The present study depends on qualitative and quantitative analyses for the Late Paleocene-Early Eocene benthonic
foraminifera at Darb Gaga area, Baris Oasis, Western Desert, Egypt. The study Late Paleocene-Early
Eocene succession consists of two rock units; Esna Formation at base and Thebes Formation (lowermost part) at
top. Esna Formation is subdivided into four members stratigraphically arranged as follow: El Hanadi, Dababiya
Quarry, Darb Gaga and Abu Had. Dababiya Quarry Member (marker of the P/E boundary) is characterized by
the occurrence of glauconitic grains at the base confirming a minor hiatus at the P/E boundary. This hiatus led to
the missing of the beds no. 1 & 2 of the five beds (lowermost part) of Dababiya Quarry Member. Four benthonic
foraminiferal events are defined during the Late Paleocene-Early Eocene interval. The first one is global event at
the Paleocene/Eocene (P/E) boundary, and the remainder events are local and define during the Ypresian (Early
Eocene). The first event is characterized by a rapid extinction and abrupt faunal changes for the benthonic
foraminiferal assemblages. This event led to the extinction of about 80% of the Paleocene foraminiferal taxa.
About 72% of these taxa are temporarily extinct and reappeared soon. This event is characterized by carbonate
dissolution which suggesting oxygen deficiency of oceanic bottom waters and food supply changes. Afterwards, a
recovery phase of the benthonic foraminifers is directly recorded above this event and probably due to improved
depositional environmental conditions. Quantitative analyses of benthonic foraminiferal assemblages at Darb
Gaga section, suggest an outer shelf paleoenvironmental setting during the deposition of El Hanadi, Dababiya
Quarry and Darb Gaga sediments that changes to inner-middle shelf during the deposition of Abu Had Member
and inner shelf of Thebes Formation. This succession is subdivided into four depositional sequences which are
bracketed by unconformities and their correlative conformities depending on integrated field investigations,
lithofacies and biofacies data. These sequences are controlled by sea-level changes and/or tectonic activities that
prevailed during the deposition.