الفهرس 
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Abstract
The large part of the Northern Western Desert of Egypt is covered by a thin
blanket deposit of Miocene rocks, forming a persistent limestone plateau known as the Marmarica (El-Diffa) Plateau. It extends nearly from the Libyan borders to
the western side of the Nile Valley and Delta and limited northward by the
Mediterranean coastal plain and southward by Qattara and Siwa depressions. This
plateau increases in thickness toward the north and the northwest with elevation gradually increases from the coastal plain of the Mediterranean Sea to approximately 200 m above sea level and then DROPs toward Qattara and Siwa
depressions. The Miocene rocks of this plateau are well developed in two
escarpments, one facing the sea between Salum and Sidi Barrani and the other one facing the Qattara and Siwa depressions.