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The Bigbiga Limestone constitutes the lower member of the Aksitero Formation in Tarlac, which was subdivided by Schweller and others (1984) into two members. The 42-m thick Bigbiga consists of micritic limestone interbedded with tuffaceous turbidites. It was dated Late Eocene to Early Oligocene and the upper 78-m member was dated Middle to Late Oligocene. (see Aksitero Formation )

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