LOCATION PYRMONT OH

Established Series
Rev. AR-DRM
11/2021

PYRMONT SERIES

The Pyrmont series consists of very deep, somewhat poorly drained soils formed in dense, loamy till on till plains. Slope ranges from 0 to 6 percent. Mean annual precipitation is about 965 mm (38 inches), and mean annual temperature is about 12 degrees C (53 degrees F).

TAXONOMIC CLASS: Fine, mixed, active, mesic Aeric Epiaqualfs

TYPICAL PEDON: Pyrmont silt loam, on a 1 percent convex slope in a cultivated field. (Colors are for moist soil unless otherwise stated.)

Ap--0 to 18 cm (0 to 7 inches); dark grayish brown (10YR 4/2) silt loam, light brownish gray (10YR 6/2) dry; weak fine granular structure; friable; neutral; abrupt smooth boundary. [13 to 23 cm (5 to 9 inches) thick]

BE--18 to 25 cm (7 to 10 inches); brown (10YR 5/3) clay loam; moderate fine and medium subangular blocky structure; firm; thin continuous grayish brown (10YR 5/2) coatings on faces of peds; common fine faint dark yellowish brown (10YR 4/4) masses of iron accumulation and grayish brown (10YR 5/2) iron depletions; 2 percent rock fragments; neutral; clear smooth boundary. [0 to 10 cm (4 inches) thick]

Bt--25 to 36 cm (10 to 14 inches); brown (10YR 4/3) clay; moderate medium subangular and angular blocky structure; firm; medium continuous grayish brown (10YR 5/2) clay films on faces of peds; many medium faint grayish brown (10YR 5/2) iron depletions and few fine distinct yellowish brown (10YR 5/6) masses of iron accumulation; 5 percent rock fragments; neutral; clear wavy boundary [8 to 20 cm (3 to 8 inches) thick]

BC--36 to 43 cm (14 to 17 inches); brown (10YR 4/3) clay; moderate medium subangular blocky structure; firm; thin patchy very dark grayish brown (10YR 3/2) clay films on vertical faces of peds; common fine faint grayish brown (10YR 5/2) iron depletions and yellowish brown (10YR 5/4) masses of iron accumulation; 5 percent rock fragments; slightly effervescent; slightly alkaline; clear wavy boundary. [0 to 15 cm (6 inches) thick]

C--43 to 152 cm (17 to 60 inches); dark yellowish brown (10YR 4/4) loam; massive; firm; many medium distinct grayish brown (10YR 5/2) iron depletions and yellowish brown (10YR 5/4 and 5/6) masses of iron accumulation; 8 percent rock fragments; strongly effervescent; moderately alkaline.

TYPE LOCATION: Preble County, Ohio; about 7.5 miles east and 5.5 miles north of Eaton, in Twin Township; 1,850 feet north and 500 feet east of the southwest corner of sec. 1, T. 6 N., R. 3 E.

RANGE IN CHARACTERISTICS:
Thickness of the solum: 30 to 51 cm (12 to 20 inches)
Depth to carbonates: 25 to 46 cm (10 to 18 inches)
Particle-size control section: typically about 38 percent clay but ranges from 35 to 44 percent
Rock fragments: of mixed lithology
is 0 to 2 percent in the A horizon, 2 to 10 percent in the B horizon, and 2 to 12 percent in the C horizon.

