LOCATION NAUTI CA
Established Series
MEB/KP
06/2011
NAUTI SERIES
The Nauti series consists of moderately deep, well drained soils that formed in materials weathered from dioritic rock. Nauti soils are on side slopes interfluves on hills and mountains on islands. Slopes range from 5 to 75 percent. The mean annual precipitation is about 355 millimeters (14 inches) and the mean annual temperature is about 21 degrees C (69 degrees F).
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Typic Argixerolls
TYPICAL PEDON: Nauti loam, on side slopes of mountain interfluves, under a cover of sage, Lemonade bush, Laurel and grasses and at an elevation of 126 meters. (Colors are for dry soil unless otherwise noted).
A--0 to 2 inches, (0 to 5 cm); brown (10YR 5/3) broken face loam, dark brown (10YR 3/3) rubbed moist; 20 percent clay; moderate medium subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; few fine roots and common very fine roots; medium interstitial and coarse tubular pores; 5 percent 2 to 75 millimeter quartz-diorite fragments; neutral, pH 6.9 by pH meter 1:1 water; clear wavy boundary. (4 to 20 centimeters thick)
Bt1--2 to 7 inches, (5 to 18 cm); brown (10YR 4/3) broken face gravelly clay loam, dark brown (10YR 3/3) rubbed moist; 32 percent clay; moderate medium subangular blocky structure; moderately hard, friable, moderately sticky, moderately plastic; few fine roots and few very fine roots; medium interstitial and coarse tubular pores; 90 percent continuous prominent clay films on all faces of peds and 90 percent discontinuous prominent clay films on surfaces along root channels; 5 percent angular 75 to 250 millimeter quartz-diorite fragments and 15 percent 2 to 75 millimeter quartz-diorite fragments; neutral, pH 7.3 by pH meter 1:1 water; clear wavy boundary. (13 to 44 centimeters thick)
Bt2--7 to 14 inches, (18 to 35 cm); strong brown (7.5YR 5/6) broken face gravelly clay, strong brown (7.5YR 4/6) rubbed moist; 40 percent sand; 42 percent clay; strong coarse subangular blocky structure; very hard, firm, moderately sticky, moderately plastic; few fine roots and few medium roots and few very fine roots; fine tubular pores; 80 percent continuous prominent clay films between sand grains and 80 percent continuous prominent clay films on all faces of peds; 10 percent angular 75 to 250 millimeter quartz-diorite fragments and 20 percent 2 to 75 millimeter quartz-diorite fragments; neutral, pH 7.3 by pH meter 1:1 water; gradual wavy boundary. (17 to 53 centimeters thick)
Bt3--14 to 31 inches, (35 to 80 cm); light yellowish brown (10YR 6/4) broken face gravelly clay loam, yellowish brown (10YR 5/4) rubbed moist; 40 percent sand; 30 percent clay; weak medium subangular blocky structure; moderately hard, firm, moderately sticky, moderately plastic; fine tubular and medium interstitial pores; 30 percent discontinuous distinct clay films on rock fragments and 40 percent discontinuous distinct clay films between sand grains; 2 percent angular 75 to 250 millimeter quartz-diorite fragments and 15 percent angular 2 to 75 millimeter quartz-diorite fragments; slightly alkaline, pH 7.4 by pH meter 1:1 water; diffuse wavy boundary. (12 to 45 centimeters thick)
Cr--31 to 35 inches, (80 to 90 cm); hard, moderately cemented, quartz-diorite porphyry.
TYPE LOCATION: Santa Catalina Island, Los Angeles County, CA, in the Channel Islands Soil Survey Area 33 degrees North latitude, 19 minutes, 51 seconds and 118 degrees, 20 minutes, 40 seconds West longitude NAD83. - U.S.G.S Quad: Santa Catalina East.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 15 to 22 degrees C. (59 to 71 degrees F.) The soil moisture control section is dry in all parts from about mid-June to mid-November and is usually moist the rest of the time.
