LOCATION MAZARN AREstablished Series
The Mazarn series consists of moderately deep, somewhat poorly drained, moderately slowly permeable soils that formed in loamy sediments from shale, siltstone and sandstone. These soils are adjacent to small, upland drains and intermittent streams in the Ouachita Mountains; MLRA 119. Slopes range from 0 to 3 percent. Mean annual temperature is about 62 degrees F., and mean annual precipitation is about 52 inches.
TAXONOMIC CLASS: Fine-loamy, siliceous, semiactive, thermic Aquic Hapludults
TYPICAL PEDON: Mazarn silt loam, occasionally flooded, in a pasture. (Colors are for moist soil unless otherwise stated.)
A--0 to 4 inches; yellowish brown (10YR 5/4) silt loam; weak medium subangular blocky structure; friable; common fine and medium roots; many fine and medium pores; strongly acid; clear smooth boundary. (2 to 5 inches thick)
BE--4 to 14 inches; light yellowish brown (2.5Y 6/4) silt loam; common medium distinct pale brown (10YR 6/3) iron depletions; weak medium subangular blocky structure; friable; many fine and medium roots; common fine and medium pores; few fine iron-manganese concretions; very strongly acid; gradual smooth boundary. (4 to 10 inches thick)
Bt1--14 to 30 inches; brownish yellow (10YR 6/8) silt loam; many medium distinct light brownish gray (10YR 6/2) iron depletions; moderate medium subangular blocky structure; friable; common fine and medium roots; few fine and medium pores; few faint clay films on faces of peds; few fine iron-manganese concretions; strongly acid; clear smooth boundary.
Bt2--30 to 36 inches; light brownish gray (10YR 6/2) silty clay loam; common medium distinct brownish yellow (10YR 6/6) and strong brown (7.5YR 5/8) masses of iron accumulatons; moderate medium subangular blocky structure; few fine and medium pores; few faint clay films on faces of peds; few fine roots; common medium iron-manganese concretions; about 10 percent by volume shale fragments; very strongly acid; abrupt irregular boundary. (Combined thickness of the Bt horizon is 18 to 34 inches.)
2Cr--36 to 40 inches; gray, weathered, shale bedrock with dip of 20 degrees from the horizontal.
TYPE LOCATION: Garland County, Arkansas, approximately 1800 feet north and 800 feet east of the southwest corner of section 28, T. 2 S., R. 10 W.
RANGE IN CHARACTERISTICS: Solum thickness and depth to weathered, shale bedrock ranges from 20 to 40 inches. Reaction is strongly acid or very strongly acid throughout.
The A horizon has hue of 10YR, value of 3 to 5, and chroma of 2 to 4; or hue of 2.5Y, value of 5, and chroma of 2 or 4. A horizons with value of 3 are less than 6 inches thick. Texture is loam or silt loam.
The E horizon, where present, has hue of 10YR, value of 5 or 6, and chroma of 3 or 4; or hue of 2.5Y, value of 5 or 6, and chroma of 4. Texture is loam or silt loam.
The BE horizon has hue of 10YR, value of 5 or 6, and chroma of 3 or 4; or hue of 2.5Y, value of 5 or 6, and chroma of 4 or 6. Iron accumulations and depletions are in shades brown, gray or yellow. Texture is loam, silt loam or silty clay loam.
The Bt horizon has hue of 10YR, value of 5 or 6, and chroma of 3, 4, 6, or 8; or hue of 2.5Y, value of 5 or 6, and chroma of 4; and iron accumulations and depletions in shades of brown, gray or yellow; or the horizon is variagated in shades of brown, gray and yellow. Texture is loam, silt loam, silty clay loam or their gravelly or channery analogues. Coarse fragment content ranges from 0 to 30 percent by volume.
The 2BC horizon, where present, has hue of 10YR, value of 5 or 6, and chroma of 2; or hue of 2.5Y, value of 5 or 6, and chroma of 2 to 4, and iron accumulations and depletions in shades of brown, gray or yellow; or the horizon is varigated in shades of brown, gray and yellow. Texture is silty clay loam, silty clay, clay or their channery or very channery analogues. Coarse fragments range from about 10 to 50 percent by volume.
The 2Cr horizon is weathered, tilted, shale bedrock. Beds are fractured and have a dip of more than 20 degrees.
COMPETING SERIES: These are Columbus, Eunola, Mollicy, Slagle, Whitwell and Yauhannah series in the same family. Columbus soils have sola 35 to 60 inches thick and do not have a paralithic contact. Eunola and Yauhannah soils have sola 40 to 60 inches thick and do not have a paralithic contact. Mollicy soils have sola greater than 55 inches thick and do not have a paralithic contact. Slagle soils have sola 40 to 60 inches or more and do not have a paralithic contact. Whitwell soils have sola 30 to 60 inches thick and do not have a paralithic contact.
GEOGRAPHIC SETTING: Mazarn soils are on concave to level areas adjacent upland drains and small intermittent streams in the Ouachita Mountains. These areas often do not have a well defined channel or floodplain. These soils formed in loamy sediments from adjacent uplands underlain by shale, siltstone and sandstone. The mean annual temperature ranges from 59 to 63 degrees F., and the annual precipitation ranges from 50 to 56 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Avilla, Bismarck, Carnasaw, Ceda, Leadvale, Littlefir, Nashoba, Sherless, and Spadra soils. Avilla and Spadra soils, which are on terraces at higher elevations, are deep to bedrock and are well drained. Bismarck soils, which are on adjacent uplands, are shallow to shale bedrock and are well drained. Carnasaw soils, which are on adjacent uplands, have a clayey control section and are well drained. Ceda soils, which are on floodplains, have a loamy-skeletal control section and are well drained. Leadvale soils, which are on terraces, are moderately well drained and have a fragipan. Littlefir soils formed in shale, sandstone, or siltstone on adjacent uplands. Nashoba soils formed in residuum of sandstone, and are on adjacent uplands. Sherless soils formed in residuum of interbedded shale and sandstone, and are on adjacent uplands.
DRAINAGE AND PERMEABILITY: Mazarn soils are somewhat poorly drained. Permeability is moderately slow and runoff is slow. A perched, seasonally high water table is within 1 to 2 feet of the soil surface during the months of December through May most years. Some areas flood occasionally for very brief periods from December through May.
USE AND VEGETATION: Used mainly for pasture and woodland. The native vegetation was mixed hardwoods and pine.
DISTRIBUTION AND EXTENT: Ouachita Mountains of Arkansas. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: Garland County, Arkansas; 1986. The series name is the name of a nearby stream in southwest part of the county.
REMARKS: The diagnostic features recognized in this soil are:
Ochric Epipedon--Surface to a depth of 14 inches
Argillic horizon--Zone from 14 to 36 inches
Paralithic contact--Zone from 36 to 40 inches
ADDITIONAL DATA: National Soil Survey Lab data for 2 pedons. Sample numbers S84AR-051-2 and S83AR-051-2.