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A new Early Eocene (Lostcabinian) mammal assemblage from the Main Body of the Wasatch Formation, Northern Green River Basin; The Pinnacles, Sweetwater Co., Wyoming Open Access


Other title
Green River Basin
Type of item
Degree grantor
University of Alberta
Author or creator
Neumann, Allison Marie
Supervisor and department
Zonneveld, John-Paul (Department of Earth and Atmospheric Sciences)
Examining committee member and department
Gingras, Murray (Department of Earth and Atmospheric Sciences)
Pemberton, George (Department of Earth and Atmospheric Sciences)
Department of Earth and Atmospheric Sciences

Date accepted
Graduation date
Master of Science
Degree level
Taphonomy of fluvially deposited microvertebrates and systematic paleontology of the Pinnacles buttes in the northwest Great Divide Basin is examined. The Pinnacles buttes contain an early Eocene mammal assemblage of over 900 cataloged specimens from several prolific University of Michigan localities. The diverse assemblage is represented by a minimum of 56 species of 30 families. Sedimentology of the Main Body of the Wasatch formation in the basin margin of the Great Divide has not previously been examined. This thesis provides the first detailed descriptions and measurements of these specimens and explores the sedimentological and taphonomical environments in which this diverse assemblage accumulated in. The microvertebrate fossils were collected from chute-modified channel bar deposits at two fossiliforous horizons in the uppermost 40-50 m of the Main Body of the Wasatch Formation. Concentration of fossils to discrete horizons vertically associated with crevasse splays and gravel bed streams suggests that proximal channel facies played a pivotal role in preservation of fossils in this setting.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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