LOCATION GORIN MOEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Aquertic Chromic Hapludalfs
TYPICAL PEDON: Gorin silt loam - on a 7 percent convex east-facing slope in woodland. (Colors are for moist soil unless otherwise stated.)
A--0 to 3 inches; very dark gray (10YR 3/1) silt loam, dark gray (10YR 4/1) dry; moderate very fine granular structure; friable; common fine roots; neutral; abrupt smooth boundary. (2 to 5 inches thick)
E--3 to 9 inches; dark grayish brown (10YR 4/2) silt loam; weak medium platy structure parting to moderate fine granular; friable; common fine roots; few light gray (10YR 7/1) clay depletions on faces of peds; strongly acid; clear smooth boundary. (0 to 7 inches thick)
Bt1--9 to 15 inches; dark brown (10YR 4/3) silty clay loam; moderate fine subangular and angular blocky structure; firm; few fine roots; few faint clay films on faces of peds; few fine faint yellowish brown (10YR 5/4) Fe masses in ped interiors; strongly acid; gradual smooth boundary.
Bt2--15 to 20 inches; dark brown (10YR 4/3) silty clay; moderate fine subangular blocky structure; very firm; few fine roots; many faint clay films on faces of peds; common fine prominent strong brown (7.5YR 5/6) Fe masses in ped interiors and few fine faint grayish brown (10YR 5/2) Fe depletions along channels; strongly acid; gradual smooth boundary.
Btg1--20 to 26 inches; dark grayish brown (10YR 4/2) silty clay; moderate fine subangular blocky structure; very firm; few fine roots; many faint clay films on faces of peds; many fine prominent strong brown (7.5YR 5/6) Fe masses in ped interiors; strongly acid; gradual smooth boundary.
Btg2--26 to 32 inches; grayish brown (2.5Y 5/2) silty clay; moderate fine subangular blocky structure; firm; few fine roots; many faint clay films on faces of peds; few fine prominent reddish brown (5YR 4/4) and strong brown (7.5YR 5/6) Fe masses in ped interiors; strongly acid; gradual smooth boundary.
Btg3--32 to 41 inches; grayish brown (2.5Y 5/2) silty clay loam; weak medium subangular blocky structure; firm; few fine roots; few faint clay films in old root channels; common fine prominent strong brown (7.5YR 5/6) Fe masses in ped interiors; moderately acid; clear smooth boundary. (Combined thickness of the Bt horizon is 24 to 48 inches.)
2Bt--41 to 54 inches; brown (10YR 5/3) and yellowish brown (10YR 5/6) clay loam; weak medium subangular blocky structure; firm; few fine roots; common faint clay films on faces of peds and in old root channels; moderately acid; clear smooth boundary. (8 to 20 inches thick)
3Btb--54 to 60 inches; brown (7.5YR 4/4) clay; strong fine subangular blocky structure; firm; common distinct clay films on faces of peds; common fine prominent yellowish brown (10YR 5/6), red (2.5YR 4/6), and yellowish red (5YR 5/6) Fe masses in ped interiors; 5 percent fine gravel; pebble band at top of horizon; moderately acid.
TYPE LOCATION: Scotland County, Missouri; 9 miles east of Memphis; 1,500 feet east and 250 feet north of center, sec. 9, T. 65 N., R. 10 W.
RANGE IN CHARACTERISTICS: The solum thickness ranges from 48 to 60 inches or more. Percent clay in the particle size control section averages from 35 to 50 percent. At least one subhorizon has greater than 40 percent clay.
The A or Ap horizon has color value of 3 or 4, 4 to 6 dry and chroma of 1 or 2. The E horizon has color value of 4 or 5 and chroma of 1 to 3. Texture is silt loam or silty clay loam. Reaction is very strongly acid to neutral.
The upper part of the Bt horizon has hue of 7.5YR or 10YR, value or 4 or 5 and chroma of 3 or 4. The lower part has hue of 7.5YR to 2.5Y; value of 4 or 5 and chroma of 2 to 6. There are Fe depletions with chroma of 2 or less in the upper 10 inches of the argillic horizon. It is silty clay loam or silty clay. Reaction is very strongly acid to moderately acid in the upper part and very strongly acid to neutral in the lower part.
The 2Bt horizon has hue of 10YR or 7.5YR, value of 4 or 5 and chroma of 2 to 6. It is clay loam, silt loam, loam or silty clay loam and very strongly acid to neutral. Some pedons have 2BC horizons.
The 3Bt horizon has color similar to the 2Bt horizon. It is clay or clay loam and very strongly acid to neutral.
COMPETING SERIES: These are the Colp, Galland, Jackland, Keswick, and Weller series. Colp and Weller soils have less than 10 percent sand in the lower part of the control section. Galland soils have more than 45 percent sand in the upper part of the control section. Jackland soils are thinner to the base of the control section, and contain diabase or basalt gravel. Keswick soils have more than 45 percent sand in the upper part of the control section.
GEOGRAPHIC SETTING: Gorin soils are on narrow ridgetops. Slopes range from 2 to 14 percent. The soils formed in 30 to 50 inches of loess and in the underlying loamy sediments or loess, loamy sediments and a paleosol from glacial till. The mean annual temperature ranges from 50 to 55 degrees F, and mean annual precipitation ranges from 32 to 40 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Keswick and Marion soils and the till derived Lindley soils. Lindley soils contain more sand in the upper part of the solum and have less clay. Marion soils have an abrupt textural change. Keswick and Lindley soils are on lower slopes. Marion soils are in similar positions or upslope on more broad ridgetops.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained. Runoff is medium. Permeability is slow. In undisturbed area, a perched water table has an upper limit at 1.5 to 2.5 feet during November to April during most years.
USE AND VEGETATION: Mostly used for pasture and some cultivated crops where cleared. The remainder is woodland. The native vegetation is oak-hickory forest.
DISTRIBUTION AND EXTENT: Northeast Missouri and possibly southeast Iowa. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Scotland County, Missouri, 1969.
REMARKS: Diagnostic horizons and features recognized in this series are: ochric epipedon - the zone from the surface of the soil to a depth of 9 inches (A and E horizons); argillic horizon - the zone from approximately 9 inches to 60 inches (Bt1, Bt2, Bt3, Bt4, Bt5, 2Bt6 and 2Btb horizons); aquic soil conditions at 20 inches.