Abstract
The Obi—Lafia area is part of the Benue Valley where the Nigerian Steel Development Authority is currently involved in exploration for coal. Boreholes in the area range between 200–500 m. The rock units are mainly shales, sandstones, limestones and coal with transitional zones in between. The stratigraphy of this area is based on palynological studies using the constituent miospores. Quantitative analysis of the miospores shows that the total number of species per sample is less than 100. However, the following have been identified in this area: Araucariacites, Classopollis classoides, Tricolpites, Tricolpoporopollenites, Matonisporites, Syncolporites form A, Monocolpopollenites, Triorites, Ephedripites, Granulatisporites, Droseridites senonicus, Cicatricosisporites. Marine palynomorphs (dinoflagellates and microforaminifera) are also present, but the stratigraphic zonation and age determination are based on miospores. Three assemblage zones based on some index miospores have been established. Also recognised are the three Senonian substages, (1) Coniacian (2) Santonian (3) Campanian.
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