LOCATION FLYAT CA

Established Series
Rev: BAL/ACF/ET
07/2016

FLYAT SERIES

The Flyat series consists of very deep, well drained soils formed in colluvium and residuum derived from mudstone. These soils are on mountains and have slopes of 9 to 50 percent. Mean annual precipitation is 1500 millimeters (59 inches) and the mean annual temperature is 12 degrees C (54 degrees F).

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Xeric Palehumults

TYPICAL PEDON: Flyat gravelly loam - under a stand of annual and perennial grasses at 616 meters (2020 feet). When described on August 23, 2005, the soil was dry throughout. (Colors are for dry soil unless otherwise stated).

A1--0 to 10 centimeters (0 to 4 inches); brown (10YR 5/3) gravelly loam, dark brown (10YR 3/3) moist; moderate very fine and fine subangular blocky parting to moderate medium granular structure; hard, firm, nonsticky and moderately nonplastic; many very fine and fine roots; many very fine tubular pores; 20 percent gravel; very strongly acid (pH 5.0); abrupt smooth boundary.

A2--10 to 35 centimeters (4 to 14 inches); brown (10YR 5/3) very gravelly loam, dark brown (10YR 3/3) moist; moderate very fine and fine subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; many very fine and fine roots; many very fine and fine tubular pores; 50 percent gravel; very strongly acid (pH 5.0); clear smooth boundary. (Combined thickness of A horizons is 25 to 45 centimeters)

Bt1--35 to 62 centimeters (14 to 24 inches); brown (10YR 5/3) gravelly silt loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky parting to strong very fine granular structure; slightly hard, very friable, moderately sticky and moderately plastic; many very fine and fine roots; many fine and medium tubular pores; few distinct clay films on all faces of peds; 20 percent gravel; very strongly acid (pH 4.7); clear smooth boundary.

Bt2--62 to 85 centimeters (24 to 33 inches); yellowish brown (10YR 5/4) gravelly silty clay loam, dark yellowish brown (10YR 4/4) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, very sticky and very plastic; many fine roots; many fine and medium tubular pores; few distinct clay films on all faces of peds; 20 percent gravel, 5 percent cobbles; very strongly acid (pH 4.7); clear smooth boundary.

Bt3--85 to 100 centimeters (33 to 40 inches); yellowish brown (10YR 5/4) gravelly silt loam, dark yellowish brown (10YR4/4) moist; weak fine and medium subangular blocky structure; slightly hard, very friable, moderately sticky and moderately plastic; many fine roots; many fine and medium tubular pores; few distinct clay films on all faces of peds; 18 percent gravel; very strongly acid (pH 5.0); clear wavy boundary. (Combined thickness of Bt horizons is 45 to 130 centimeters)

BCt--100 to 155 centimeters (40 to 61 inches); light gray (2.5Y 7/2) very gravelly clay loam, light olive brown (2.5Y 5/4) moist; massive; hard, friable, very sticky and very plastic; many fine roots; common fine tubular pores; very few faint clay films on all faces of peds; 40 percent gravel, 30 percent weakly cemented mudstone paragravel; very strongly acid (pH 5.0). (0 to 60 centimeters thick)

TYPE LOCATION: Humboldt County, California; Redwood Creek Valley; USGS Lord-Ellis Summit topographic quadrangle; WGS84 Decimal degrees 40.9732500 latitude and -123.8165556 longitude; UTM Zone 10 431299mE, 4536113mN; NAD 83.

RANGE IN CHARACTERISTICS:

Soil moisture: The soil moisture control section is dry from July 1st to October 15th and moist in all parts from November 15 to June 1st. This soil has a xeric soil moisture regime.

Soil temperature: The mean annual soil temperature is 10 to 15 degrees C (50 to 59 degrees F). The difference between mean summer and mean winter temperature is 6 to 10 degrees C. The soils have a mesic soil temperature regime.

Soil reaction: very strongly acid to moderately acid.

Base saturation (by sum of cations) is less than 35 percent at 125 centimeters below the top of the argillic horizon.

Organic carbon is 12kg or more in the upper cubic meter of the mineral soil or the upper 15 cm of the argillic has 0.9 percent or more organic carbon.

Depth to redoximorphic features: greater than 100 centimeters (40 inches).

