Palynology and Stratigraphy Relationship of the Facies Intertongueing between the Afikpo Sandstone and Nkporo Shale in the Cretaceous Anambara Basin, Southeastern Nigeria
nkporo group, intertongueing, afikpo sandstone, nkporo shale/afikpo sandstone
Abstract
Palynological research on ditch cutting samples from the upper part of the Ubiaja-1 well (40-1425ft) located in the western flank of the Anambra Basin Nigeria shows that sandstone of the Campanian to Early Maastrichtian age in Afikpo Basin has lateral extension into the Anambra Basin. Lithological description of the stratigraphic sequence indicates that the interval is characterized by nine different lithofacies units. These include granulestone, conglomeratic sandstone which are poorly sorted, thickly bedded and deposited in continental setting; pebble sandstone, coarse sandstone are also poorly sorted, with more pebble grains, deposited under high energy current in continental environment. Other lithofacies include claystone, mudstone, deposited in fluviatile environment; heterolith facies of various proportions of sand and shale comprising of shaly sand and sandy shale deposited in deltaic setting; followed by dark grey shale, deposited in the marginal marine environment. The sandstone facies is dated Campanian to Early Maastrichtian; equivalent to Afikpo Sandstone in the adjacent Afikpo Basin.
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2021-01-15
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