Proposition d’une échelle chronométrique autour de la limite Crétacé-Paléogène par cyclostratigraphie : coupe de l’Aïn Settara (Kalaat Senan, Tunisie centrale)

Palaega Rugosa, a New Species of Fossil Isopod (Crustacea) From Maastrichtian Rocks of Tunisia

“…From a biostratigraphic point of view, the isopod specimen was found within the Plummerita hantkeninoides Foraminiferal Biozone and the CC26 Nannofossil association (Robaszynski et al, 2000), both indicating a late late Maastrichtian age for the isopod specimen. The cyclostratigraphic framework of Hennebert and Dupuis (2003) places the 7 m below the K/P boundary, within which the isopod was found, at about 90 Ka before the K/P boundary. Wieder and Feldmann, 1989; Palaega guadalupensis Rathbun, 1935; Palaega huetteri Fraaye and Summesberger, 1999; Palaega ilerdensis Calzada and Gomez Pallerola, 1994; Palaega jurassica Stolley, 1910; Palaega kessleri Reiff, 1936;Palaega kunthi Von Ammon, 1882; .…”

Planktonic foraminiferal biostratigraphy and quantitative analysis during the Campanian-Maastrichtian transition at the Oued Necham section (Kalâat Senan, central Tunisia)

“…Geologically, the Kalâat Senan area extends over the south-eastern side of a NE-SW trending Cretaceous-Eocene syncline (Figure 1), which belongs to the Central Tunisian Atlassic domain (Castany, 1951). As a part of the southern margin of the Palaeo-Tethys (Figure 2) during the Cretaceous, the north-western segment of this structural unit acted as connected deep basins known as the "Tunisian trough", which was characterised by subsidence and sediments rich in pelagic fauna (Burollet, 1956;Salaj, 1980;Turki, 1985;Maamouri et al, 1994;Rami et al, 1997;Robaszynski et al, 2000;Steurbaut et al, 2000;Bouaziz et al, 2002;Jarvis et al, 2002;Hennebert and Dupuis, 2003;Zaghbib-Turki, 2003;El Amri and Zaghbib-Turki, 2005;Guasti et al, 2006;Hennebert et al, 2009). Among the sediments that were deposited within the trough area, those that are now exposed at the Oued Necham section (with the geographical coordinates X = 35°46′28.3″N and Y = 8°28′55.7″E) provide a coherent and continuous Campanian-Maastrichtian transition.…”

Ammonites on the Brink of Extinction: Diversity, Abundance, and Ecology of the Order Ammonoidea at the Cretaceous/Paleogene (K/Pg) Boundary

“…For example, in the Tunisian Trough Basin, the highest ammonites occur 1 m below the boundary (Goolaerts 2010a). Based on a cyclostratigraphic study of the alternation of limestones and marls at this site (Hennebert and Dupuis 2003), these ammonites were probably deposited at approximately 50 kyr prior to the K/Pg boundary. In the Bay of Biscay, ten species are present in the top 1.5 m of the section, and one species is present in the top 10-15 cm of the section (Ward and Kennedy 1993).…”

“…Ammonites occur as high as 1-2 m below the boundary at El Kef (GSSP section), Kalaat Senan (Aïn Settara, Tabet Zaara, and Oued Raïne sections), and Garn Halfaya (Garn section), although almost all of the specimens occur as surface float and may have moved slightly downslope. The highest ammonite occurs 1 m below the boundary at Garn Halfaya, which is approximately equivalent to 50 kyr prior to the end of the Cretaceous based on the cyclostratigraphic data of Hennebert and Dupuis (2003). All of the reported ammonites occur in the highest ammonite zone, the Indoscaphites pavana Assemblage Zone, which represents approximately the last 420 kyr of the Maastrichtian based on the cyclostratigraphy of Hennebert and Dupuis (2003) and Hennebert (2012).…”

“…The highest ammonite occurs 1 m below the boundary at Garn Halfaya, which is approximately equivalent to 50 kyr prior to the end of the Cretaceous based on the cyclostratigraphic data of Hennebert and Dupuis (2003). All of the reported ammonites occur in the highest ammonite zone, the Indoscaphites pavana Assemblage Zone, which represents approximately the last 420 kyr of the Maastrichtian based on the cyclostratigraphy of Hennebert and Dupuis (2003) and Hennebert (2012). In the Dababiya Quarry Corehole, specimens occur within Calcareous Nannofossil Zone CC26b Berggren and Ouda 2013;.…”