{"refrec":{"BRefID":219924,"RR":"<b>Sprong, J.; Speijer, R.P.; Steurbaut, E.</b> (2009). Biostratigraphy of the Danian/Selandian transition in the southern Tethys. Special reference to the Lowest Occurrence of planktic foraminifera <i>Igorina albeari</i>. <i>Geol. Acta 7(1-2)</i>: 63-77. <a href=\"http://dx.doi.org/10.1344/105.000000271\" target=\"_blank\">http://dx.doi.org/10.1344/105.000000271</a>","BEntID":211658,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Geol. Acta 7(1-2)</i>: 63-77. <a href=\"http://dx.doi.org/10.1344/105.000000271\" target=\"_blank\">http://dx.doi.org/10.1344/105.000000271</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Sprong, J.; Speijer, R.P.; Steurbaut, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Sprong, J. <i>et al.</i>","Englishabstract":"The P3a/P3b subzonal boundary is delineated by the lowest occurrence of <i>Igorina albeari</i>. Using literature, identification of the first representatives of <i>I. albeari</i> appeared to be very confusing. In this study descriptions of <i>I. albeari</i> are compared and a consistent definition is proposed. Igorinid specimens with an incipient keel are considered to be <i>I. albeari</i>. Flattening of the last chambers and the fusion of muricae on the peripheral margin may indicate such a slight keel. This keel enables an unambiguous distinction between <i>I. pusilla</i> and the first form of <i>I. albeari</i> and is in keeping with the original descriptions without introducing an intermediate species. In the southern Tethys, the lowest occurrence of <i>I. albeari</i> occurs just prior to the pinkish-brown marl bed in Egypt and immediately overlies the glauconitic bed in Tunisia. Furthermore, the NTp7A/NTp7B subzonal boundary, delineated by the lowest occurrence of <i>Chiasmolithus edentulous</i>, is in close correlation with these marker beds. In Egypt <i>C. edentulous</i> appears 1 m below the entry of <i>I. albeari</i>, whereas in Tunisia they coappear. This implies significant erosion at the glauconitic bed in the studied parts of the Tunisian Trough and a more complete succession at the dark-brown marl bed in the Nile Valley. These marker beds can also be correlated to a level of minor lithologic change in the upper part of the Danian Limestone Formation in the Zumaia section through the lowest occurrence of <i>Chiasmolithus edentulous</i>. The distinct lithologic change in Zumaia, from the Danian Limestone to the Itzurun Formation, however, appears to be ~600 kyr younger than what we now call upper Danian event beds, in Tunisia and Egypt.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Biostratigraphy of the Danian/Selandian transition in the southern Tethys. 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