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GENESIS OF ASPHALT Most geologists, based on many evidences suggest a theory that the asphalt in Buton island originates from crude oil in the depth that migrates upwards along deep seated faults and finally deposited asphalt vertically and laterally in the upper beds after the lighter fractions evaporate. In some places the light and heavy viscous asphalt are presently continuing oozing onto the exposed rock face on the surface. Only one geologist defends a thesis stating that the asphalt in Buton was formed in the layers on in situ from organic materials called proto-bitumen without forming an oil phase. According to the theory of plate tectonic, Buton Island is still subjected by regional pressure and as a consequence the formed asphalt and oil moves up continuously to the surface.
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