IDENTIFIERS

Current Taxon Name (Soil Name): Eapa

OSD

Series Extent

User Site ID: S2000MT017001

User Pedon ID: S2000MT017001

Vegetation Plot ID: S2000MT017001

Lab Information:

Certified Lab Pedon Description - no

Lab Source ID - SSL

Lab Pedon # - 00P1145

NCSS Pedon Lab Data NASIS Record ID - 12641

Print Date: 11/21/2024

LOCATION

Location In Web Soil Survey

AOI is roughly a square mile and pedon is marked in the center.

Location in SoilWeb

Location in Google Maps

Std. Latitude: 46.3060837

Std. Longitude: -105.9767532

Datum: WGS84

Location Description: 6 miles west of Miles City, Montana, approximately 2 miles south of interstate 94 on property owned by ARS Fort Keogh Livestock and Range Research Lab. Near what is locally known as the Radar Station abandoned by USAF.

State: Montana

County: MT017—Custer

MLRA: 58A—Northern Rolling High Plains, Northern Part

Non-MLRA Soil Survey Area: MT017—Custer County Area, Montana

7.5 Minute USGS Quad: 46105-C8—Lignite Creek, Montana

PEDON

Describers Name: Steve VanFossen, Bill Drummond, Jerry Setera

Current Taxonomic Class: Fine-loamy, mixed, frigid Aridic Argiborolls

Current Taxon Kind: series

Pedon Type: classifies to current taxon name, full description

Pedon Purpose: full pedon description

Pedon Record Orgin: Converted from PDP 3.x

Pedon #: 1

Sampled As Information:

Soil Name - Eapa

Taxonomic Class - Fine-loamy, mixed, frigid Aridic Argiborolls

Classificaton Date - 6/28/2000

Moisture Class - aridic (torric)

Dynamic Soil Properties:

Pedoderm Loose Cover Indicator - no

Hydric: no

SITE

Landscape: plains

Landform: alluvial flat

Geomorphic Component Hills: interfluve

Drainage Class: well

Surface Fragments:

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 6/28/2000 (actual site observation date)

Surface Cover Properties:

Site Obs. Cover Kind 1 - grass/herbaceous cover

Site Obs. Cover Kind 2 - rangeland, grassland

Pedoderm Loose Cover Indicator - no

Drained? - no

Bedded Soil? - no

Forest Plantation? - no

Vegetation Plot Plants
Plant Symbol	Scientific Name	National Vernacular Name	Plant Type Group	Canopy Cover %	Vegetation Stata Level
AGSM ARLO BOGR2 CAFI HECOC8 PASM STCO13	Agropyron smithii Arenaria longipedunculata Bouteloua gracilis Carex filifolia Hesperostipa comata ssp. comata Pascopyrum smithii Stethoma comata	— longstem sandwort blue grama threadleaf sedge needle and thread western wheatgrass —	— — — — — — —	— — — — — — —	— — — — — — —

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
mollic epipedon argillic horizon	0—25 8—41	—- —-

Setting and Climate
Slope	Slope Length USLE	Upslope Length	Elev.	Corr. Elev	Aspect	MAP	REAP	FFD	MAAT	MSAT	MWAT	MAST	MSST	MWST	MFFP	PE Index	Climate Station ID	Climate Station Name	Climate Station Type
%	m				degrees	mm	mm		C						mm
1	—	—	851	—		368	—	—	—	—	—	—	—	—	—	—	—	Miles City Airport	—

A—0 to 8 centimeters (0.0 to 3.1 inches); dark brown (10YR 3/3), brown (10YR 5/3), dry; loam; weak fine granular structure; soft, very friable, slightly sticky, slightly plastic; 3.0 very fine and fine roots throughout; 3.0 very fine and fine high-continuity interstitial pores; fragments; clear smooth boundary. Lab sample # 00P06575. estimated 20 percent noncarbonate clay; 3 mm crust on surface.

