Correlation of Late Cretaceous Continental Vertebrate Assemblages in Middle and Central Asia
详细信息
- 责任者：A. Averianov (Zoological Institute ; Russian Academy of Sciences ; Universitetskaya nab.1 ; Saint Petersburg 199034 ; Russia) ; H.-D.Sues
- 刊名：Journal of Stratigraphy
- 出版年：2012
- 卷期：36(2)
- 关键词：脊椎动物 ; Vertebrata ; 晚白垩世 ; Upper Cretaceous ; 地层对比 ; stratigraphic correlation ; 亚洲 ; Asia
- 页码：p.462-485
- 图表：13 illus., 1 table, 172 refs.
- 分类号：1200
- issnNo：ISSN0253-4959
- isbnNo：CN32-1187/P
摘要
///The relative stratigraphic positions of the better-known assemblages of Late Cretaceous continental vertebrates from Middle and Central Asia are assessed by parsimony analysis of the presence/absence of 26 proposed biostratigraphic marker taxa.The oldest assemblage in the region is Khodzhakul from the Kyzylkum Desert of Uzbekistan(early Cenomanian).The next stage includes assemblages from the lower and upper parts of the Bayn Shire Formation of the eastern Gobi Desert,Mongolia(Cenomanian to Santonian).The Iren Dabasu fauna from Inner Mongolia,China,clusters with the Turonian-Santonian faunas from Middle Asia based on the shared presence of the trionychid turtle Khunnuchelys and is likely Santonian in age.Three Middle Asian assemblages(Bissekty,Yalovach,and Bostobe) are endemic in the presence of two crocodyliform taxa(Kansajsuchus and Tadzhikosuchus) but share another crocodyliform(Shamosuchus) with the Gobi assemblages.The Campanian-Maastrichtian assemblages from the Gobi Desert cluster with coeval North American faunas.The Campanian vertebrate assemblages from the Djadokhta and Barun Goyot formations are highly endemic,reflecting semi-arid paleoenvironments.The assemblage from the Nemegt Formation,which existed under more mesic conditions,is similar in composition to those from other fluvial depositional environments(Bissekty,Iren Dabasu,and North American Judithian and Lancian assemblages).The presence of the crested hadrosaurine Saurolophus supports a Maastrichtian age for the Nemegt assemblage.Three Gobi assemblages(Djadokhta,Barun Goyot,and Nemegt) are grouped together based on the shared presence of the endemic turtle Mongolemys and parvicursorine theropods.The Campanian to Maastrichtian assemblages of Central Asia and North America differ from the older assemblages in Asia in the presence of derived Tyrannosauridae,Pachycephalosauria,and Hadrosauridae.In Middle Asia,continental vertebrate assemblages from this time interval remain largely unknown due to regional marine transgressions.