Abstract

An outcrop investigation of Moghra Formation (Lower Miocene, Burdigialian age) was carried out in northwestern Egypt. Eighteen detailed sedimentary measured sections, located slightly obliquely to the depositional strike were described. Emphasis was placed on lithofacies variations, interpretations of depositional settings and a depositional model was constructed. In the study area, The Moghra Formation, some 260 m thickn, consists of eight lithofacies associations: (1) Tide-influenced fluvial channel deposits; (2) Flat laminated sandflat deposits; (3) Outer estuary sand bar deposits (Tidal Channel and Tidal Bars); (4) Tidal flat deposits; (5) Bioturbated fossiliferous shelf sandstones; (6) Bioturbated fossiliferous shelf carbonates; (7) Coarsening upward deltaic deposits; and (8) Fining upward channel deposits. These eight lithofacies associations are grouped into three main depositional environments: (1) Transgressive tide-dominated estuaries, (2) Open Shelf and (3) Regressive tide-dominated deltas.

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