LOCATION HASSLER MO

Established Series
Rev. RLT-LJG
12/2021

HASSLER SERIES

The Hassler series consist of deep, moderately well drained, moderately slowly permeable soils formed in loamy colluvium and residuum weathered from acid igneous rocks, primarily granite. These soils are on mountain ridgetops, lower sideslopes, and benches. Slopes range from 3 to 25 percent. Mean annual temperature is about 56 degrees F., and the mean annual precipitation is about 43 inches.

TAXONOMIC CLASS: Fine-loamy, mixed, active, mesic Oxyaquic Hapludults

TYPICAL PEDON: Hassler silt loam - on a lower shoulder and spur component of an upland ridge on an 8 percent convex slope at an elevation of 860 feet in a hardwood forest. (Colors are for moist soil unless otherwise stated.)

Oi--0 to 1.5 inches; slightly decomposed leaf litter and duff (0 to 1.5 inches thick).

A--1.5 to 3.5 inches; dark yellowish brown (10YR 3/4) silt loam; pale brown (10YR 6/3) (dry); moderate fine granular structure; friable; many fine and medium roots; 5 percent granite gravel and 3 percent granite cobbles; strongly acid (pH 5.1); abrupt wavy boundary. (2 to 3 inches thick)

E--3.5 to 6.5 inches; dark yellowish brown (10YR 4/4) silt loam; light yellowish brown (10YR 6/4) (dry); weak very fine subangular blocky structure; friable; many fine and medium roots; 3 percent granite gravel and 3 percent granite cobbles; very strongly acid (pH 4.7); clear wavy boundary. (3 to 7 inches thick)

BE--6.5 to 9.5 inches; strong brown (7.5YR 4/6) silt loam; moderate very fine subangular blocky structure; friable; common fine and medium roots; few faint clay films on faces of peds; 3 percent granite gravel and 3 percent granite cobbles; very strongly acid (pH 4.9); clear wavy boundary. (0 to 7 inches thick)

Bt1--9.5 to 17.5 inches; strong brown (7.5YR 4/6) loam; moderate very fine subangular blocky structure; firm; common fine and medium roots; few faint clay films on faces of peds; 3 percent granite gravel and 8 percent granite cobbles; very strongly acid (pH 4.8); clear wavy boundary.

Bt2--17.5 to 24.5 inches; strong brown (7.5YR 4/6) gravelly clay loam; moderate very fine and fine subangular blocky structure; firm; common fine and medium roots; few faint clay films on faces of peds; 16 percent granite gravel and 4 percent granite cobbles; very strongly acid (pH 4.7); abrupt wavy boundary. (Combined thickness of the Bt horizon is 15 to 30 inches)

2Bt3--24.5 to 31.5 inches; strong brown (7.5YR 5/6) with yellowish brown (10YR 5/8) and dark yellowish brown (10YR 4/4) gravelly loam; weak fine subangular blocky structure; firm; few fine and medium roots; few prominent clay films on faces of peds; few distinct brown (10YR 5/3) clay depletions; few fine prominent dark red (2.5YR 3/6) masses of iron accumulation; 30 percent granite gravel (highly weathered) and 2 percent granite cobbles; very strongly acid (pH 4.8); clear wavy boundary. (Combined thickness of the 2Bt horizon is 7 to 30 inches)

3BC--31.5 to 41.5 inches; brownish yellow (10YR 6/8) bouldery coarse sandy loam; weak coarse prismatic structure; firm; few fine roots; few prominent dark grayish brown (10YR 4/2) clay films along old root channels; light brownish gray (10YR 6/2) clay depletions on faces of peds; 13 percent granite gravel, 2 percent granite cobbles, and 20 percent granite boulders; very strongly acid (pH 4.6); gradual wavy boundary. (0 to 18 inches thick)

3C--41.5 to 48.5 inches; strong brown (7.5YR 5/6) and strong brown (7.5YR 4/6) bouldery coarse sandy loam; massive; firm; few fine roots near top of horizon; few prominent dark grayish brown clay films in root channels; many prominent light gray (10YR 7/2) clay depletions along bedding planes; 4 percent granite gravel and 25 percent granite boulders; very strongly acid (pH 4.7). 3R--47 inches; granite

TYPE LOCATION: Madison County, Missouri; about 8 miles northwest of Fredericktown; 1,190 feet north and 1,350 feet east of the southwest corner of section 31, T. 34 N., R. 6 E.; Rhodes Mountain USGS quadrangle; latitude 37 degrees, 36 minutes, 7.0 seconds N., longitude 90 degrees, 25 minutes, 4.0 seconds W., NAD83.