The A horizon dry color is 10YR 6/4, 5/4, 5/3, 4/3, 4/2, 7.5YR 6/4, 5YR 5/6. Moist color is 10YR 4/6, 3/3, 3/2, 2/2, 7.5YR 4/4, 4/3, 3/2, 5YR 4/6.
Textures are sandy loam, loam, gravely loam and gravely sandy loam throughout.
Clay percentage ranges from 4 to 15 percent.
Rock fragments range from 0 to 20.
The Bt1 and Bt2 horizon dry color is 10YR 3/2, 4/4, 5/3, 5/4, 5/6, 6/6, 7/6, 7.5YR 4/3, 4/6, 5YR 5/6. Moist color is 10YR 2/2, 3/2, 4/3, 4/4, 5/4, 7.5YR 3/3, 3/6, 4/2, 4/4, 4/6, 5/6, 5YR 4/6.
Textures are sandy loam, loam, gravely loam, very gravely loam and gravely sandy loam, very gravely sandy loam, sandy clay loam, gravely sandy clay loam, clay loam gravely clay loam throughout.
Clay percentage ranges from 10 to 40 percent.
Rock fragments range from 0 to 40.
The Bt3 or BC horizon dry color is 10YR 4/4, 6/4, 7.5YR 5/6, 5YR 5/6, 2.5Y 4/4, 7/6. Moist color is 10YR 4/4, 5/4, 5Y 4/2, 2.5Y 5/6, 5YR 5/6.
Textures are sandy loam, clay loam, extremely gravely clay loam, very gravely, sandy loam and very gravely sand clay loam throughout.
Clay percentage ranges from 8 to 38 percent.
Rock fragments range from 10 to 95.
COMPETING SERIES: These are the, ,
Bohna,
Chualar,
Chuloak,
Feethill,
Franciscan, ,
Pinto,
Shimmon,
Soper, and
Tajea series. Bohna soils are deeper than 40 inches and have an average of 30 inches of precipitation. Chualar and Chuloak soils are deeper than 40 inches and are formed in alluvium.. Feethill soils have less than 260 frost free days and formed in granite. Franciscan soils have less than 250 frost free days. Pinto soils are deeper than 40 inches. Shimmon soils have sandstone parent material and less than 240 frost free days. Soper soils have sandstone parent material. Tajea soils have a lithic sandstone.
Tehachapi soils are deeper than 40 inches and are formed in alluvium on terraces and fans.
GEOGRAPHIC SETTING: Nauti soils formed in quartz-diorite on complex side slopes of interfluves of hills and mountains on islands. Slopes range from 45 to 75 percent. Elevations are from sea level to 1550 feet (0 to 472 meters). The climate is characterized by warm, dry summers and cool, moist winters with potential fog common all year. The mean annual precipitation is 13 to 24 inches (330 to 660 mm), the mean annual temperature is 61 to 73 degrees F. (16 to 23 degrees C.), and the frost free season is 355 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Bosun,
Oboship,
Loadline,
Flyer,
Marpol and
Express. Bosun soils are skeletal, Oboship soils are Pachic Argixerolls. Loadline soils are shallow and tend to be on convex positions like crests of interfluves. Flyer soils are coarse loamy. Express soils are coarse-loamy and predominately on the upper third slopes of interfluves, the do not have and argillic. Marpol soils are fine and slopes less than 45 percent. All these soils are found on hills and mountains.
DRAINAGE AND PERMEABILITY: Well drained; high runoff; rapid permeability.
USE AND VEGETATION: Wildlife habitat, recreation and building site development. Vegetation is predominately Coastal Sage Scrub and Non-native Scrub, Maritime Cactus Scrub and Coastal Bluff Scrub, Island Chaparral.
DISTRIBUTION AND EXTENT: Santa Catalina Island, Los Angeles County, California. The soil is not extensive. MLRA 20.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California.
SERIES ESTABLISHED: Santa Catalina Island, Los Angeles County, California, 2008.
REMARKS: The series name is coined. Diagnostic horizons and features recognized in this pedon:
Mollic epipedon--The zone from the soil surface to a depth of about 18 centimeters
Argillic endopedon-- 5 to 80 centimeters.
National Cooperative Soil Survey
U.S.A.