Dinoflagellate cyst assemblages of the Cunga - Quifangondo cenozoic formations in the Cabo São Brás section, Kwanza Basin (Angola): towards a first stratigraphic and paleoenvironmental interpretation

This work introduces one of the first palynostatigraphic study conducted on formations from Eocene and overlying lowermost Miocene successions (Cunga Quifangondo formations) exposed in Onshore Kwanza Basin, Angola. To improve Cunga age, new biostratigraphic correlations palaeoenvironmental interpretations based qualitative quantitative analyses organic walled dinoflagellate cysts sedimentary rocks sampled Cabo de São Brás section were obtained. Those works have revealed that Formation could be assigned to a middle - early Oligocene with palynomorph signature typical outer neritic oceanic environments (dominance dinocysts microforaminiferal linings radiolarian pyritized fragments). The lower late (latest Chattian) (Aquitanian) ages. assumption is occurrence Ectosphaeropsis burdigalensis, last Deflandrea spp. Chiropteridium galea. Additionally, Chiropteridium, Distatodinium, Homotryblium, Hystrichokolpoma Lingulodinium acme endorses latest Chattian-early Aquitanian age these samples. this unit reflects an environment. Oligocene/early overlaps unconformably strata Formation, pointing out hiatus between two units.