Abstract
The predominantly shaly Campano-Maastrichtian sediments in southeastern Nigeria contain thin beds of oolitic ironstone and coquina. Three facies are distinguished; Facies 1 - Beds (5 – 30 cm thick) of coquina within laminated black shale. Facies 2 - Beds (10 – 60 cm thick) of oolitic ironstone within grey shale. Facies 3 - Beds (35 – 80 cm thick) of fossiliferous, oolitic ironstone within black, finely laminated shale. These facies are evidence of recurring catastrophic events. They might have been deposited by small-scale storm-generating debris flows carrying the shoal (swell) sediments into the euxinic basin.
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