Authors: Brinkman, Donald B.; Tarduno, John A.

Source: Canadian Journal of Earth Sciences, Volume 42, Number 12, December 2005 , pp. 2073-2080(8)

Publisher: NRC Research Press

Abstract:

Three turtles are present in a Turonian–Coniacian age high-latitude vertebrate assemblage from Axel Heiberg Island: Borealochelys axelheibergensis gen. et sp. nov., a generically indeterminate eucryptodire, and a trionychid. The assemblage differs from most Late Cretaceous turtle assemblages from North America in that members of the Paracryptodira are absent. The absence of this group is interpreted as a result of latitudinal differentiation of turtle assemblages in North America during the Late Cretaceous. The level of diversity of turtles in the Axel Heiberg assemblage is comparable to that of mid-latitude assemblages associated with a mean annual paleotemperature of 14 °C, adding to the evidence for high mean annual temperatures at high latitudes during Turonian–Coniacian times.

Trois tortues sont présentes dans un assemblage de vertébrés (Turonien–Coniacien) provenant d'une latitude élevée, l'île Axel Heiberg : Borealochelys axelheibergensis n. gen., n. sp., un eucrytodiré génériquement indéterminé et un trionychidé. L'assemblage diffère de la plupart des assemblages de tortues de l'Amérique du Nord en ce que les membres de Paracryptodira sont absents. L'absence de ce groupe est interprétée comme une différenciation latitudinale des assemblages de tortues en Amérique du Nord au Crétacé tardif. Le niveau de diversification de l'assemblage Axel Heilberg est comparé aux assemblages à latitudes moyennes associées à une paléotempérature moyenne annuelle de 14 ºC, ajoutant aux évidences de températures moyennes annuelles élevées à l'époque du Turonien–Coniacien.[Traduit par la Rédaction]

Document Type: Research article

Publication date: 2005-12-01

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