Terroir

Soils Descriptions

 
 

 
 

Symbols linked to descriptions.
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ChD Chamise shaly loam, 15% to 45% slopes
CkF Chamise clay loam, 30% to 45% slopes
EmA Elder loam, 0% to 2% slopes, pH 5.6-7.3
EmC Elder loam, 2% to 9% slopes, pH 5.6-7.3
EnD2 Elder shaly loam, 9% to 15% slopes, eroded, pH 5.6-7.3
LoE Los Osos clay loam, 15% to 30% slopes, pH 5.6-6.5
LoG Los Osos clay loam, 15% to 30% slopes, pH 5.6-6.5
Mt Mocho sandy loam, 0% to 2% slopes, sandy substratum, overflow, pH 7.9-8.4
Mv Mocho loam, 0% to 2% slopes, pH 7.9-8.4
PrA Pleasanton very fine sandy loam, 0% to 2% slopes, pH 7.9-8.4
PrC Pleasanton very fine sandy loam, 2% to 9% slopes, pH 7.8-8.4
Sh Sandy alluvial land,
SrF Shedd silty clay loam, 15% to 30% slopes
StA Sorrento sandy loam, 0% to 2% slopes, pH 6.6-8.4
SvA Sorrento loam, 0% to 2% slopes, pH 6.6-8.4

Chamise Series

The Chamise series consists of well-drained soils that developed over gravelly beds of silt and clay and sandy water-deposited materials. These soils have a sandy loam, loam, clay loam, or shaly loam surface layer and a shaly clay subsoil. Chamise soils normally contain a large number of water rounded fragments of Monterey Shale. These soils are on dissected high terraces in widely scattered areas. Slopes are 2% to 72%. Elevations range from 200 to 1,500 feet. The average annual rainfall is 12 to 20 inches and the average annual air temperature is about 58° F.

In a representative profile, the surface layer is dark-gray and gray shaly loam about 18 inches thick. The upper part of the subsoil is light brownish-gray shaly clay and the very shaly heavy clay loam about 19 inches thick. The lower part of the subsoil is a pale-brown very shaly clay loam to a depth of 60 inches or more.

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Shedd Series

The Shedd series consists of well drained silty clay loams underlain by calcareous shale bedrock at a depth of 18 to 50 inches. Slopes are 15% to 75%. Elevations range from 200 to 2,500 feet. The average annual rainfall is 14 to 16 inches, the average annual air temperature is about 60° F., and the frost-free season is 180 to 290 days.

In a representative profile, light brownish-gray, pale-brown, and light gray silty clay loam overlies soft, partly consolidated, fragmented shale at a depth of about 43 inches. The soils are calcareous throughout.

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Elder Series

The Elder series consists of well-drained sandy loams that developed in alluvium derived from acid shale and sandstone. These soils occur on flood plains and on alluvial fans. The vegetation is annual grasses, forbs, and oak trees. Slopes are 0% to 15%. In some areas this soil is subject to overflow from higher areas. It generally is necessary to control the overflow in order to cultivate these areas. Elevations range from 100 to 1,500 feet. The average annual rainfall is 12 to 18 inches, the average annual air temperature is about 58° F., and the frost-free season is 240 to 300 days.

In a representative profile, the surface layer is dark-gray sandy loam about 23 inches thick. The underlying layers are gray and light brownish-gray stratified sandy loam and fine sandy loam to depths of 60 inches and more. In some areas the soil is loam or shaly loam throughout the profile.

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Los Osos Series

The Los Osos series consists of well-drained clay loams that are underlain by fine-grained sandstone and shale at a depth of 20 to 40 inches. These soils have slopes of 15% to 75%. They occur in widely scattered areas on hills and mountains in the western part of the survey area. The largest acreage is in the Santa Ynez mountains south and east of Lompoc. The vegetation is annual grasses and forbs, as well as a few sagebrush plants and oak trees. Elevations range from 500 to 2000 feet. The average annual rainfall is 15 to 25 inches, the average annual air temperature is 59° F., and the frost-free season is about 240 to 320 days. Los Osos soils are associated with San Benito and Lodo soils.

In a representative profile, the surface layer is mostly dark grayish-brown clay loam about 12 inches thick. The subsoil is dark grayish-brown clay, yellowish-brown clay, and yellowish-brown very stony clay loam. This layer extends to a depth of about 25 inches, where it is underlain by highly fractured shale

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Mocho Series

The Mocho series consists of well-drained silty clay loams developed from recently deposited alluvium. These soils occur on alluvial fans and on flood plains in the Santa Maria Valley. Slopes are 0% to 2%. Vegetation is annual grasses and forbs. Elevations range from 40 to 1,800 feet. The average annual rainfall is 12 to 20 inches, the average annual air temperature is about 59° F., and the frost-free season is about 190 to 320 days.

In a representative profile, the surface layer is grayish-brown, calcareous silty clay loam about 26 inches thick. Below is grayish-brown and pale-olive, calcareous, stratified silty clay loam extending to a depth of 60 inches and more.

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Pleasanton Series

The Pleasanton series consists of well-drained sandy loams that have a cobbly clay loam subsoil. These soils formed in old alluvial deposits. The parent material is sandstone, quartzite, and Monterey Shale. Pleasanton soils occur fairly extensively on low terraces along both sides of the Sisquoc and Santa Maria Rivers in the northern part of the area. Elevations here range from 200 to 800 feet. These soils occur more extensively on low and high terraces in the wetter, western part of the Cuyama Valley where elevations range from 1,400 to 2,200 feet. Slopes are 0% to 30%. The vegetation is annual grasses, forbs, and scattered oak trees. The average annual rainfall is 12 to 18 inches, the average annual air temperature is about 59° F., and frost-free season is 180 to 260 days.

In a representative profile, the surface layer is brown heavy sandy loam about 32 inches thick. The subsoil is yellowish-brown cobbly clay loam and very cobbly loam about 21 inches thick. Below is reddish-brown very cobbly sandy loam to a depth of 60 inches and more. In some areas the surface layer is very fine sandy loam. Many areas are nearly free of gravel or cobbles; other areas are gravelly and cobbly in the surface layer.

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Sorrento Series

The Sorrento series consists of well-drained sandy loams to clay loams that formed in recent water-deposited sediments. These soils occur extensively on flood plains and alluvial fans in the Santa Maria Valley, and to a lesser extent in other valleys in the survey area. The soils have slopes of 0% to 9%. The vegetation is annual grasses, forbs, and scattered oak trees. Elevations range from 100 to 1,800 feet. The average annual rainfall is 12 to 20 inches, the average annual air temperature is about 60° F., and the frost-free season is 190 to 300 days.

In a representative profile, the surface layer is grayish-brown heavy loam about 37 inches thick. Below is pale-brown and light yellowish-brown stratified heavy loam and fine sandy loam. In some places the texture is sandy loam or clay loam throughout the profile. In places the soil is underlain by sand and gravel at a depth of 40 to 60 inches.

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