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Busuanga Island is considered an accretionary complex primarily composed of Middle Permian to Jurassic chert (Liminangcong Formation), Middle Jurassic to Early Cretaceous elastics (Guinlo Formation) and limestone units of various ages, with minor melange bodies (Bicatan Melange), collectively called as the Malampaya Sound Group. These rocks are regarded as off scraped sedimentary deposits from a subducted oceanic plate that developed imbricate structure during the Jurassic-Early Cretaceous accretion. The lithologic transition from chert to siliceous mudstone to terrigenous elastics indicates facies change from pelagic to terrigenous condition brought by a plate movement from an open ocean to the subduction zone. The siliceous mudstone units, which mark the end of chert deposition and the beginning of clastic deposition, are classified into three different ages in Busuanga Island, and found to be younging from north to south. This provides a major basis for de亜ning three belts composing Busuanga Island :the Northern, Middle and Southern Busuanga belts. The Northern Busuanga Belt is composed of Middle Permian to Middle Jurassic (probably Aalenian) chert followed by Bathonian-Callovian (JR4-JR5) siliceous mudstone and Callovian (JR5) terrigenous elastics. T顛e Middle Busuanga Belt has its topmost chert deposit at Bajocian-lower Bathonian (JR4), siliceous mudstone interval from upper Bathonian to lower Oxfordian (JR5-JR6), and terrigenous elastics at Oxfordian (JR6). The Southern Busuanga Belt shows the transition from lower-middle Tithonian (JR8) chert to upper TithonianBernasian (KRl) siliceous mudstone. The subsequent deposition of terrigenous elastics, supposedly overlying the siliceous mudstone, is considered occurring within the Lower Cretaceous. The off scrape accretion period of these three belts probably occurred during the Middle Jurassic for the Northern Busuanga Belt, Late Jurassic for the Middle Busuanga Belt and Early Cretaceous for the Southern Busuanga Belt. These chert-clastic sequences of the Malampaya Sound Group are also found correlative with the Togano Group of the Southern Chichibu Terrane of SW Japan.

Malampaya Sound Group : a Jurassic-Early Cretaceous accretionary complex in Busuanga Island, North Palawan Block (Philippines)