In the Thamad area, east central Sinai, two stratigraphic sections are measured and sampled; Gebel El Mishiti and G. El Keeh, in order to determine the nannofossil biostratigrapy of the Paleocene-lower Eocene rocks. Gebel El Mishiti section is considered one of the most complete sections across the K/P boundary in Egypt where all the exposed rocks at G. El Keeh belong to the lower Eocene Egma Formation.A nearly complete sucession of Paleocene nannofossil biozones is recorded from the Esna Formation at G. El Mishiti. They are arranged from base to top as follows: Markalius inversus (NP1), Cruciplacolithus tenuis (NP2), Chiasmolithus danicus (NP3), Ellipsolithus macellus (NP4), Fasciculithus tympaniformis (NP5), Heliolithus kleinpellii (NP6), Discoaster mohleri (NP7/8) and Discoaster multiradiatus (NP9) zones.The Danian/Selandian boundary is located at the base of Zone NP5 at the level of the first appearance of Fasciculithus taxa. The Selandian/Thanetian boundary can be traced tentatively at the base of the Discoaster mohleri Zone (NP7/8). The Paleocene/Eocene boundary is traced between the NP9a/NP9b subzonal boundary which is marked by the first appearances of Discoaster araneus, Rhomboaster calcitrapa, R. bitrifida and R.cuspis. The Paleocene /Eocene boundary lies within the upper part of the Esna Formation.
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