Abstract
Belterra Clay is a uniform, yellowish kaolinitic clay lacking visihle stratification. It overlies laterite plateaus with a maximum thickness of 20 m. The clay is derived from a lateritic terrane occuring outside and within the Amazonian bauxite belt. Redistribution of clay material from the basal layers of the laterite zone by mud flow or sheet flood in a semiarid climate is suggested for the origin of Belterra Clay. Considering the history of Velhas surface a pliocene if not a mio-pliocene age for this clay cover cannot be ruled out.
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