{"refrec":{"BRefID":8793,"RR":"<b>Hirano, H.</b> (1993). Phyletic evolution of desmoceratine ammonoids through the Cenomanian-Turonian oceanic anoxic event, <b><i>in</i></b>: House, M.R. (Ed.) <i>The Ammonoidea: environment, ecology, and evolutionary change.</i> pp. 267-283","BEntID":8793,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":", <b><i>in</i></b>: House, M.R. (Ed.) <i>The Ammonoidea: Environment, ecology, and evolutionary change. The Systematics Association Special Volume,</i> 47: pp. 267-283","DocTypID":17,"DocType":"Book chapters","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Hirano, H.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Hirano, H.","Englishabstract":"Samples were obtained from the anoxic and oxic beds in and around the Cenomanian-Turonian (C/T) boundary of Tunisia and south-east France, and sulphur content was confirmed as a reliable index of anoxic conditions. Using this, the anoxic conditions of the black shale in the Cenomanian - Turonian boundary were confirmed for the Yezo Supergroup, Hokkaido, Japan which was a sequence deposited in the outer shelf to the upper shelf-slope basin of a fore-arc basin. The phyletic speciation from the Cenomanian <i>Desmoceras</i> (<i>Pseudouhligella</i>) <i>japonicum</i> to Turonian <i>Tragodesmoceroides subcostatus</i> arose at the C/T boundary in the northwestern Pacific. It is reasonably explained in relation to the oceanic anoxic conditons that most <i>D. (P.) japonicum</i> populations died out at the end of the Cenomanian and <i>T. subcostatus</i> phyletically arose from a small population of the former which had successfully taken refuge in shallower waters. The distribution of the descendant species was limited to shallower waters than the ancestral species.","AbstractOtherLang":null,"BibLvlCode":"AMS","StandardTitle":"Phyletic evolution of desmoceratine ammonoids through the Cenomanian-Turonian oceanic anoxic event","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-08 01:30:37.439852","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1993,"MonPub":null,"DateUpdate":"2001-05-10","DateCreate":"2001-05-10","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":8793,"PubliDate":1993,"Pagination":"267-283","XtraPublOfAnaID":null,"ISBN":"0-19-857765-6","Volume":"47","Issue":null,"BRefMon":8735,"BRefMonRR":"<b>House, M.R. (Ed.)</b> (1993). 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