January 2013
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The paper presents the results of a calcareous nannofossil biostratigraphic study of 3 cores obtained from Indahag Limestone within the Laguindingan-Gitagum area in western Misamis Oriental, northern Mindanao. Based on the calcareous nannofossil assemblages and the occurrence of index markers like Discoaster pentaradiatus, Discoaster quadramus, Discoaster surculus, Discoastertamalis, Pseudoemiliania lacunosa, Sphenolithus abies and Reticulofenestra pseudo umbilicus, nannofossil zones NN1S-NN17 are recognized. This suggests an age of Early Pliocene to Late Pliocene for the Indahag Limestone, which is consistent with the age assignment provided to the formation by earlier studies.