LOCATION THOMASTON               GA

Tentative Series
SDT/CM; DTA
04/2026

THOMASTON SERIES

MLRA(s): 136 (thermic part)
Soil Survey Regional Office (SSRO) Responsible: Southeast
Depth Class: Moderately deep
Agricultural Drainage Class: Well drained
Index Surface Runoff: Medium
Saturated Hydraulic Conductivity Class: High
Landscape: Piedmont uplands
Landform: Interstream divides, ridges, and side slopes
Parent Material: Loamy residuum weathered from meta-quartzite and schist
Slope: 2 to 60 percent
Elevation: 280 meters (920 feet)
Mean Annual Air Temperature (type location): 17 degrees C (63 degrees F)
Mean Annual Precipitation (type location): 1270 millimeters (50 inches)

TAXONOMIC CLASS: Fine-loamy, siliceous, semiactive, thermic Typic Hapludults

TYPICAL PEDON: Thomaston-Meansville complex, 15 to 45 percent slopes, stony; in woods. (Colors are for moist soil unless otherwise indicated.)

A--0 to 10 centimeters (0 to 4 inches); brown (10YR 4/3); channery sandy loam; weak fine granular structure; very friable; many fine and medium roots; 30 percent, by volume, of sandstone channers; strongly acid; abrupt wavy boundary.

EB--10 to 25 centimeters (4 to 10 inches) yellowish brown (10YR 5/6); channery sandy loam; weak fine granular structure; friable; common fine and few medium roots; 15 percent by volume of sandstone channers; moderately acid; clear wavy boundary.

Bt--25 to 91 centimeters (10 to 35 inches); yellowish red (5YR 4/6); sandy clay loam; moderate medium subangular blocky structure; friable; distinct discontinuous clay films on faces of some peds; 10 percent by volume of sandstone channers; strongly acid; clear wavy boundary.

Cr--91 to 203 centimeters (35 to 80 inches); soft, weathered meta-quartzite interbedded with thin strata of quartz schist; massive.

TYPE LOCATION: Lamar County, Georgia, about 0.12 mile from the intersection of Crawford Road and Water Works Road, about 95 yards east of Crawford Road past northside of road cut; USGS Barnesville, Georgia topographic quadrangle.

Latitude--33.0708
Longitude-- -84.1386
Datum--WGS84

RANGE IN CHARACTERISTICS:
Solum thickness: 102 to 152 centimeters (40 to 60 inches)
Depth to soft bedrock: 102 to 152 centimeters (40 to 60 inches)
Depth to Seasonal High Water Table: Greater than 152 centimeters (60 inches)
Rock Fragment Content: meta-quartzite and schist range from 0 to 30 percent throughout.
Soil Reaction: Strongly acid or moderately acid throughout, unless limed

RANGE OF INDIVIDUAL HORIZONS:
A horizon:
Color--hue of 10YR or 7.5YR, value of 4 or 5, chroma of 3 to 6
Texture (fine-earth fraction)--loamy sand, fine sandy loam, or sandy loam

EB horizon:
Color--hue of 5YR to 10YR, value of 4 to 6, chroma of 4 to 6
Texture (fine-earth fraction)--fine sandy loam, sandy loam, or loam

Bt horizon:
Color--hue of 2.5YR to 10YR, value of 4 or 5, chroma of 4 to 8. Mottles of brown or yellow are in the lower Bt in some pedons
Texture (fine-earth fraction)--sandy loam, loam, sandy clay loam, or clay loam

Cr horizon:
Color--Variable
Texture--weathered meta-quartzite interbedded with thin strata of quartz schist

COMPETING SERIES:
None

GEOGRAPHIC SETTING:
Landscape: Piedmont uplands
Landform: Interstream divides, ridges, and side slopes
Parent Material: Loamy residuum weathered from meta-quartzite and schist

GEOGRAPHICALLY ASSOCIATED SOILS:
Bethlehem soils--are clayey, moderately deep to soft bedrock, and lack a significant amount of fragments throughout the solum
Grover soils--are very deep to bedrock and lack a significant amount of fragments throughout the solum
Madison soils--are clayey, very deep to bedrock, and lack a significant amount of fragments throughout the solum
Meansville soils--are loamy-skeletal and shallow to soft bedrock
Pacolet soils--are clayey, very deep to bedrock, and lack a significant amount of fragments throughout the solum
Saw soils--are clayey, deep to hard bedrock, and lack a significant amount of fragments throughout the solum
Towaliga soils--are clayey, very deep to bedrock, and have a lithologic discontinuity
Tussahaw soils--are loamy-skeletal, moderately deep to soft bedrock and deep to hard bedrock

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Agricultural Drainage Class: Well drained
Index Surface Runoff: Medium
Saturated Hydraulic Conductivity: High

USE AND VEGETATION:
Major Uses: Woodland, hay and pasture
Dominant Vegetation: Where wooded--mixed hardwood and pine

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Auburn, Alabama

DISTRIBUTION AND EXTENT:
Distribution: Georgia and possibly Alabama
Extent: Small

SERIES PROPOSED: Meriwether County, Georgia: 2019. Name comes from local town.

REMARKS: These soils were previously included with the Mountainburg series and have also been mapped as cobbly and gravelly land.

Diagnostic horizons and soil characteristics recognized in this pedon:
Ochric epipedon--the zone from 0 to 10 centimeters (0 to 4 inches) (A horizon)
Argillic horizon--the zone from 25 to 91 centimeters (10 to 35 inches) (Bt horizon)
Paralithic contact--Weathered bedrock at 91 centimeters (35 inches) the upper boundary of the Cr horizon)

ADDITIONAL DATA:

________________________________________

---

National Cooperative Soil Survey
U.S.A.