MICROFACIES ANALYSIS AND THE ENVIRONMENTAL PATTERN OF THE CHICHALI FORMATION, KALA CHITTA RANGE, PAKISTAN.

The Chichali Formation, a sequence of glauconitic sandstone and shale has been investigated from nine sedimentological sections from the Kala Chitta Range. Broadly speaking, four mirofacies have been identified The entire study has highlighted the depositional style of the Chichali Formation indicating that it has a variable environment of deposition from shallow marine to anoxic environment. The shallow marine environments are manifested by the presence of robust belemnites and ammonites in the glauconite bearing sequence, whereas, the presence of black shales are reminiscent of anoxic environment. The presence of age diagnostic fauna combined with palynological data establishes the Upper Jurassic to Lower Cretaceous age.