*1.2.2. Sidi Salem formation (Middle miocene)*

The lower limit of this formation is not known in the central part of the Nile Delta where it overlies the Moghra Formation to the west and south. Sidi Salem Formation is composed mainly of mudstone with interbeds of marls, sandstones and siltstones. This formation


**Figure 3.** Lithostratigraphic succession of Northern Nile Delta, Egypt modified from Kamel et al. [8].

corresponds to a lower neritic slope environment. Sidi Salem Formation is unconformably overlained by Abu Madi Formation.
