English: Cores from a quaternary lagoonal "chott" in Tunisia, showing two typical "shallowing upward" sequences, from marine (in blue) to intertidal - supratidal (yellow) environments with algal mats. Black soil at the top. See Davaud, Strasser & M'Rabet (field book,1991), Identical sequences were described by Septfontaine (1985) in the middle Liassic of Morocco, in an autocyclic context. Abundant displaced foraminifera (orbitopsellids), by hurricanes and tidal currents, were also observed on top of sequences, as in the recent tunisian analogue.