LOCATION MOOMER CA
Established Series
REV: BAL/JPS/ET
12/2012
MOOMER SERIES
The Moomer series consists of very deep, well drained soils formed in colluvium and residuum derived from metavolcanic rocks. The Moomer soils are moderately deep to highly fractured and weathered soft basalt. These soils are on mountains and have slopes of 15 to 30 percent. Mean annual precipitation is 1524 millimeters (60 inches) and the mean annual temperature is 12 degrees C (54 degrees F).
TAXONOMIC CLASS: Fine, mixed, active, mesic Ultic Palexeralfs
TYPICAL PEDON: Moomer gravelly clay loam - under a stand of Douglas-fir, tanoak, Pacific madrone and salal. When described on October 25, 2002 the soil was dry throughout. (Colors are for dry soil unless otherwise stated).
Oi--0 to 4 centimeters (0 to 2 inches); slightly decomposed plant material; abrupt smooth boundary. (0 to 10 centimeters thick)
A--4 to 10 centimeters (2 to 4 inches); reddish yellow (7.5YR 6/6), paragravelly clay loam, strong brown (7.5YR 4/6), moist; moderate fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine through coarse roots; many very fine through medium, and common coarse tubular pores; 25 percent paragravel; moderately acid (pH 6.0); abrupt smooth boundary. (5 to 10 centimeters thick).
Bt1--10 to 25 centimeters (4 to 10 inches); strong brown (7.5YR 5/6), paragravelly clay, strong brown (7.5YR 4/6), moist; weak medium subangular blocky structure; slightly hard, firm, very sticky and nonplastic; many fine, many medium, many coarse roots; many fine tubular, many medium tubular, common coarse tubular pores; few patchy faint clay films on all faces of peds; 15 percent medium manganese coatings in matrix; 20 percent paragravel; moderately acid (pH 5.6); clear smooth boundary.
Bt2--25 to 40 centimeters (10 to 16 inches); yellowish red (5YR 4/6), very paragravelly clay, yellowish red (5YR 4/6), moist; moderate coarse angular blocky structure; hard, firm, very sticky and very plastic; many fine, medium, and coarse roots; many medium, and common coarse tubular pores; common patchy distinct clay films on all faces of peds; 15 percent medium manganese coatings in matrix; 35 percent paragravel; strongly acid (pH 5.4); gradual smooth boundary.
Bt3--40 to 63 centimeters (16 to 25 inches); yellowish red (5YR 4/6), very paragravelly clay, yellowish red (5YR 4/6), moist; moderate coarse angular blocky structure; hard, firm, very sticky and very plastic; common medium, and coarse roots; common medium, and coarse tubular pores; common patchy distinct clay films on all faces of peds; 15 percent medium manganese coatings in matrix; 40 percent paragravel; strongly acid (pH 5.4); gradual smooth boundary.
Bt4--63 to 120 centimeters (25 to 47 inches); yellowish red (5YR 5/8), very paragravelly clay, yellowish red (5YR 5/8), moist; moderate coarse angular blocky structure; hard, firm, very sticky and very plastic; common medium, and coarse roots; common medium, and coarse tubular pores; common patchy distinct clay films on all faces of peds; 15 percent medium manganese coatings in matrix; 50 percent paragravel; strongly acid (pH 5.4); gradual wavy boundary.
Bt5--120 to 133 centimeters (47 to 52 inches); yellowish red (5YR 5/8), very paragravelly clay, yellowish red (5YR 5/8), moist; moderate coarse angular blocky structure; hard, firm, very sticky and very plastic; common medium, and coarse roots; common medium, and coarse tubular pores; few patchy distinct clay films on all faces of peds; 30 percent coarse manganese coatings in matrix; 55 percent paragravel; strongly acid (pH 5.2); clear wavy boundary. (combined thickness of Bt horizons is 100 to 150 centimeters).
CBt--133 to 180 centimeters (52 to 71 inches); 90 percent highly weathered soft basalt paragravel with 10 percent yellow (2.5Y 7/6), clay, yellow (2.5Y 7/6), moist; massive; very hard, very firm, very sticky and very plastic; common medium, and coarse roots; common medium, and coarse tubular pores; few distinct clay films on surfaces along root channels; 30 percent coarse manganese coatings in matrix; strongly acid (pH 5.2).