Ap horizon:
Hue: 10YR or 2.5Y
Value: 4 or 5 (6 or more dry)
Chroma: 2 or 3
Texture: silt loam or loam
Rock fragment content: 0 to 2 percent
Reaction: moderately acid to neutral

A horizon, where present:
Thickness: 2.5 to 10 cm (1 to 4 inches)
Hue: 10YR
Value: 2 or 3 (3 to 5 dry)
Chroma: 1 or 2
Texture: silt loam or loam
Rock fragment content: 0 to 2 percent
Reaction: moderately acid to neutral

E horizon, where present:
Thickness: 5 to 13 cm (2 to 5 inches)
Hue: 10YR or 2.5Y
Value: 5 or 6
Chroma: 2 or 3
Texture: silt loam or loam
Rock fragment content: 0 to 2 percent
Reaction: moderately acid to neutral

Bt horizon:
Hue: 10YR or 2.5Y
Value: 3 to 5
Chroma: 3 or 4; coatings on faces of peds have chroma of 2
Texture: clay loam or clay
Rock fragment content: 2 to 10 percent
Reaction: moderately acid to neutral

BC horizon:
Hue: 10YR or 2.5Y
Value: 3 to 5
Chroma: 3 or 4; coatings on faces of peds have chroma of 2
Texture: clay, clay loam, loam, or silt loam
Rock fragment content: 2 to 10 percent
Reaction: neutral or slightly alkaline

C horizon:
Hue: 10YR
Value: 4 or 5
Chroma: 2 to 4
Texture: loam or silt loam
Calcium carbonate equivalent: 30 to 47 percent with a mean of about 37 percent
Rock fragment content: 2 to 12 percent
Reaction: slightly alkaline or moderately alkaline

Limestone substratum phase:
Depth to a lithic contact: 102 to 152 cm 40 to 60 inches)

COMPETING SERIES: These are the Crosby, Hyatts, McGary, and Smothers series. All of these series have sola thicker than 51 cm (20 inches). Crosby, Hyatts, and McGary soils are also deeper than 46 cm (18 inches) to carbonates. Smothers soils have their sola terminated by a lithic contact.

GEOGRAPHIC SETTING: The Pyrmont soils are on till plains. Slope ranges from 0 to 6 percent. The soils formed in dense loam or silt loam till with high calcium carbonate equivalent. Mean annual precipitation ranges from 838 to 1016 mm (33 to 40 inches). Mean annual air temperature ranges from 11 to 13 degrees C (51 to 55 degrees F).

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Brookston, Celina, Crosby, and Lewisburg soils. The poorly drained Brookston soils and moderately well drained Lewisburg soils are in a drainage sequence with Pyrmont soils. Brookston soils have mollic epipedons and are on nearly level areas or in depressions. Lewisburg soils typically are more sloping and are on higher or better drained topographic positions than Pyrmont soils. Celina and Crosby soils have thicker sola than Pyrmont soils. In addition, Celina soils are on higher or better drained topographic positions. Crosby soils are on similar topographic positions as Pyrmont soils.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat poorly drained. The potential for surface runoff is low to high. Saturated hydraulic conductivity is moderately high in the solum and moderately low in the underlying material. Permeability is moderate or moderately slow in the solum and is slow in the underlying material.

USE AND VEGETATION: A large part is under cultivation and general farming is practiced, including the raising of livestock. Principal crops are corn, wheat, oats, soybeans, and legume grass meadow. Some of the Pyrmont soils are in permanent pasture or woodland. Native vegetation is deciduous hardwood forest.

DISTRIBUTION AND EXTENT: Western Ohio; MLRA 111A. The series is of small extent, about 1100 acres.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: AMHERST, MASSACHUSETTS

SERIES ESTABLISHED: Preble County, Ohio, 1966.

REMARKS: Field investigations in areas previously correlated as Pyrmont series in Preble County documented the presence of soils with sola thicker than 20 inches and/or soils that are moderately well drained. Pyrmont soils in Preble County were re-correlated as Crosby-Lewisburg complex during the modernization project. A new type location for Pyrmont Series will need to be established during MLRA updating activities.

Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: from the surface to a depth of 25 cm (Ap, BE horizons).
Argillic horizon: from a depth of 25 to 36 cm (Bt horizon).

ADDITIONAL DATA: Characterization data is available for PB-40, the typical pedon, from the Soil Characterization Laboratory at The Ohio State University, Columbus, Ohio.

National Cooperative Soil Survey
U.S.A.