Greater than 8% Slope
a.
Moderately Well Drained
... F134XY105MS – Southern Rolling Plains Loess Fragipan Upland - PROVISIONAL
3
Terrace
i.
Less than 8% Slope
a.
Moderately Well Drained
... F134XY105MS – Southern Rolling Plains Loess Fragipan Upland - PROVISIONAL
B.
Loess over Marine Sediments
1
Southern Rolling Plains
i.
No Fragipan
a.
Loess 2 - 4 feet thick
1
Summit
i.
Less than 8% Slope
2
Backslope
ii.
Greater than 8% Slope
ii.
Fragipan
a.
Loess 2 - 4 feet thick
1
Summit
i.
Less than 8% Slope
a.
Well Drained, Moderately Well Drained
... F134XY105MS – Southern Rolling Plains Loess Fragipan Upland - PROVISIONAL
2
Terrace
i.
Greater than 8% Slope
a.
Moderately Well Drained, Somewhat Poorly Drained
... F134XY103MS – Southern Rolling Plains Loess Wet Terrace - PROVISIONAL
C.
Alluvium
1
Non-Acid
i.
Drainageways
a.
Well Drained, Moderately Well Drained
... F134XY102MS – Southern Rolling Plains Loess Stream Terrace - PROVISIONAL
2
Acid
i.
Natural Levee
a.
Excessively Drained, Well Drained, Moderately Well Drained
ii.
Drainageways
a.
Well Drained, Moderately Well Drained
b.
Somewhat Poorly Drained
c.
Poorly Drained
1
Entic/Inceptic soil Orders
III.
Southern Main Belt - 74d - Baton Rouge Terrace
A.
Loess
1
Fragipan
i.
2nd Terrace
a.
Somewhat Poorly Drained
... F134XY124LA – Baton Rouge Terrace Southern Loess Terrace - PROVISIONAL
2
No Fragipan
i.
2nd Terrace
a.
Moderately Well Drained
... F134XY124LA – Baton Rouge Terrace Southern Loess Terrace - PROVISIONAL
b.
Somewhat Poorly Drained
3
Fragipan
i.
1st Terrace
a.
Somewhat Poorly Drained
... F134XY124LA – Baton Rouge Terrace Southern Loess Terrace - PROVISIONAL
4
No Fragipan
i.
1st Terrace
a.
Somewhat Poorly Drained
... F134XY124LA – Baton Rouge Terrace Southern Loess Terrace - PROVISIONAL
ii.
Lower Landscape
a.
Somewhat Poorly Drained
... F134XY124LA – Baton Rouge Terrace Southern Loess Terrace - PROVISIONAL
b.
Poorly Drained
iii.
Stream Terrace
... F134XY122LA – Baton Rouge Terrace Southern Loess Stream Terrace - PROVISIONAL
iv.
Ridge in Alluvial Swamp
... F134XY122LA – Baton Rouge Terrace Southern Loess Stream Terrace - PROVISIONAL
v.
Stream Bottom (Natural Levee)
... F134XY121LA – Baton Rouge Terrace Southern Loess Drainageway - PROVISIONAL
MLRA 134 Northwest - Crowleys Ridge (west of Mississippi River)
I.
Crowley’s Ridge uplands
A.
Loess greater than 4 feet thick
2
No fragipan
i.
Backslopes greater than 12 percent slopes
... F134XY001TN – Northern Deep Loess Backslope Mesophytic Forest
B.
Loess-fluviomarine sediment complex
1
Backslopes greater than 12 percent slopes
... F134XY208AL – Western Dry Loess Backslope - PROVISIONAL
II.
Loess-capped terraces (Pleistocene Valley Trains)
B.
Restrictive horizons present or poorly drained soils with a glossic horizon
III.
Floodplains
MLRA 134 Central-west - Macon Ridge (west of Mississippi River)
I.
Loamy Alluvial - Minimal Loess
A.
Loess less than 1 foot thick
1
Ridge on Terraces
i.
Well Drained
ii.
Somewhat Poorly Drained
... F134XY304LA – West Central Somewhat Poorly Drained Flats - PROVISIONAL
II.
Loess
A.
Loess greater than 4 feet thick
1
Scarps & Covex ridges
i.
Slopes 1 - 20 % (RV)
a.
Well Drained - Moderately Well Drained
... F134XY308LA – West Central Scarp And Steep Loess Ridge - 5% & Greater Slope - PROVISIONAL
2
Summits
ii.
Slopes 1 - 5 % (RV)
B.
Loess 2 - 4 feet thick
1
Terrace
i.
Somewhat Poorly Drained
2
Flats
i.
Poorly Drained
3
Broad Flats, Drains & Depressions
i.
Poorly Drained
b.
Long Flood Duration
... F134XY301LA – West Central Flooded Swales And Depressions And Flood Plains - PROVISIONAL
MLRA 134 Southwest - Lafayette Loess (west of Mississippi River)
I.
Loess - 34j
II.
Pre-Peorian age Loess - 35f
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