LOCATION CLICK TX
Established Series
Rev. HCD-CLG-WHD
10/2016
CLICK SERIES
The Click series consists of deep, well drained soils formed in residuum weathered from granite of pre-Cambrian age. These gently sloping and moderately sloping soils are on shoulders and summits of ridges and hills. Slope ranges from 1 to 8 percent. Mean annual temperature is about 18.9 degrees C (66 degrees F), and mean annual precipitation is about 762 mm (30 in).
TAXONOMIC CLASS: Loamy-skeletal, mixed, semiactive, thermic Typic Haplustalfs
TYPICAL PEDON: Click very gravelly coarse sandy loam -- in rangeland.
(Colors are for dry soil unless otherwise stated)
A--0 to 28 cm (0 to 11 in); brown (7.5YR 5/4) very gravelly coarse sandy loam, brown (7.5YR 4/4) moist; weak medium subangular blocky structure; slightly hard, very friable, nonsticky, nonplastic; many fine, common medium, and few coarse roots; many fine and few coarse tubular pores; 40 percent, 2 to 5 mm, quartz and feldspar gravel, non-flat, angular, indurated; noneffervescent; moderately acid; clear wavy boundary. Thickness is 20 to 41 cm (8 to 16 in)
Bt1--28 to 47 cm [11 to 18 in]; yellowish red (5YR 5/6) very gravelly coarse sandy loam, yellowish red (5YR 4/6) moist; weak medium subangular blocky structure; slightly hard, very friable, nonsticky, nonplastic; common fine and common medium roots; common fine and few coarse tubular pores; 5 percent clay films on vertical faces of peds with clay bridging sand grains; 45 percent, 2 to 5 mm, quartz and feldspar gravel, non-flat, angular, indurated; noneffervescent; slightly acid; clear smooth boundary.
Bt2--47 to 75 cm (18 to 29 in); red (2.5YR 5/6) very gravelly sandy clay loam, red (2.5YR 4/6) moist; weak coarse subangular blocky structure parting to weak medium subangular blocky; slightly hard, very friable, nonsticky, nonplastic; few fine and few medium roots throughout; few fine and few coarse tubular pores; 15 percent clay films on vertical faces of peds with clay bridging sand grains; 55 percent, 2 to 10 mm, quartz and feldspar gravel, non-flat, angular, indurated; noneffervescent; neutral; clear wavy boundary.
Bt3--75 to 115 cm (29 to 45 in); light red (2.5YR 6/8) very gravelly coarse sandy loam, red (2.5YR 5/8) moist; 5 percent brown (10YR 4/3) coating on prism faces; weak very coarse prismatic structure parting to weak coarse subangular blocky; hard, firm, nonsticky, nonplastic; few fine and few medium roots; few fine and few medium tubular pores; 5 percent distinct clay films on prism faces in root channels and around rock fragments; 60 percent, 2 to 10 mm, quartz and feldspar gravel, non-flat, angular, indurated; common mica flakes; noneffervescent; neutral; abrupt smooth boundary. Combined thickness of the Bt horizon is 31 to 115 cm (12 to 45 in)
BCt--115 to 135 cm (45 to 53 in); red (2.5YR 5/8) extremely gravelly loamy coarse sand, red (2.5YR 4/8) moist; moderate very fine subangular blocky structure; very hard, firm, slightly sticky, slightly plastic; few very fine roots in cracks; common fine and common very fine pores; 90 percent clay films on rock fragments; 85 percent, 2 to 75 mm, granite gravel, non-flat, angular, indurated; noneffervescent; moderately acid; very abrupt smooth boundary. Thickness is 10 to 51 cm (4 to 20 in)
R--135 to 160 cm (53 to 63 in); pink indurated and fractured granite bedrock.
TYPE LOCATION: Llano County, Texas; from the intersection of Texas Highway 16 and Ranch Road 2323 in Llano, 16.7 miles southwest on Ranch Road 2323, 0.3 mile west on county road, 2.7 miles northwest on county road, 100 feet south in rangeland.
USGS topographic quadrangle: House Mountain, Texas;
Latitude: 30 degrees, 36 minutes, 51.00 seconds N;
Longitude: 98 degrees, 53 minutes, 39.9 seconds W;
Datum: NAD83.
RANGE IN CHARACTERISTICS:
Soil moisture: Typic ustic moisture regime.
Depth to lithic contact: 100 to 150 cm (40 to 60 in)
Particle-size control section (weighted average):
Clay content: 10 to 25 percent
Rock fragments: 35 to 60 percent by volume, 2 to 75 mm; feldspar and quartz gravel
A horizon
Hue: 7.5YR or 10YR
Value: 4 to 7, 3 to 6 moist
Chroma: 3 to 4, 2 to 4 moist
Other features: In pedons where moist value and chroma are 3 or less, the epipedon is not thick enough for a mollic epipedon.
Texture: Coarse sandy loam or sandy loam, and gravelly or very gravelly phases
Sand: Coarse and very coarse sand comprises 40 to 60 percent of the sand fraction.