Bt1—8 to 25 centimeters (3.1 to 9.8 inches); dark brown (10YR 3/3), brown (10YR 5/3), dry; clay loam; moderate fine and medium prismatic parts to moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; 3.0 very fine and fine roots throughout and 3.0 medium roots between peds; 3.0 fine high-continuity tubular pores; 75 percent distinct clay films on faces of peds and in pores; fragments; gradual smooth boundary. Lab sample # 00P06576. estimated 28 percent noncarbonate clay.; continuous - phpvsfiid 199253; continuous - phpvsfiid 199253

Bt2—25 to 42 centimeters (9.8 to 16.5 inches); dark grayish brown (10YR 4/2), brown (10YR 5/3), dry; loam; moderate medium prismatic parts to moderate medium and coarse subangular blocky structure; hard when dry, firm, slightly sticky, slightly plastic; 3.0 very fine roots throughout and 3.0 medium roots between peds; 3.0 very fine and fine high-continuity tubular pores; 30 percent faint clay films on faces of peds and in pores; fragments; gradual smooth boundary. Lab sample # 00P06577. estimated 25 percent noncarbonate clay.; discontinuous - phpvsfiid 199254; discontinuous - phpvsfiid 199254

Bk1—42 to 63 centimeters (16.5 to 24.8 inches); light olive brown (2.5Y 5/3), light yellowish brown (2.5Y 6/3), dry; loam; weak coarse prismatic parts to moderate medium and coarse subangular blocky structure; hard when dry, firm, slightly sticky, slightly plastic; 3.0 very fine roots throughout; 3.0 very fine low-continuity tubular and 3.0 medium moderate-continuity tubular pores; 3 percent medium irregular carbonate masses throughout; fragments; violent effervescence, by hcl, 1n; gradual smooth boundary. Lab sample # 00P06578. estimated 25 percent carbonate and noncarbonate clay.

Bk2—63 to 93 centimeters (24.8 to 36.6 inches); light olive brown (2.5Y 5/3), light yellowish brown (2.5Y 6/3), dry; loam; weak coarse prismatic parts to weak coarse subangular blocky structure; hard when dry, friable, slightly sticky, slightly plastic; 3.0 very fine roots throughout; 3.0 very fine and fine low-continuity tubular pores; 1 percent medium irregular carbonate masses throughout; fragments; violent effervescence, by hcl, 1n; diffuse wavy boundary. Lab sample # 00P06579. estimated 20 percent carbonate and noncarbonate clay.

Bk3—93 to 145 centimeters (36.6 to 57.1 inches); light olive brown (2.5Y 5/3), light yellowish brown (2.5Y 6/4), dry; fine sandy loam; weak very coarse prismatic structure; slightly hard, firm, nonsticky, slightly plastic; 3.0 fine low-continuity tubular pores; 1 percent fine irregular carbonate masses throughout; fragments; violent effervescence, by hcl, 1n; clear smooth boundary. Lab sample # 00P06580. estimated 12 percent carbonate and noncarbonate clay.

2C—145 to 170 centimeters (57.1 to 66.9 inches); olive brown (2.5Y 4/4), light yellowish brown (2.5Y 6/4), dry; fine sandy loam; massive; slightly hard, firm, nonsticky, nonplastic; 3.0 fine and medium low-continuity tubular pores; 5 percent fine and medium irregular carbonate masses throughout and 3 percent medium irregular strongly coherent cemented carbonate nodules around rock fragments; 5 percent by volume rounded 2-39-75 millimeter mixed fragments; violent effervescence, by hcl, 1n; clear wavy boundary. Lab sample # 00P06581. estimated 8 percent carbonate and noncarbonate clay.

2Ck—170 to 193 centimeters (66.9 to 76.0 inches); light yellowish brown (2.5Y 6/3), pale yellow (2.5Y 7/3), dry; loam; massive; slightly hard, firm, slightly sticky, slightly plastic; 3.0 fine low-continuity interstitial and tubular pores; 3 percent coarse and very coarse irregular carbonate masses throughout; fragments; violent effervescence, by hcl, 1n. Lab sample # 00P06582. estimated 15 percent carbonate and noncarbonate clay.