000161109 001__ 161109 000161109 005__ 20251017144640.0 000161109 0248_ $$2sideral$$a78142 000161109 037__ $$aART-2012-78142 000161109 041__ $$aeng 000161109 100__ $$aBerggren,W. A. 000161109 245__ $$aThe dababiya corehole, upper Nile valley, Egypt: Preliminary results 000161109 260__ $$c2012 000161109 5060_ $$aAccess copy available to the general public$$fUnrestricted 000161109 5203_ $$aThe Dababiya corehole was drilled in the Dababiya Quarry (Upper Nile Valley, Egypt), adjacent to the GSSP for the Paleocene/ Eocene boundary, to a total depth of 140 m and bottomed in the lower Maastrichtian Globotruncana aegyptiaca Zone of the Dakhla Shale Formation. Preliminary integrated studies on calcareous plankton (foraminifera, nannoplankton), benthic foraminifera, dinoflagellates, ammonites, geochemistry, clay mineralogy and geophysical logging indicate that: 1) The K/P boundary lies between 80.4 and 80.2 m, the Danian/Selandian boundary between ~ 41 and 43 m, the Selandian/Thanetian boundary at ~ 30 m (within the mid-part of the Tarawan Chalk) and the Paleocene/Eocene boundary at 11.75 m (base [planktonic foraminifera] Zone E1 and [calcareous nannoplankton] Zone NP9b); 2) the Dababiya Quarry Member (=Paleocene/Eocene Thermal Maximum interval) extends from 11.75 to 9.5 m, which is ~1 m less than in the adjacent GSSP outcrop.; 3) the Late Cretaceous (Maastrichtian) depositional environment was nearshore, tropical-sub tropical and nutrient rich; the latest Maastrichtian somewhat more restricted (coastal); and the early Danian cooler, low(er) salinity with increasing warmth and depth of water (i.e., more open water); 4) the Paleocene is further characterized by outer shelf (~ 200 m), warm water environments as supported by foraminifera P/B ratios > 85% (~79-28 m), whereas benthic foraminifera dominate (>70%) from ~27-12 m (Tarawan Chalk and Hanadi Member) due, perhaps, in part to increased dissolution (as observed in nearby outcrop samples over this interval); 5) during the PETM, enhanced hydrodynamic conditions are inferred to have occurred on the sea-floor with increased river discharge (in agreement with sedimentologic evidence), itself a likely cause for very high enhanced biological productivity on the epicontinental shelf of Egypt; 6) correlation of in situ measured geophysical logs of Natural Gamma Ray (GR), Single-Point Resistance (PR), Self-Potential (SP), magnetic susceptibility (MS), and Resistivity, and Short Normal (SN) and Long Normal (LN) showed correspondence to the lithologic units. The Dababiya Quarry Member, in particular, is characterized by very high Gamma Ray and Resistivity Short Normal values. 000161109 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es 000161109 590__ $$a0.538$$b2012 000161109 591__ $$aGEOSCIENCES, MULTIDISCIPLINARY$$b151 / 172 = 0.878$$c2012$$dQ4$$eT3 000161109 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000161109 700__ $$0(orcid)0000-0002-8801-9544$$aAlegret,L.$$uUniversidad de Zaragoza 000161109 700__ $$aAubry,M. -P 000161109 700__ $$aCramer,B. S. 000161109 700__ $$aDupuis,C. 000161109 700__ $$aGoolaerts,S. 000161109 700__ $$aKent,D. V. 000161109 700__ $$aKing,C. 000161109 700__ $$aKnox,R. W. O. 000161109 700__ $$aObaidalla,N. 000161109 700__ $$aOrtiz,S. 000161109 700__ $$aOuda,K. A. K. 000161109 700__ $$aAbdel-Sabour,A. 000161109 700__ $$aSalem,R. 000161109 700__ $$aSenosy,M. M. 000161109 700__ $$aSoliman,M. F. 000161109 700__ $$aSoliman,A. 000161109 7102_ $$12000$$2655$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Paleontología 000161109 773__ $$g105, 1 (2012), 161-168$$pAustrian j. earth sci.$$tAUSTRIAN JOURNAL OF EARTH SCIENCES$$x0251-7493 000161109 8564_ $$s1408491$$uhttps://zaguan.unizar.es/record/161109/files/texto_completo.pdf$$yVersión publicada 000161109 8564_ $$s2448155$$uhttps://zaguan.unizar.es/record/161109/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000161109 909CO $$ooai:zaguan.unizar.es:161109$$particulos$$pdriver 000161109 951__ $$a2025-10-17-14:31:33 000161109 980__ $$aARTICLE