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The Voort Formation or Voort Member (Dutch: Formatie van Voort or Laagpakket van Voort; abbreviation in Belgium: Vo or in the Netherlands: VEVO) is a stratigraphic unit in the subsurface of north Belgium and the south of the Netherlands. The unit has the status of a formation in Belgium but is seen as a member of the Veldhoven Formation in the Netherlands. The Voort Formation consists of shallow marine sands with a late Oligocene age (Chattian stage, about 25 million years old).