Soils of California
2,928 soil series mapped on 54.80 million acres
Alfisols — moderately leached soils with a clay-enriched subsoil
The state soil, San Joaquin, ranks 13th of 2,928 series here on 297,401 acres. First place goes to Cajon, an Entisol covering 1.4% of the state’s mapped soil. No order holds a majority; Mollisols lead with 24.2%, ahead of Entisols at 23.6%. Its soil survey names 2,928 series, more than any other state or territory here.
Atlas series mapped in CaliforniaGuide: state soils and where series began