LOCATION MYSTIC IA+MOEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Aquertic Hapludalfs
TYPICAL PEDON: Mystic silt loam, near the summit of a convex interfluve, on a slope of 5 percent, in a cultivated field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 15 centimeters; very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; weak fine granular structure; friable; some mixing of brown (10YR 4/3) less than 5 percent; common distinct light brownish gray (10YR 6/2) dry, silt and fine sand coats on faces of some peds; moderately acid; abrupt smooth boundary. (13 to 23 centimeters thick)
E--15 to 25 centimeters; brown (7.5YR 4/2) silt loam; weak coarse platy structure parting to moderate fine subangular blocky; friable; some mixing of very dark grayish brown (10YR 3/2) less than 5 percent; common distinct light brownish gray (10YR 6/2) dry, silt and fine sand coats on faces of peds; few fine distinct reddish brown (5YR 4/4) redoximorphic concentrations; very strongly acid; clear smooth boundary. (0 to 15 centimeters thick)
BE--25 to 33 centimeters; brown (7.5YR 5/4) clay loam; moderate fine subangular blocky structure; friable; brown (7.5YR 4/2) coats on faces of peds; common distinct light brownish gray (10YR 6/2) dry, silt and fine sand coats on faces of peds; few fine prominent red (2.5YR 4/6) redoximorphic concentrations; strongly acid; clear smooth boundary. (0 to 15 centimeters thick)
Bt1--33 to 43 centimeters (13 to 17 inches); dark reddish brown (2.5YR 3/4) clay loam; reddish brown (5YR 4/4) kneaded; strong fine subangular blocky structure; firm; grayish brown (10YR 5/2) coats on faces of peds; many prominent white (10YR 8/1) dry, silt and fine sand coats on faces of peds; common distinct clay films; few fine dark reddish brown (5YR 3/2) concretions (iron oxides); strongly acid; clear smooth boundary.
Bt2--43 to 58 centimeters; grayish brown (2.5Y 5/2) clay loam; brown (7.5YR 4/4) kneaded; moderate fine prismatic structure parting to moderate fine subangular blocky; firm; many distinct clay films; common fine dark reddish brown (5YR 3/2) concretions (iron oxides); many fine prominent dark reddish brown (2.5YR 3/4) redoximorphic concentrations; strongly acid; gradual smooth boundary.
Bt3--58 to 81 centimeters; brown (10YR 5/3) clay loam; weak medium prismatic structure parting to weak medium and coarse subangular blocky; grayish brown (10YR 5/2) coats on faces of peds; firm; common distinct clay films on faces of prisms and along surfaces of root channels; many fine dark reddish brown (5YR 2/2) concretions (iron and manganese oxides); few fine distinct yellowish brown (10YR 5/6) redoximorphic concentrations; moderately acid; gradual smooth boundary.
Bt4--81 to 109 centimeters; brown (10YR 5/3) clay loam; weak medium prismatic structure; firm; few distinct clay films on faces of prisms and along surfaces of root channels; fine dark reddish brown (5YR 2/2) concretions (iron and manganese oxides); few fine distinct gray (10YR 5/1) redoximorphic depletions; few fine distinct yellowish brown (10YR 5/6) redoximorphic concentrations; slightly acid; gradual smooth boundary. (Combined thickness of the Bt horizon is 55 to 100 centimeters.)
BC--109 to 137 centimeters; pale brown (10YR 6/3) sandy clay loam; weak coarse prismatic structure; friable; few distinct clay films on faces of prisms; few fine dark reddish brown (5YR 2/2) concretions (iron and manganese oxides); common fine and medium faint light brownish gray (10YR 6/2) redoximorphic depletions; few fine distinct yellowish brown (10YR 5/6) redoximorphic concentrations; slightly acid; gradual smooth boundary. (0 to 30 centimeters thick)
C--137 to 163 centimeters; pale brown (10YR 6/3) sandy loam; massive; friable; few fine dark reddish brown (5YR 2/2) concretions (iron oxides); common fine and medium faint light gray (10YR 7/2) redoximorphic depletions; few fine distinct yellowish brown (10YR 5/6) redoximorphic concentrations; slightly acid.
TYPE LOCATION: Major Land Resource Area (MLRA) 109-Iowa and Missouri Heavy Till Plain; Wayne County, Iowa subset; about 4 miles west and 3 miles north of Corydon; located about 2,035 feet south and 575 feet east of the northwest corner of section 4, T. 69 N., R. 22 W.; USGS Humeston topographic quadrangle; lat. 40 degrees 48 minutes 23 second N. and long. 93 degrees 24 minutes 5.8 seconds W., NAD 83.
