Climate affects the sand composition by influencing on
pedogenic processes which brings about parent-rock destruction
(Suttner and Dutta, 1986). To discriminate the paleoclimatic
conditions affecting the studied sandstones, the
following is used as a sensitive discriminator of sandstones
with different climate heritage (Fig. 8): a log/log plot of the
ratio of total quartz (Q) to total feldspar (F) plus rock
fragments (L) against the ratio of total polycrystalline quartz
(Qp) to total feldspar plus rock fragments given by Suttner
and Dutta (1986). The Injana sandstones plot in arid to
semi-arid fields, whereas the Fat’ha samples plot in semi-humid
field. Arid conditions may favor the dominance and
preservation of unstable lithic fragments and feldspars in the
studied sandstones.