Particle Size Control Section (weighted average):
Clay content: 20 to 35 percent.
Coarse fragments: 5 to 35 percent gravel and 0 to 5 percent cobbles.

A horizons
Hue: 10YR or 2.5Y
Value: 3 through 5 dry; 2 or 3 moist
Chroma: 3 or 4 dry; 2 or 3 moist

Texture of the fine earth fraction: loam
Clay content: 10 to 25 percent
Rock Fragments: 5 to 55 percent gravel

Upper Bt horizons
Hue: 10YR or 2.5Y
Value: 3 through 5 dry; 3 through 5 moist
Chroma: 3 or 4 dry, 2 through 4 moist

Texture of the fine earth fraction: loam, silt loam, clay loam, and silty clay loam.
Clay content: 20 to 35 percent
Rock fragments: 5 to 30 percent gravel and 0 to 5 percent cobbles

Lower Bt horizons
Hue: 10YR or 2.5Y
Value: 3 through 5 dry; 3 through 5 moist
Chroma: 3 or 4 dry, 2 through 4 moist

Texture of the fine earth fraction: clay loam, silty clay loam, and silty clay.
Clay content: 30 to 45 percent
Rock fragments: 0 to 30 percent gravel
Paragravel: 0 to 60 percent

Some pedons have C horizons

C horizons
Hue: 10YR or 2.5Y
Value: 4 through 7 dry and moist
Chroma: 2 through 4 dry and moist
Texture of the fine earth fraction: clay loam and silty clay loam.
Clay content: 30 to 40 percent
Rock fragments: 0 to 55 percent gravel
Paragravel: 0 to 80 percent

Redoximorphic features: fine and medium, extremely weakly cemented iron and manganese masses
Quantity: none to many
Hue: 7.5YR, 10YR, 2.5Y
Value: 3 through 5 moist
Chroma: 3 through 6 moist

COMPETING SERIES: These are the Buckpeak, Centralia, and Highoaks soils. The Buckpeak and Centralia soils have 7.5YR colors throughout the subsurface horizons. Highoaks soils have an ochric epipedon.

GEOGRAPHIC SETTING: These soils occur on mountains with slopes of 9 to 50 percent. They are in linear slope positions at elevations of 322 to 1206 meters (1056 to 3957 feet) in predominately south and southwest facing aspects. These soils formed in colluvium and residuum derived from mudstone. The climate is subhumid with warm, dry summers and cool, wet winters. The mean annual precipitation is 1250 to 2032 millimeters (49 to 80 inches). Mean January temperature is about 7 degrees C; mean July temperature is about 15 degrees C; and the mean annual temperature is 10 to 15 degrees C (50 to 59 degrees F). The frost free period is about 240 to 280 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Hawthorse and Rockus series. Hawthorse soils are fine with more than 35 percent clay in the particle size control section. Rockus soils are loamy-skeletal with more than 35 percent rock fragments in the particle size control section. Hawthorse soils are found in concave slope positions generally below Flyat soils. Rockus soils are found in convex slope positions generally above Flyat soils.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: well drained; high runoff; moderately slow saturated hydraulic conductivity. The water table is between 100 and 150 centimeters (40 to 60 inches) in January, February, and March.

USE AND VEGETATION: This soil is mostly used for livestock grazing, wildlife habitat, and watershed. Natural vegetation is bristly dogtail grass, blue wild rye, soft brome, and orchardgrass. Douglas-fir invades readily in the absence of fire.

DISTRIBUTION AND EXTENT: Siskiyou-Trinity Area, MLRA 5. The series is not extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Humboldt County, California, 2012. Proposed 2005.

REMARKS: Diagnostic horizons and features include:

1. Umbric horizon - The zone from 0 to 62 centimeters (A1, A2 and Bt1 horizon)
2. Argillic horizon - The zone from 35 to 155 centimeters (Bt1, Bt2, Bt3, and BCt horizons)
3. Particle size control section - The zone from 35 to 85 centimeters, averaging (by weight) 27 percent clay and 22 percent rock fragments (Bt1 and Bt2 horizons).
4. Palehumults feature - clay maximum is 29 percent in the Bt2 and the minimum is 25 percent in the Bt3.

ADDITIONAL DATA:

NASIS User Pedon ID: 05CA023605025

Soil classified using Keys to Soil Taxonomy, 12th edition.

National Cooperative Soil Survey
U.S.A.