LOCATION REEUP AZEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, thermic Leptic Haplogypsids
TYPICAL PEDON: Reeup loam - rangeland. (Colors are for dry soils unless otherwise noted.)
A--0 to 2 inches; brown (7.5YR 5/3) loam, brown (7.5YR 4/3) moist; weak fine granular structure; soft, very friable, slightly sticky and moderately plastic; few fine roots; few fine tubular pores; strongly effervescent; moderately alkaline (pH 8.2); abrupt smooth boundary. (1 to 4 inches thick)
Bkyc--2 to 7 inches; brown (7.5YR 5/4) gravelly clay loam, brown (7.5YR 4/4) moist; weak medium subangular blocky structure; soft, friable, moderately sticky and moderately plastic; common very fine and fine roots; few fine tubular pores; common fine and medium irregular soft masses of calcium/magnesium; common fine calcium carbonate filaments; 20 percent hard petronodes; strongly effervescent, 12 percent calcium carbonate equivalent and 6.15 percent gypsum; moderately alkaline (pH 8.4); abrupt smooth boundary. (4 to 10 inches thick)
Bky1--7 to 12 inches; light brown (7.5YR 6/4) clay, brown (7.5YR 5/4) moist; weak medium subangular blocky structure; slightly hard, firm, very sticky and very plastic; common fine roots; few fine tubular pores; common distinct organic coatings on ped faces and in pores; many iron-manganese stains on ped faces; common fine irregular soft masses of calcium/magnesium; 5 percent hard petronodes; violently effervescent, 10 percent calcium carbonate equivalent and 8.54 percent gypsum; moderately alkaline (pH 8.4); clear smooth boundary.
Bky2--12 to 21 inches; brown (7.5YR 5/4) clay, brown (7.5YR 4/4) moist; weak medium subangular blocky structure; slightly hard, firm, very sticky and very plastic; few fine roots; few fine tubular pores; common fine irregular soft masses of calcium/magnesium; 5 percent hard petronodes; strongly effervescent, 8 percent calcium carbonate equivalent and 7.64 percent gypsum; moderately alkaline (pH 8.2); clear wavy boundary.
Bky3--21 to 29 inches; light brown (7.5YR 6/4) clay loam, brown (7.5YR 5/4) moist; weak medium subangular blocky structure; slightly hard, firm, very sticky and very plastic; few fine tubular pores; few fine patchy organic coatings on ped faces and in pores; few fine iron-manganese stains on ped faces; many fine and medium irregular soft masses of calcium/magnesium; violently effervescent, 10 percent calcium carbonate equivalent and 5.65 percent gypsum; moderately alkaline (pH 8.2); clear wavy boundary. (Combined thickness of the Bky horizons is 10 to 28 inches)
Bkyc'--29 to 32 inches; brown (7.5YR 5/4) and white (7.5YR 8/1) very gravelly clay loam, brown (7.5YR 4/4) moist; weak medium subangular blocky structure; slightly hard, firm, very sticky and very plastic; few fine tubular pores; common distinct calcium carbonate and magnesium coatings on ped faces; 50 percent hard petronodes; petronodes can be easily crushed when moist but very hard when dry; violently effervescent, 4 percent gypsum; moderately alkaline (pH 8.2); abrupt wavy boundary. (3 to 8 inches thick)
2R--32 to 60 inches; interbedded sandstone, limestone and loamy soil material; extremely hard. The bedrock contains gypsum crystals; violently effervescent.
TYPE LOCATION: Fort Huachuca, Arizona; located at a latitude of 31 degrees, 36 minutes, 50 seconds North and longitude of 110 degrees, 12 minutes, 15 seconds West.
RANGE IN CHARACTERISTICS:
Soil moisture - Intermittently moist in some part of the soil moisture control section during July - September and December - February. Driest during May and June. Ustic aridic soil moisture regime.
Soil Temperature: 62 to 67 degrees F.
Petronodes: Thought to have formed from calcium and magnesium
that precipitated out during fluctuating seasonal water tables under a climate much wetter than the present. Repeated wetting and extreme drying of the soil may have been a factor in nodule development. The petronodes have no internal organization and break down completely in HCL acid but not in water.
Depth to gypsic horizon: 2 to 40 inches
Depth to interbedded bedrock: 25 to 40 inches
A horizon
Hue: 7.5YR, 10YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Effervescence: strong or violent, 0 to 10 percent calcium carbonate equivalent
Gypsum: 0 to 3 percent
Bky horizon
Hue: 7.5YR, 10YR
Value: 5 through 8 dry, 4 through 6 moist
Chroma: N, 3 or 4, dry or moist
Texture: clay loam, clay
Effervescence: strong or violent, 5 to 15 percent calcium carbonate equivalent
Gypsum: 4 to 10 percent
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Reeup soils are on stream terraces and relict basin floors. Slopes range from 3 to 45 percent. These soils formed in alluvium from mixed sources. Elevation ranges from 4,000 to 4,300 feet. The mean annual precipitation is 12 to 16 inches and occurs as thunderstorms during July to September and as gentle rains during December and January. The mean annual air temperature is 60 to 65 degrees F. The frost-free period is 180 to 240 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Kaboom, Graveyard, Gulch and Major soils. Kaboom soils are shallow. Graveyard and Gulch soils have argillic horizons. Major soils are very deep and fine-loamy.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; slow permeability.
USE AND VEGETATION: Used for military troop training, artillery impact area and wildlife habitat. Vegetation includes creosotebush, whitethorn, tarbush, four-wing saltbush, tobosa, black grama, sideoats grama and slim tridens.
DISTRIBUTION AND EXTENT: Southern Arizona. Reeup soils are of moderate extent. MLRA is 41.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Cochise County, Arizona; Soil survey of Cochise County, AZ, Douglas-Tombstone Part; 1996.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from 0 to 2 inches (A horizon)
Gypsic horizon - The zone from 2 to 32 inches (Bkyc, Bky1, Bky2, Bky3, Bkyc' horizons)
Lithic contact - The boundary at 32 inches (2R horizon)
Soil taxonomy Second Edition, 1999