RANGE IN CHARACTERISTICS: Stones and boulders cover 0 to 3 percent of the surface area. Solum thickness: 40 to 59 inches Depth to bedrock: 40 to 60 inches (hard jointed granite with thin weathered rinds

A or Ap horizon
Hue: 10YR
Value: 3 or 4
Chroma: 3 or 4
Fine earth: silt loam
Rock fragments: 0 to 10 percent gravel, 0 to 7 percent cobbles, 0 to 3
percent stones
Reaction: slightly acid to very strongly acid

E, EB, and BE horizons:
Hue: 10YR or 7.5YR
Value: 4
Chroma: 3 to 6
Fine earth: silt loam, loam
Rock fragments: 0 to 10 percent gravel, 0 to 7 percent cobbles, 0 to 3
percent stones
Reaction: slightly acid to extremely acid

Bt horizon:
Hue: 10YR or 7.5YR
Value: 4 or 5
Chroma: 4 or 6
Fine earth: silt loam, loam, silty clay loam, clay loam
Rock fragments: 0 to 16 percent gravel, 0 to 8 percent cobbles, 0 to 3 percent stones
Reaction: slightly acid to very strongly acid

2Bt horizon:
Hue: 5YR to 10YR
Value: 4 or 5
Chroma: 2 to 8
Fine earth: loam, sandy clay loam
Rock fragments: 10 to 35 percent gravel, 0 to 20 percent cobbles, 0 to 7 percent stones
Reaction: strongly acid to extremely acid

3BC and 3C horizons:
Hue: 5YR to 10YR
Value: 4 to 6
Chroma: 4 to 8
Fine earth: loamy coarse sand, coarse sandy loam
Rock fragments: 4 to 30 percent gravel, 0 to 30 percent cobbles,
0 to 20 percent stones, 0 to 25 percent boulders
Reaction: strongly acid or extremely acid

COMPETING SERIES: These are the Chilmark, Roselle, and Tulip series. All of these soils are more than 60 inches to a lithic contact.

GEOGRAPHIC SETTING: Hassler soils are on mountain ridgetops, lower sideslopes, and benches. They formed in loamy colluvial sediments and residuum derived from acid igneous rocks, primarily granite. Slopes range from 3 to 25 percent. The mean annual temperature is 54 to 58 degrees F., and the mean annual precipitation is 38 to 46 inches.

GEOGRAPHICALLY ASSOCIATED SOILS: These include the Courtois, Delassus, Irondale, Knobtop, Syenite, Taumsauk, and Trackler series. Courtois soils have more clay and a higher base saturation. They occur where intermontane basins are underlain by dolomite and limestone. Delassus soils have a fragipan and are on broader summit positions. Irondale and Taumsauk soils are well drained, loamy-skeletal and are on similar landscape positions. Knobtop soils are moderately deep, fine-silty, and are on mountain ridgetops. Syenite soils are well drained, moderately deep to bedrock, and are on steeper side slopes. Trackler soils have iron depletions higher in their profiles and formed in fine-grained igneous rocks (rhyolite). They are on similar landscape positions.

DRAINAGE AND PERMEABILITY: Moderately well drained. Runoff is medium to high. Permeability is moderate. A perched water table is from 2.5 to 4 feet during brief periods in winter and early spring.

USE AND VEGETATION: Most areas are in forest. Other areas are cleared and used for grass and legume pasture or hay crops. Native vegetation was mixed hardwoods and pines.

DISTRIBUTION AND EXTENT: Igneous landscapes within the St. Francois Mountains of the Missouri Ozarks (MLRA 116A). The series is of small extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: INDIANAPOLIS, INDIANA

SERIES ESTABLISHED: Madison County, Missouri, 1998.

REMARKS: These soils were previously included in mapping with the Syenite series. Diagnostic horizons and features recognized in this pedon are: 1) Ochric epipedon - the zone from the surface of the soil to a depth of 9.5 inches (Oi, A, E, and BE horizons)2) Argillic horizon - the zone from 9.5 to 31.5 inches (Bt1, Bt2, 2Bt3 horizons)

ADDITIONAL DATA: University of Missouri Soil Characterization Lab number M9312307. Interpretations for the type location are stored in the NASIS data set as DMU description 123 77008 48D 093006D OSD.

National Cooperative Soil Survey
U.S.A.