LOCATION REEDSCREEK IAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, nonacid, mesic Mollic Udifluvents
TYPICAL PEDON: Reedscreek loam, on a slope of about 1 percent, in a wooded pasture, in a floodplain, at an elevation of 168 meters above mean sea level. (Colors are for moist soil unless otherwise stated.)
A--0 to 15 centimeters; alternating layers of very dark grayish brown (10YR 3/2), dark grayish brown (10YR 4/2), and brown (10YR 4/3) loam, grayish brown (10YR 5/2), light brownish gray (10YR 6/2), and pale brown (10YR 6/3) dry; very dark grayish brown (10YR 3/2) kneaded; weak very fine and fine granular structure; friable; few fine roots; about 2 percent pebbles; about 2 percent cobbles; about 1 percent stones; slightly alkaline; clear smooth boundary. (15 to 25 centimeters thick)
C1--15 to 31 centimeters; dark grayish brown (10YR 4/2) loam; massive; friable; few fine and medium roots; common fine distinct brown (7.5YR 4/4) redoximorphic concretions; about 5 percent pebbles; about 2 percent cobbles; about 1 percent stones; very slightly effervescent; slightly alkaline; clear wavy boundary.
C2--31 to 38 centimeters; alternating layers of dark grayish brown (10YR 4/2) and brown (10YR 4/3) extremely gravelly sandy loam; massive; friable; few fine and medium roots; about 28 percent pebbles; about 20 percent cobbles; about 15 percent stones; slightly effervescent; moderately alkaline; clear wavy boundary.
C3--38 to 61 centimeters; stratified dark grayish brown (10YR 4/2), and brown (10YR 4/3) cobbly sandy loam and cobbly loam; massive; friable; few fine and medium roots; about 1 percent pebbles; about 15 percent cobbles; about 5 percent stones; very slightly effervescent; slightly alkaline; clear wavy boundary.
C4--61 to 81 centimeters; stratified brown (10YR 4/3) very cobbly sandy loam and very cobbly loamy sand; massive; friable; few fine and medium roots; about 2 percent pebbles; about 30 percent cobbles; about 5 percent stones; very slightly effervescent; slightly alkaline; clear wavy boundary.
C5--81 to 99 centimeters; stratified brown (10YR 4/3) extremely cobbly sandy loam and extremely cobbly loamy sand; massive; very friable; about 23 percent pebbles; about 39 percent cobbles; about 1 percent stones; strongly effervescent; moderately alkaline; clear wavy boundary.
C6--99 to 119 centimeters; stratified dark grayish brown (10YR 4/2) and brown (10YR 4/3) very cobbly sandy loam and very cobbly loamy sand; massive; very friable; about 8 percent pebbles; about 40 percent cobbles; about 10 percent stones; strongly effervescent; moderately alkaline; clear wavy boundary.
C7--119 to 168 centimeters; stratified dark grayish brown (10YR 4/2) and brown (10YR 4/3) extremely gravelly sandy loam and extremely gravelly loamy sand; massive; very friable; about 37 percent pebbles; about 31 percent cobbles; about 10 percent stones; strongly effervescent; moderately alkaline; abrupt wavy boundary.
2R--168 centimeters; hard fractured limestone bedrock.
TYPE LOCATION: Major Land Resource Area (MLRA) 109-Iowa and Missouri Heavy Till Plain; Van Buren County, Iowa subset; about 2 miles southeast of Bonaparte; located about 2,470 feet west and 1,640 feet south of the northeast corner of section 15, T. 68 N., R. 8 W.; USGS Bonaparte, Iowa topographic quadrangle; lat. 40 degrees 41 minutes 32 seconds N. and long. 91 degrees 45 minutes 58 seconds W., NAD 83.
