Natural Resources
Conservation Service
Major Land Resource Area 116C
Major Land Resource Area
Accessed: 04/14/2026
Description
The St. Francois Knobs and Basins is the structural center of the Ozark Dome. Elevation ranges from about 450 feet along the rivers in the southern part of the area, to 1,772 feet on the summit of Taum Sauk Mountain, the highest point in Missouri. Prominent features of this MLRA are the Precambrian igneous knobs and hills that rise conspicuously to various elevations, interspersed with smooth-floored basins and valleys overlying dolomite and sandstone. Ecological Sites defined for this MLRA are commonly associated with igneous parent materials, either in knob or basin positions.
Key publications
Next steps
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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.
Ecological site list
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.
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Ecological sites
Major Land Resource Areas
Ecological site photos
Filters
F116CY008MO – Claypan Basin Flatwoods
F116CY009MO – Fragipan Basin Woodland
R116CY006MO – Shallow Igneous Knob Glade
F116CY003MO – Dry Igneous Upland Woodland
F116CY002MO – Igneous Upland Woodland
F116CY005MO – Dry Igneous Protected Backslope Woodland
F116CY011MO – Dry Igneous Exposed Backslope Woodland
F116CY004MO – Igneous Protected Backslope Forest
F116CY010MO – Igneous Exposed Backslope Woodland
Long term average mean annual precipitation
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- 100 – 120cm (39 – 47in)
- 120 – 140cm (47 – 55in)
Long term average frost free days
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- 130 – 150days
- 150 – 170days
- 170 – 190days
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- 0 – 200m (0 – 700ft)
- 200 – 400m (700 – 1300ft)
- 400 – 600m (1300 – 2000ft)
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- 0 – 3%
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- 10 – 15%
- 15 – 20%
- 20 – 25%
- 25 – 30%
- 30 – 35%
- 35 – 40%
- 40 – 45%
- 45 – 50%
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- Basin-floor remnant
- Divide
- Hill
- Hillslope
- Interfluve
- Knob
- Ridge
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- Diorite
- Granite
- Rhyolite
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- Loess
- Pedisediment
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- Slope alluvium
Soil surface texture
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- Silt loam
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Ecological site keys
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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