Abstract
The Cariri and Tacaratu formations are part of the Paleozoic basal units of the Araripe and Jatobá/Tucano Norte, and are historically interpreted as distant correlates of the Ipu Formation sediments (Parnaíba Basin). The Paleozoic lower units of the Brazilian cratonic basins are very important to understand and interpret initial sedimentation ages, paleogeography and depositional styles d…