RANGE IN CHARACTERISTICS:
Ochric epipedon thickness--6 to 10 centimeters
Depth to bedrock--more than 150 centimeters
Depth to carbonates--0 to 25 centimeters
Clay content in the particle-size control section (weighted average)--2 to 18 percent
Sand content in the particle-size control section (weighted average)--5 to 80 percent
A horizon:
Hue--10YR
Value--2 to 4
Chroma--1 to 3
Texture--fine sandy loam, silt loam, loam, loamy fine sand or the gravelly and cobbly analogs of these textures
Clay content--5 to 18 percent
Sand content--5 to 65 percent
Rock fragment content--1 to 25 percent, mostly limestone and sandstone pebbles, cobbles and stones
Reaction--slightly alkaline or moderately alkaline
Most pedons have stratified colors due to sediment deposition related to flooding events
C horizon:
Hue--7.5YR or 10YR
Value--4 to 6
Chroma--2 to 6
Texture--stratified loamy sand to silt loam, or the gravelly, very gravelly, extremely gravelly, cobbly, very cobbly, or extremely cobbly analogs of these textures
Clay content--2 to 18 percent
Sand content--5 to 80 percent
Rock fragment content--35 to 60 percent--mostly limestone and sandstone pebbles, cobbles and stones, some subhorizons range from 1 to 80 percent
Reaction--slightly alkaline or moderately alkaline
Most pedons have stratified colors due to sediment deposition related to flooding events
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Parent material--stratified loamy alluvium
Landform--floodplains in river valleys
Slope--0 to 5 percent
Elevation--200 to 300 meters above mean sea level
Mean annual air temperature--9 to 12 degrees C
Mean annual precipitation--865 to 1,040 millimeters
Frost-free period--175 to 210 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Bentonsport,
Colo,
Coppock,
Nodaway, and
Nordness soils.
Bentonsport--are on higher landscape positions on very steep side slopes on high structural benches, remnants of interfluves, and uplands and are not frequently saturated within a depth of 1.9 meters
Colo--are on lower landscape positions on floodplains and have a mollic epipedon more than 90 centimeters thick
Coppock--are on lower landscape positions on stream terraces, floodplains, footslopes, or alluvial fans and are frequently saturated at the surface to within 0.3 meter of the surface
Nodaway--are on landscape positions similar to those of the Reedscreek soils and have a clay content that averages 18 to 28 percent in the particle-size control section
Nordness--are on higher landscape positions on very steep side slopes on high structural benches, remnants of interfluves, and uplands, and have fractured limestone bedrock within 50 centimeters of the surface
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--moderately well drained--a frequently saturated zone occurs within depths of 1.0 to 1.8 meters in years when precipitation is within one standard deviation of the 30 year mean of annual precipitation
Saturated hydraulic conductivity--10.0 to 100 micrometers per second
Flooding--occasionally flooded for brief duration
USE AND VEGETATION:
Most areas are in permanent pasture or woodland. Some areas are cultivated. Corn, soybeans, small grains, and legume hay are principal crops. The native vegetation is mixed deciduous trees (oak and hickory) and big bluestem, indiangrass, switchgrass, and other grasses of the tall grass prairie.
DISTRIBUTION AND EXTENT:
Physiographic Division--Interior Plains
Physiographic Province--Central Lowland
Physiographic sections--Dissected till plains
MLRA--Iowa and Missouri Heavy Till Plain (109)
LRR M; along small streams in southeastern Iowa
Extent--small
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana; MLRA SSO 10-12 (Fairfield, Iowa)
SERIES ESTABLISHED: Van Buren County, Iowa, 1995.
REMARKS:
Particle-size control section--the zone from a depth of 25 to 100 centimeters;
series control section--the zone from the soil 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 15 centimeters (A horizon);
udic moisture regime.
Reedscreek soils were previously identified as Nodaway-Coppock complex, flaggy.
Cation-exchange activity class is supported by lab data, NSSL.
Taxonomic version--Keys to Soil Taxonomy, tenth edition, 2006.
ADDITIONAL DATA:
Laboratory data--National Soil Survey Laboratory, Lincoln, Nebraska--User Pedon ID 92IA177003 (http://ssldata.sc.egov.usda.gov/).