TYPE LOCATION: Humboldt County, California; Hoopa Tribal Nation, about 2 kilometers west of the town of Hoopa near Hospital Creek; west half of section 27, township 8 north and range 4 east; 41 degrees, 2 minutes, 34.20 seconds, north latitude; and 123 degrees, 43 minutes, 9.80 seconds, west longitude; UTM zone 10, 439536mE, 4543761mN, 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 9 to 13 degrees C (49 to 57 degrees F). The difference between the mean summer and mean winter temperature is greater than 6 degrees C. This soil has a mesic soil temperature regime.
Soil Depth: Depth to highly fractured and weathered soft basalt is 100 to 150 centimeters (40 to 60 inches).
Base saturation: Assumed by pH to be 35 to 60 percent at 180 centimeters
Surface Fragments: 0 to 5 percent gravel
Soil reaction: moderately acid to strongly acid throughout the soil profile.
Particle Size Control Section:
Clay: 35 to 50 percent.
Pararock fragments: 5 to 35 percent paragravel.
A Horizon
Hue: 10YR or 7.5YR
Value: 5 or 6 dry, 3 through 5 moist.
Chroma: 4 through 6, dry or moist.
Texture of fine earth: clay loam.
Pararock fragments: 15 to 25 percent paragravel.
Clay content: 30 to 40 percent.
Bt Horizons
Hue: 5YR or 7.5YR
Value: 4 or 5, dry or moist.
Chroma: 6 through 8, dry or moist.
Texture of fine earth fraction: clay.
Pararock fragments: 10 to 60 percent paragravel.
Clay content: 40 to 50 percent.
CBt Horizons
In lieu of texture: paragravel
Pararock fragments: 90 to 100 paragravel and paracobbles
Hue: 5YR or 7.5YR
Value: 4 or 5, dry or moist.
Chroma: 6 through 8, dry or moist.
Texture of fine earth fraction: clay.
Pararock fragments: 10 to 55 percent paragravel.
Clay content: 40 to 50 percent.
COMPETING SERIES: These are the
Bateman and
Saum series. Bateman soils have subangular rock fragments of sandstone origin throughout. Saum soils have rock fragments of basalt origin throughout. Neither the Bateman or the Saum soils have highly fractured paralithic material within 100 to 150 centimeters.
GEOGRAPHIC SETTING: These soils occur on mountains with slopes of 15 to 30 percent at elevations of 197 to 917 meters (646 to 3008 feet) on transrotational block slides. These soils formed in colluvium and residuum derived from metavolcanic rock. The climate is subhumid with warm dry summers and cool moist winters. The mean annual precipitation is 1250 to 2032 millimeters (49 to 80 inches). Mean January temperature is about 7 degrees C (44 degrees F); mean July temperature is about 20 degrees C (68 degrees F); and the mean annual temperature is 9 to 13 degrees C (49 to 57 degrees F). The growing season is about 75 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Hewent,
Tellopeak, and
Howler soils. Hewent soils are moderately deep to bedrock on linear slopes. Tellopeak soils are shallow to bedrock on convex ridge summits. Howler soils are very deep on steep toeslopes and do not have an argillic horizon.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; very high runoff; low saturated hydraulic conductivity.
USE AND VEGETATION: Used for timber production, watershed and wildlife habitat. Native vegetation is Douglas-fir, tan oak, Pacific madrone with an understory of salal, Oregon grape, poison oak, and bracken fern.
DISTRIBUTION AND EXTENT: Siskiyou-Trinity Area, MLRA 5. These soils are of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Humboldt and Del Norte Area, Humboldt County, California, 2003.
REMARKS: Diagnostic horizons and features include:
1. Ochric horizon - The zone from 0 to 10 centimeters (Oi and A horizons)
2. Argillic horizon - The zone from 10 to 133 centimeters (Bt1, Bt2, Bt3, Bt4, Bt5 & CBt horizons)
3. Particle-size control section - the zone from 10 to 60 centimeters, averages 48 percent clay, by weight, and 38 percent paragravel, by volume.
Additional Data:
Nasis User Pedon ID: 03CA023605005
Soil classified using the 11th Edition of the Keys to Soil Taxonomy.
National Cooperative Soil Survey
U.S.A.