Kaolinite dating from Acrisol and Ferralsol: A new key to understanding the landscape evolution in NW Amazonia (Brazil)

•Ferralsols and Acrisols are major types of tropical regoliths in the Amazon Basin.•EPR dating of kaolinites is used on a ferralsol and an acrisol regolith from NW Brazil.•The acrisol regolith contains older kaolinites than the quaternary ferralsol regolith.•This data set confirms that soil and saprolite are distinct systems.•It confirms the local models describing the link between soils and relief evolution.