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Figure 2. Triangular diagrams showing the types of sandstones [(after Folk, 1968) (A)], and the provisional compositional fields indicative of sand derivation from different types of provenances [(after Dickinson et al., 1983) (B and C) and (after Dickinson,1982) (A, D, and E)] of Mesozoic and Cenozoic formations in Venture-B13 borehole, Venture Gas Field.