LOCATION VORE IA +SDEstablished Series
TAXONOMIC CLASS: Fine-silty over sandy or sandy-skeletal, mixed, superactive, calcareous, mesic Aquic Udifluvents
TYPICAL PEDON: Vore silty clay loam on a nearly level bottom. (Colors are for moist soil unless
otherwise noted.)
Ap--0 to 7 inches; very dark gray (10YR 3/1) silty clay loam (32 percent clay), grayish brown
(10YR 5/2) dry; weak fine subangular blocky and weak fine granular structure; friable; few fine
dark concretions (iron oxides); few dark grayish brown (10YR 4/2) peds mixed from horizon below;
slight effervescence; mildly alkaline; clear smooth boundary. (6 to 9 inches thick)
C1--7 to 24 inches; stratified dark grayish brown (2.5Y 4/2) silty clay loam (34.9 percent clay); common fine distinct grayish brown (2.5Y 5/2) and few fine distinct dark gray (10YR 4/1)
and dark yellowish brown (10YR 4/4) mottles; very weak fine subangular blocky structure in some
strata; friable; few dark concretions (iron oxides); firm; silty clay loam strata with about 38.5
percent clay at 19 to 24 inches; few fine sand grains on peds; strong effervescence; mildly alkaline; abrupt smooth boundary. (9 to 21 inches thick)
2C2--24 to 60 inches; stratified grayish brown (2.5Y 5/2) fine sand; few fine distinct dark gray
(10YR 4/1) mottles; weak coarse platy structure due to stratification; loose; very friable fine
sandy loam strata at 24 to 29 inches; few fine dark concretions (iron oxides); strong effervescence; moderately alkaline.
TYPE LOCATION: Harrison County, Iowa; about 6 miles west of Missouri Valley; located about 400
feet west and 300 feet south of the center of sec. 16, T. 78 N., R. 45 W.;
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is moist in some part from November to July;
udic moisture regime.
Mean annual soil temperature: 49 to 56 degrees F
Depth to lithologic discontinuity: 15 to 30 inches
Thickness of the solum: less than 10 inches (A or Ap horizon)
Note: Below depths of 15 to 30 inches, typically about 24 inches, the soil is stratified loamy
fine sand or fine sand.
Particle-size control section (weighted average): sitly clay loam
Clay content: 28 to 35 percent
Ap or A horizon:
Hue: 10YR or 2.5Y
Value: 3
Chroma: 1 or 2
Texture: silty clay loam or silty clay
Clay content: 28 to 35 percent
Calcium carbonate equivalent: 5 to 30 percent
Reaction: mildly alkaline or moderately alkaline
Thickness: 6 to 9 inches
Note: some pedons do not have carbonates in the A horizon.
C horizon:
Hue: 10YR or 2.5Y
Value: 4 through 6
Chroma: 2 through 4
Redox Concentrations: hue:10YR, 2.5Y, or 7.5YR; value: 3 to 6; chroma: 1 to 8.
Texture: stratified silty clay loam
Clay content: less than 35 percent but strata less than 6 inches thick with 35 to 40 percent clay
are in some pedons.
Sand content: less than 15 percent
Calcium carbonate equivalent: 5 to 30 percent
Reaction: mildly alkaline or moderately alkaline
Thickness: 9 to 21 inches
2C horizon:
Hue: 10YR or 2.5Y
Value: 4 through 6
Chroma: 2 through
Redox Concentrations: hue: 10YR, 2.5Y, or 7.5YR; value: 3 to 6; chroma: 1 to 8.
Texture: stratified fine sand or loamy fine sand - Lenses less than 6 inches thick of fine sandy
loam, loam, or silt loam are in most pedons. Sand size is dominantly fine and medium.
Clay content: less than 10 percent
Calcium carbonate equivalent: 5 to 30 percent
Reaction: mildly alkaline or moderately alkaline
COMPETING SERIES: There are no other series in the same family. Other similar soils are the:
Blake soils do not have sandy textures in the lower part of the control section.
Grable soils have silt loam or very fine sandy loam upper horizons with less than 18 percent
clay.
Haynie soils have fine-silty control sections.
McPaul soils have fine-silty control sections.
Modale soils are coarser textured in the upper part of the control section and contain more clay
in the lower part.
Onawa soils contain more than 35 percent clay in the upper part of the control section.
Percival soils contain more than 35 percent clay in the upper part of the control section.
Rawles soils have fine-silty control sections.
Waubonsie soils are coarser textured in the upper part of the control section and contain more
clay in the lower part.
GEOGRAPHIC SETTING:
Parent material: calcareous alluvium
Landform: floodplains of the Missouri River
Slopes: 0 to 2 percent
Elevation: 900 to 1100 feet
Mean annual temperature: 47 to 54 degrees F
Mean annual precipitation: 26 to 32 inches
Frost-free period: 145 to 175 days.
Note: Some Vore soils may be as recent as the 1952 flood or before the large upstream dams were
completed.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the:
Carr soils are coarser textured in the upper part and are on slightly higher elevations.
Grable soils are on slightly higher elevations.
Haynie soils are on slightly higher elevations and lack sandy texures below 15 to 30 inches.
Onawa soils are on lower elevations and lack sandy textures below 15 to 30 inches.
Percival soils are on lower elevations and have a clayey surface.
DRAINAGE AND PERMEABILITY:
Drainage: Moderately well
Permeability: Moderate in the silty clay loam deposit and rapid in the underlying sandy deposit.
Surface runoff: Slow
Flooding: Rare to frequent for very brief periods during the months of November through July.
USE AND VEGETATION: Most areas are cropped to corn and soybeans, but other crops are grown. Land
leveling for irrigation is common in places. Native vegetation was mixed grasses and trees but
little influence on the soil can be observed.
DISTRIBUTION AND EXTENT: On the bottom lands of the Missouri River in western Iowa and possibly
adjoining states; LRR M Central Feed Grains and Livestock Region, MLRA 107 Iowa and Missouri Deep
Loess Hills; small extent.
MLRA OFFICE RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Harrison County, Iowa, 1971.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 10 to 40 inches.
Remarks: The colors of materials appear to be inherited from the alluvium. The underlying sand
may be water-bearing during some period of the year; however, these soils are not artificially
drained. Laboratory data for this site are available from the Iowa State University Soil Survey
Laboratory.
Taxonomic Version: Eighth edition, 1998
ADDITIONAL DATA:
Series T Value: 4
Surface K value: .32
Surface Wind Erodibility Group: 4L
Surface Wind Erodibility Index: 86