RANGE IN CHARACTERISTICS:
Depth to carbonates--greater than 150 centimeters
Content of clay in the particle-size control section (weighted average)--35 to 45 percent
Content of sand in the particle-size control section (weighted average)--18 to 30 percent
A or Ap horizon:
Hue--10YR
Value--3
Chroma--1 or 2
Texture--silt loam, loam, or clay loam
Clay content--20 to 35 percent
Sand content--15 to 40 percent
Rock fragment content--0 percent
Reaction--very strongly acid to neutral
E horizon (when present):
Hue--7.5YR or 10YR
Value--4 or 5
Chroma--2 or 3
Texture--silt loam or loam
Clay content--15 to 25 percent
Sand content--10 to 40 percent
Rock fragment content--0 percent
Reaction--very strongly acid to slightly acid
In some pedons the E horizon has been incorporated into the Ap horizon
BE horizon (when present):
Hue--5YR or 7.5YR
Value--4 or 5
Chroma--3 or 4
Texture--clay loam
Clay content--30 to 35 percent
Sand content--20 to 40 percent
Rock fragment content--0 percent
Reaction--very strongly acid to slightly acid
Bt horizon:
Hue--2.5YR to 2.5Y
Value--3 to 5
Chroma--1 to 4
Texture--clay loam, clay, or silty clay
Clay content--35 to 50 percent
Sand content--5 to 35 percent
Rock fragment content--0 percent
Reaction--very strongly acid to slightly acid
Some pedons have thin, less than 15 centimeters thick, strata of coarser textures
BC and C horizons:
Hue--5YR, 7.5YR, or 10YR
Value--4 to 6
Chroma--2 to 8
Texture--sandy loam, sandy clay loam, clay loam, loam, or is stratified with these textures
Clay content--10 to 30 percent
Sand content--30 to 70 percent
Rock fragment content--2 to 15 percent
Reaction--slightly acid or neutral
Moderately coarse to fine textured sediments high in quartz are common in the lower part of the BC horizon and in the C horizon
COMPETING SERIES: These are the
Armstrong,
Clafork,
Malmo,
Otoe, and
Pering series.
Armstrong--have rock fragments in the upper third of the series control section
Clafork--have brittle horizons in the lower third of the series control section
Malmo--have carbonates within depths of 38 to 102 centimeters
Otoe--have a sand content of 1 to 10 percent in the particle-size control section and have carbonates within depths of 76 to 127 centimeters (30 to 50 inches)
Pering--have a sand content of less than 10 percent in the particle-size control section and do not have carbonates in the series control section
GEOGRAPHIC SETTING:
Parent material--loamy alluvium derived from glaciers
Landform--convex ridges and side slopes of high structural benches that border valleys of major streams and their tributaries. These areas are distinctly higher in elevation than the modern flood plains but are lower in elevation than the adjacent late Wisconsin recent dissection slopes.
Slope--5 to 18 percent
Elevation--198 to 366 meters above sea level
Mean annual air temperature--10 to 12 degrees C
Mean annual precipitation--810 to 920 millimeters
Frost-free period--165 to 180 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Caleb,
Gara,
Lindley, and
Shelby soils.
Caleb--are at lower landscape positions on side slopes and have a clay content that averages 18 to 35 percent in the particle-size control section
Gara--are at slightly higher landscape positions on side slopes and have a clay content that averages 30 to 35 percent in the particle-size control section
Lindley--are at higher landscape positions on side slopes and have a clay content that averages 18 to 35 percent in the particle-size control section
Shelby--are at higher landscape positions on side slopes and have a clay content that averages 30 to 35 percent in the particle-size control section
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat poorly drained--a frequently saturated zone occurs within a depth of 0.3 meter during the wettest periods of normal years
Saturated hydraulic conductivity--0.42 to 1.41 micrometers per second (moderately low)
Surface runoff potential--high
USE AND VEGETATION:
Most areas are used for hay and pasture but some areas are used for cultivated crops. Native vegetation is mixed big bluestem, little bluestem, switchgrass, other grasses of the tall grass prairie, and deciduous trees.
DISTRIBUTION AND EXTENT:
Physiographic Division--Interior Plains
Physiographic Province--Central Lowland
Physiographic section--Dissected till plains
MLRAs--Illinois and Iowa Deep Loess and Drift (108), Iowa and Missouri Heavy Till Plain (109), Central Clay Pan Areas (113), Central Mississippi Valley Wooded Slopes (115)
LRR M; southern Iowa and northern Missouri
Extent--moderate
MLRA OFFICE RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Appanoose County, Iowa, 1970.
REMARKS:
Particle-size control section--the zone from a depth of 33 to 83 centimeters;
series control section--the zone from the surface to a depth of 150 centimeters.
Diagnostic horizons and features recognized in this pedon include:
ochric epipedon--the zone from the surface to a depth of 33 centimeters (Ap, E, and BE horizons);
argillic horizon--the zone from a depth of 33 to 109 centimeters (Bt1, Bt2, Bt3, and Bt4 horizons;)
udic moisture regime.
Taxonomy version--Keys to Soil Taxonomy, tenth edition, 2006.