The easternmost occurrence of Mammut pacificus (Proboscidea: Mammutidae), based on a partial skull from eastern Montana, USA

PeerJ

article

Andrew T. McDonald¹  Amy L. Atwater²  Alton C. Dooley Jr¹  Charlotte J.H. Hohman² 

[1] Western Science Center;Museum of the Rockies, Montana State University;Department of Earth Sciences, Montana State University

关键词: Mammut pacificus;    Mammutidae;    Montana;    Irvingtonian;    Pleistocene;   

DOI  :  10.7717/peerj.10030

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Mammut pacificus is a recently described species of mastodon from the Pleistocene of California and Idaho. We report the easternmost occurrence of this taxon based upon the palate with right and left M3 of an adult male from the Irvingtonian of eastern Montana. The undamaged right M3 exhibits the extreme narrowness that characterizes M. pacificus rather than M. americanum. The Montana specimen dates to an interglacial interval between pre-Illinoian and Illinoian glaciation, perhaps indicating that M. pacificus was extirpated in the region due to habitat shifts associated with glacial encroachment.

【 授权许可】

CC BY