Abstract
The Tarat Formation is composed at Arlit of three sequences consisting of sandstones and black mudstones rich in organic matter of continental origin. The three of them are interpreted as estuarine sediments deposited in different tectonic frame- works. Tlic Arlit Unit consisls of motley argillaceous sandstones deposited in a very flat lacustrine or alluvial environment and under an arid climate. These formations are separated by a fundamental discontinuity linked to the structuration of tlie Tim Ifersoi Trough. At regional scale, the sediments lying below this discontinuity are grouped in tectono-xdimentary supersequences, which are interpreted as biorhexistasic rhythms ; their deposition was horizontally directed by complex evolving synsedimentary tectonics controlled by the N-S In Azawa Lineament, and was influenced by the permanent proximity of a norllicrn sea. The sediments lying above the fundamental discontinuity belong to tlie i( Continental Intercalaire )) Supergroup ; their deposi!ion was influenced by the Tim Mersoi Trough. The whole Carboniferous sedimentation took place in a climatic context which evolved from cold (Lower Visean) to warm and arid (Upper Carboniferous) through temperate climates.
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