Fig. 8From: Palynomorph assemblage biozonation of Paleogene strata in Bende–Umuahia Area, Niger Delta Basin, southeastern NigeriaMicrographs of some spores and pollen grains from the Imo Formation. 1 – Proxapertites operculatus Germeraad, Hopping and Muller 1968 (70–80 μm); 2 – Bombacidites annae (Van der Hammen 1954) Leidelmeyer 1966 (37–40 μm); 3 – Mauritidiites crassiexinus Jan du Chêne, Onyike, and Sowunmi 1978 (45–50 μm); 4 – Spinizonocolpites baculatus Muller 1968 (60 × 55 μm); 5 – Proxapertites cursus Van Hoeken-Klinkenberg 1966 (75–85 μm); 6 – Mauritidiites crassibaculatus Van Hoeken-Klinkenberg 1964 (60 × 31 μm); 7 – Echitriporites trianguliformis Van Hoeken-Klinkenberg 1964 (26 μm); 8 – Foveotricolporites crassiexinus Van Hoeken-Klinkenberg 1966 (25 × 23 μm); 9 – Retistephanocolpites williamsi Germeraad, Hopping and Muller 1968 (36 μm); 10 – Grimsdalea polygonalis Jan du Chêne, Onyike, and Sowunmi 1978 (47–62 μm). Bar scale = 20 μmBack to article page