A secondary basin corresponds with a second order depositioual cycle, is limited by two erosional surfaces which are also the boundaries of a seismic sequence. In other words, a secondary basin is a component of an overall sedimentary basin. A secondary basin is formed at the same time with a tectonic phase where the tlu·ee most important factors are faulting, subsidence and uplifting. Basin-forming faults are usually normal faults and are called "syn-depositional fault". The reconstruction of a sedimentary basin, is rather complicated, but it is very necessary for basin ànalysis, facial analysis and compilation of· lithofacies-paleogeographic maps, as the dimensions and.
