LOCATION LANTIS WYInactive Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, active, mesic Aridic Argiustolls
TYPICAL PEDON: Lantis stony sandy loam, rangeland. (Colors are for dry soil unless otherwise stated.)
A1--0 to 4 inches; grayish brown (10YR 5/2) stony sandy loam, dark brown (10YR 3/3) moist; strong very fine granular structure; soft, very friable; many very fine and fine, common medium roots class 1 stoniness in surface; 30 percent gravel; mildly alkaline (pH 7.4); gradual smooth boundary. (3 to 5 inches thick)
B2t--4 to 9 inches; brown (10YR 5/3) very gravelly sandy clay loam, dark brown (10YR 3/3) moist; moderate medium prismatic that parts to moderate medium subangular blocky structure; hard, friable; many very fine and fine, common medium roots; thin nearly continuous glossy coatings on faces of peds; 45 percent gravel, 15 percent cobbles, few stones; mildly alkaline (pH 7.4); clear wavy boundary. (4 to 10 inches thick)
B3ca--9 to 12 inches; pale brown (10YR 6/3) very gravelly sandy clay loam, brown (10YR 5/3) moist; weak medium subangular blocky structure; hard, friable; common fine, few medium roots; few patchy glossy coatings principally on vertical faces of peds; clay coatings on some coarse fragments; 40 percent gravel, 20 percent cobbles, few stones; calcareous; secondary calcium carbonate in the form of soft rounded masses and as coatings on coarse fragments; moderately alkaline (pH 8.3); gradual wavy boundary. (0 to 8 inches thick)
Cca--9 to 12 inches; very pale brown (10YR 7/3) very gravelly sandy loam, pale brown (10YR 6/3) moist; massive; slightly hard, very friable; few fine roots to depth of 22 inches; 35 percent gravel, 25 percent cobbles; few stones; calcareous; secondary calcium carbonate is disseminated in soft rounded masses, threads, and seams and as coatings on coarse fragments, quantity of calcium carbonate decreases with increase in depth; moderately alkaline (pH 8.3). (Several feet thick)
TYPE LOCATION: Platte County, Wyoming; on south side of access road to the Morrison ranch in the SW1/4 of the SE1/4 of sec. 6, T.25N., R.69W.
RANGE IN CHARACTERISTICS: Depth to continuous horizons of accumulated calcium carbonate is 7 to 15 inches. The solum is 7 to 20 inches thick. The mean annual soil temperature is about 66 degrees to 72 degrees F. The mean summer soil temperature is about 59 degrees to 66 degrees F.
The A horizon has hue of 2.5Y or 10YR, value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3. Gravel ranges from 15 to 35 percent and cobbles from 5 to 10 percent. This horizon is neutral or mildly alkaline.
The B2t horizon has hue of 2.5Y through 7.5YR, value of 5 or 6 dry, 3 or 4 moist; and chroma of 3 or 4. The fine earth material is sandy loam, sandy clay loam, loam, or clay loam, and averages 18 to 35 percent clay. Gravel ranges from 35 to 60 percent and cobbles from 10 to 25 percent. This horizon is neutral or mildly alkaline.
The C horizon has hue of 2.5Y or 10YR. It contains weak or moderate amounts of accumulated calcium carbonate that decrease with increase in depth. Calcium carbonate equivalent ranges from 6 to 14 percent. Gravel ranges from 35 to 50 percent and cobbles from 20 to 30 percent. This horizon is moderately or strongly alkaline.
COMPETING SERIES: These are the Dixmore, Irock, Majada, Mokiak, Montoso, Murdo, Nederland, Salas, and Willowman series. Dixmore and Mokiak soils are noncalcareous. Irock soils have a solum 20 to 40 inches thick. Montoso soils have cinders at depths of 12 to 32 inches. Nederland soils have hue of 5YR through 10R in the B2t horizon. Salas soils have a lithic contact at depths of 20 to 40 inches. Willowman soils have a calcic horizon.
GEOGRAPHIC SETTING: Lantis soils are on nearly level to moderately steep old high terraces, terrace margins, and escarpments. Slopes are 0 to 15 percent. The soils formed in calcareous gravelly and cobbly alluvium. Elevation is 4,200 to 5,500 feet. Mean annual precipitation is about 12 to 14 inches and occurs mainly in the winter and spring. Mean annual temperature is about 46 degrees to 51 degrees F. The mean summer temperature is about 65 degrees to 72 degrees F. Frost-free season is 120 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Larimer and Nihill soils. Larimer soils have ochric epipedons and have sandy-skeletal horizons below the argillic horizon. Nihill soils have ochric epipedons and lack an argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; moderate over rapid permeability.
USE AND VEGETATION: Used for range. Native vegetation is bluegrama, western wheatgrass, yucca, and cactus.
DISTRIBUTION AND EXTENT: Southeastern Wyoming. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES PROPOSED: Platte County Area, Wyoming; 1957.
OSED scanned by SSQA. Last revised by state on 10/75.