The marginal marine conditions of the variegated shales were followed by a shallow sea in Late Campa

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• The marginal marine conditions of the variegated
  shales were followed by a shallow sea in Late
  Campanian time in which phosphate beds
  intercalated with clay, limestone and chert beds
  were deposited.
• In the belt which extends from Dakhla Oasis in
  the west (Abu Tartur Plateau) to Qusier in the
  east, the phosphate beds are well developed and
  assume economic importance.
• They are named Duwi (Phoshate) or Formation.

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• To the south of this belt, the phosphate beds do
  not form an important element in the formation
  and become indistinguishable from the overlying
  Dakhla Shale.
• The Late Campanian ammonites Libycoceras,
  Baculites and Solenoceras are usually recorded
  at the contact. The Dakhla (228 m in its type
  section) is made up of black to dark green shales
  and marls which carry biostromes of Exogyra
  overwegi of Maastrichtian age.
• These are followed upward by a thick shale
  section with minor calcareous sandstone beds
  carrying Cardita libyca of Early Paleocene age.

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