Abstract

The late Jurassic/early Cretaceous formations of southeastern Tunisia (Tataouine area), previously known for their richness in fossil wood, have recently given numerous levels with diversified plant imprints. These plant levels (wood and/or imprints) are generally located a top regional subaerial unconformities. Above each of them, sand and conglomerate are deposited by channelized fluvial system. Vegetation settled rapidly on these deposits and paleosoils were formed. The observation of numerous autochthony indexes confirms the rapid development of these soils, and their subsequent covering by first transgressive sand levels. A classification of these plant levels is proposed, in relation with their increasing autochthony index. Six types are defined. The distribution of these plant levels is related to sequential evolution of the deposits.

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