{"refrec":{"BRefID":231449,"RR":"<b>Sliwinska, K.K.; Heilmann-Clausen, C.</b> (2011). Early Oligocene cooling reflected by the dinoflagellate cyst <i>Svalbardella cooksoniae</i>. <i>Palaeogeogr. Palaeoclimatol. Palaeoecol. 305(1-4)</i>: 138-149. <a href=\"https://dx.doi.org/10.1016/j.palaeo.2011.02.027\" target=\"_blank\">https://dx.doi.org/10.1016/j.palaeo.2011.02.027</a>","BEntID":223161,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Palaeogeogr. Palaeoclimatol. Palaeoecol. 305(1-4)</i>: 138-149. <a href=\"https://dx.doi.org/10.1016/j.palaeo.2011.02.027\" target=\"_blank\">https://dx.doi.org/10.1016/j.palaeo.2011.02.027</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Sliwinska, K.K.; Heilmann-Clausen, C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Sliwinska, K.K.; Heilmann-Clausen, C.","Englishabstract":"The early Oligocene interval in several boreholes from the eastern North Sea and Denmark has been studied for dinoflagellate cysts. The cold water dinoflagellate cyst <i>Svalbardella cooksoniae</i> was recorded in a narrow lowermost Oligocene interval in all offshore sections. A critical evaluation of previous records of <i>Svalbardella cooksoniae</i> reveals that it is present in the same narrow interval of Chron 12r, close to the NP21/NP22 boundary in many high and mid latitude Northern Hemisphere sections, ranging from the Greenland Sea in the north to Italy in the south. The <i>Svalbardella cooksoniae</i> interval is closely associated with the LO of the dinoflagellate cyst <i>Areosphaeridium diktyoplokum</i>. The age of the <i>Svalbardella cooksoniae</i> event indicates that it is synchronous with the Oi1a oxygen isotope maximum of Pekar and Miller (1996) and Pekar et al. (2002). In the Danish land area the <i>Svalbardella cooksoniae</i> interval and hence the Oi1a event is shown to coincide with an unconformity. A regional comparison shows that synchronous unconformities are present also in Belgium and New Jersey. A slightly older regional unconformity occurring on both sides of the North Atlantic coincides with the Oi1 oxygen isotope maximum of Pekar and Miller (1996). The finding of a sedimentary package separated by two successive regional unconformities is interpreted to reflect a significant, temporary eustatic sea level rise, and hence a melting phase on the East Antarctic ice sheet between the Oi1 and Oi1a glacioeustatic sea level falls. The paleogeographic distribution and lower frequency of <i>Svalbardella</i> during the earliest Oligocene Oi1a event, as compared with the mid Oligocene Oi2b <i>Svalbardella</i> spp. event, suggest that the Oi1a glacial episode was less severe than the Oi2b glaciation. This is in agreement with recent ice volume estimates for the two events.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Early Oligocene cooling reflected by the dinoflagellate cyst <i>Svalbardella cooksoniae</i>","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-14 01:31:26.985992","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Dinoflagellate cysts; Eastern North Sea; Early Oligocene; Oila coolingevent; Paleoclimate; Sea level change; Svalbardella cooksoniae;Areosphaeridium diktyoplokum","OtherDescriptors":null,"Notes":null,"AnaPub":2011,"MonPub":null,"DateUpdate":"2022-02-09","DateCreate":"2013-12-01","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000291291000012","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.palaeo.2011.02.027"},"refs":null,"anarec":{"AnaID":231449,"PubliDate":2011,"Pagination":"138-149","XtraPublOfAnaID":null,"ISBN":null,"Volume":"305","Issue":"1-4","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43483,"SerRR":"Palaeogeography, Palaeoclimatology, Palaeoecology. 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