The marine conditions became
progressively more restricted, with many small seas and
lagoons sporadically replenished with normal sea water. It
gave rise to the shallowing-upward cyclic deposition of
evaporites in Middle Miocene Fat’ha (Lower Fars) Formation.
The marginal parts of the Fat’ha basin are dominated by
clastics represented by fine sandstones and silty claystones
occupying the upper two-thirds of the sequence of the upper
unit of the formation. These clastics were deposited in
fluvially-dominated delta (Al-Juboury and McCann, 2008;
Al-Juboury et al., 2001; Al-Naqib and Aghwan, 1993).