Rock fragments: 20 to 45 percent by volume, 2 to 15 mm gravels, angular, indurated
Reaction: Moderately acid to neutral
Bt horizon
Hue: 2.5YR to 7.5YR
Value: 4 to 6, 3 to 5 moist
Chroma: 4 to 8, dry and moist
Texture: Coarse sandy loam, sandy loam, or sandy clay loam, and gravelly or very gravelly phases
Clay content of the fine-earth fraction: 10 to 25 percent
Rock fragments: 25 to 60 percent by volume, 2 to 15 mm gravels, angular, indurated
Reaction: Moderately acid to neutral
BCt horizon
Hue: 10R to 7.5YR
Value: 4 to 6, 3 to 5 moist
Chroma: 4 to 8, dry and moist
Texture: loamy sand, sandy loam, loam, or sandy clay loam and their extremely gravelly phases
Clay content of the fine-earth fraction: 8 to 30 percent
Rock fragments: 60 to 90 percent by volume, granite and saprolite, 2 to 75 mm gravels, angular, induratedReaction: Moderately acid to slightly acid
R layer
Kind: crystalline granite bedrock that is fractured and contains 0 to 5 percent streaks and masses of clayey earth.
Cementation: strongly cemented or indurated
Vertical fractures: Greater than 10 cm (4 in) apart horizontally
COMPETING SERIES: There are no series in the same family. Similar soils are the
Castell,
Hilgrave (TX),
Lou (TX),
Rochelle (TX), and
Voca (TX) series.
Castell and
Voca soils: contain greater than 35 percent clay and less than 35 percent coarse fragments in the control section.
Hillgrave soils: have identifiable secondary carbonates within 40 to 70 cm (16 to 28 in)
Lou soils: Have 15 to 34 percent by volume coarse fragments in the control section.
GEOGRAPHIC SETTING:
Parent material: Residuum weathered from pre-Cambrian granite grus and granite bedrock
Landscape: Dissected plateaus
Landform: Backslopes, shoulders and summits of ridges and hills
Slope: 1 to 8 percent, but are mostly 1 to 5 percent
Precipitation Pattern: The majority of the yearly amount occurs during the fall and spring months. The winter and summer months are normally drier.
Mean annual precipitation: 686 to 838 mm (27 to 33 in)
Thornthwaite annual P-E index: 38 to 44
Mean annual air temperature: 18.3 to 19.4 degrees C (65 to 67 degrees F)
Frost-free days: 210 to 240 days
Elevation: 213.3 to 685.8 meters (700 to 2,250 ft)
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Bauman and
Keese series and the competing
Lou and
Voca series.
Bauman soils: have a natric horizon and occur on lower concave positions
Keese soils: have a paralithic contact with granite at a depth of 25 to 50 cm (10 to 20 in) and occur on higher backslopes, shoulders, and summits of ridges and hills.
Lou soils: are on backslopes, shoulders and summits of ridges and hills
Voca soils: are on undulating plains and footslopes of ridges and hills
DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderately rapid. Runoff is low on 1 to 5 percent slopes, and medium on 5 to 8 percent slopes.
USE AND VEGETATION: Used mainly for rangeland. Some areas are used for wildlife land and improved pastures. The potential plant community is an open savannah of post oak, blackjack oak, and live oak with mid and tall grasses in thin stands. The dominant grass is little bluestem. Other grasses include sideoats grama, yellow Indiangrass, sandhill lovegrass, Arizona cottontop, fringeleaf paspalum, pinhole bluestem, vine mesquite and purpletop tridens. The dominant forbs include orange zexmenia, sagewort, snoutbean, and heath aster. The woody plants include post oak, blackjack oak and live oak. Continued heavy use causes further deterioration and plants such as mesquite, whitebrush, yucca, Ashe juniper, gummy lovegrass, Texas grama, prairie coneflower, and basin sneezeweed, invade or increase on the ecological site.
DISTRIBUTION AND EXTENT: Central Texas. Southwest Plateaus and Plains Range and Cotton Region, LRR-I, MLRA 82A-Texas Central Basin. This series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Gillespie County, Texas; 1970.
REMARKS:
The Click series was described with paralithic contact between 100 and 150 cm (40 to 60 in). The series concept was changed based on a more accurate description of the typical pedon.
Edited 10/2016 (RFG-THW): Updated competing series, geographic setting, and associated soils sections.
Diagnostic horizons or features recognized in this pedon are:
Ochric epipedon: 0 to 28 cm (0 to 11 in) (A horizon)
Argillic horizon: 28 to 115 cm (11 to 45 in) (Bt horizons)
Lithic contact: The contact with granite at 135 cm (53 in) (top of R layer)
ADDITIONAL DATA: Lab data available from the National Soil Survey Laboratory on pedon 82TX299002 (samples 82P04356-82P04362) and from the type location on pedon 87TX299004 (samples 87P02429-87P02433) from Llano County, TX.
Goss, Don W.; 1964. A Study of the Mineral Transformation and Weathering Processes Occurring During the Genesis of Two Soils Developed in Llano County, Texas. MS Thesis, Texas Tech University, Lubbock, Texas.
Taxonomic Version: Keys to Soil Taxonomy, 12th Edition, 2014.
National Cooperative Soil Survey
U.S.A.