On the low littoral zone the coast produced a rich tropical bush, in which the mangrove is very prominent.
Archean rocks form the cores of the ancient crystalline masses within the littoral zone from Algiers to Bona.
The Oligocene period consists of a marine phase confined to the littoral zone of Kabylia, and of a continental phase occupying vast areas composed of lacustrine, alluvial, gypsiferous marls, sandstones and conglomerates.
The littoral zone contains the only fossiliferous strata.
