Abstract
Early Tertiary carbonates (Gebel Abyad Formation) are described from an isolated limestone plateau from the northwestern Sudan. They represent the southernmost outskirts of marine, Tertiary sediments in northeast Africa, which can be connected with transgressive/regressive cycles of the Tethys onto the African craton. Microfacies studies of the carbonates yielded exclusively shallow marine sediments which dried up temporarily, and with changing rates of terrigenous input. They contain a low diverse fauna and flora, poor in individuals. The paleogeographic reconstruction of this isolated occurrence was possible by comparing sediments from southern Egypt.
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