What is "oxisol"

n. A soil type, containing at all depths no more than ten percent weatherable minerals, and low cation exchange capacity. They are always red or yellowish and best known for their occurrence in tropical rain forest.

Oxisols are an order in USDA soil taxonomy, best known for their occurrence in tropical rain forest, 15-25 degrees north and south of the Equator. They are classified as ferralsols in the World Reference Base for Soil Resources; some oxisols have been previously classified as laterite soils.