Abstract
The Eocene Ameki Formation of the Afikpo syncline in southeastern Nigeria is composed of sandstones and mudrocks. In its type area, five sedimentary facies are distinguished; these are in ascending order: (1) very fine to fine-grained calcareous quartz arenites; (2) fine to coarse, pebbly, bioturbated quartz arenites; (3) grey to dark, silty, fossiliferous shale; (4) very fine to fine-grained, argillaceous sandstone; and (5) fine to coarse pebbly, quartz arenites. Based on an integrated study of lithologic successions, sedimentary features and faunal distribution in each facies, two main environments of deposition of the Ameki sediment may be suggested: near-shore and marine. Each of these environments may be further subdivided into subtidal and intertidal zones of the marine environment, and barrier ridge, lagoon pond, marginal lagoon and beach of the near-shore environment. The overall dynamics of the environment seems to fit best a landward migrating barrier ridge-lagoon complex.
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