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Madagascar is the result of the breaking up of the Gondwana land. It is constituted by two main geological entities:

  • polystructured crystalline unity, which would be older than 500 millions years, called “Madagascar Precambrian crystalline basement”, it forms the crystalline core of the island and crops out on the 2/3 of its surface
  • the sedimentary series, none metamorphosed and little bit deformed, lay on the crystalline basement. It is more developed in the West than in the East.

SYNTHETIC GEOLOGICAL MAP
(Ministry of Mines and Energy-DMG)