The Lake County Winegrape Commission has generated articles describing various soils found in Lake County, California.

Aiken - (Click for full article)
Aiken soils are very deep soils formed in material weathered from basalt under conifer and hardwood forests. They are mature, somewhat permeable soils of limited fertility on gently to strongly sloping hillsides.

Forbesville - (Click for full article)
Forbesville soils are very deep soils formed from alluvial sediments under blue oak, brush and grasses. They are mature, somewhat slowly permeable soils of moderate native fertility found on sloping terraces.

Haploxeralfs - (Click for full article)
Haploxeralfs are moderately deep to very deep, well to somewhat excessively drained soils formed in mixed parent materials under brush lands. They are of limited fertility, found on steep, dissected hills.

Jafa - (Click for full article)
Jafa soils are very deep soils formed from alluvial sediments under a mixed conifer-hardwood forest. They are mature, somewhat slowly permeable soils of moderate native fertility found on sloping terraces.

Manzanita - (Click for full article)
Manzanita soils are very deep soils formed in alluvial sediments under oak, brush and grass. They are mature, somewhat slowly permeable soils of limited fertility found on gently to strongly sloping terraces.

Still - (Click for full article)
Still soils are very deep soils formed in alluvium from mixed sources, including obsidian, under grass, forb and oak woodland cover. They are permeable soils of varied fertility on gently sloping alluvial plains.

Talmage - (Click for full article)
Talmage soils are very deep, somewhat excessively drained soils formed in mixed alluvium under annual grasses and scattered oak cover. They are soils of poor fertility found on gently sloping floodplains.

Vitrandepts - (Click for full article)
Vitrandepts are moderately deep to deep, excessively drained soils formed in volcanic ash and cinders under brush and annual grasses. These soils are of very limited fertility found on or near areas of cinder cones.