The soils are generally nutrient-poor kaolinic soils and sandy podzols on the slopes.    From Wordnik.com.  [Uatuma-Trombetas moist forests] Reference

The rivers of the Park are lined with beaches of white sand and white nutrient-poor kaolinic hydromorphic soils during the dry season and flood over the surrounding forest during the wet season.    From Wordnik.com.  [Central Amazonian Conservation Complex, Brazil] Reference

These characteristics of the country rock, however, are likely to be masked at the outcrop by later weathering, which superposes a kaolinic or clayey alteration.    From Wordnik.com.  [The Economic Aspect of Geology] Reference