Bohol must have been developed from the magmatic tectonic mechanism which resulted from the underthrusting of the southwest Philippine Plate east of Samar and Surigao. The Alicia Schist, the oldest known rock formation in the island, is inferred to be part of the Bohol crustal rocks before plate interactions. All the succeeding igneous extrusive and intrusive events in Bohol are the results of these resurging interactions. Ongoing erosion, transport and sedimentation continue to accumulate marine and terrestrial deposits in the Bohol basin.
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