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    A chronostratigraphic framework for the Upper Jurassic Morrison Formation, western U.S.A.

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    Maidment&Muxworthy_Preprint.pdf
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    Authors
    Maidment, Susannah cc
    Muxworthy, A
    Issue date
    2019-10-29
    Submitted date
    2020-04-16
    Subject Terms
    Morrison Formation
    Tetrapoda
    Archosauria
    Reptilia
    Western Interior
    sedimentary rocks
    Western U.S.
    Jurassic
    Chordata
    Upper Jurassic
    upper Kimmeridgian
    Vertebrata
    clastic rocks
    paleoecology
    Diapsida
    Kimmeridgian
    Mesozoic
    North America
    paleoclimatology
    United States
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    Abstract
    The fluvial, overbank, and lacustrine deposits of the Upper Jurassic Morrison Formation of the Western Interior, U.S.A. have been intensively studied due to their diverse and well-preserved dinosaurian fauna, and the presence of economic quantities of uranium and vanadium ores. The formation crops out over 12 degrees of latitude and 1.2 million km2, and is an excellent case study for the examination of paleoecology, community structure, and evolutionary dynamics at a time in Earth's history when the climate was significantly warmer than today. However, paleoecological studies have been hampered by lack of correlation across the formation. Assuming a primarily tectonic control on fluvial architecture, we propose the first chronostratigraphic framework of the formation, which is based on sequence stratigraphy, magnetostratigraphy, and radiometric dating. The formation can be divided into three sequences each represented by a period of degradation followed by aggradation. This chronostratigraphic framework indicates that the formation youngs to the north, and was deposited over about 7 million years during the late Kimmeridgian and Tithonian. This framework provides a foundation for future sedimentological, stratigraphic, and paleobiological studies of the iconic dinosaurian fauna known from the Morrison.
    Citation
    Susannah C.R. Maidment, Adrian Muxworthy; A chronostratigraphic framework for the Upper Jurassic Morrison Formation, western U.S.A.. Journal of Sedimentary Research ; 89 (10): 1017–1038. doi: https://doi.org/10.2110/jsr.2019.54
    Publisher
    Society for Sedimentary Geology
    Journal
    Journal of Sedimentary Research
    URI
    http://hdl.handle.net/10141/622707
    DOI
    10.2110/jsr.2019.54
    Type
    Journal Article
    Item Description
    The attached document is the authors’ final accepted/submitted version of the journal article. You are advised to consult the publisher’s version if you wish to cite from it.
    ISSN
    1527-1404
    ae974a485f413a2113503eed53cd6c53
    10.2110/jsr.2019.54
    Scopus Count
    Collections
    Earth sciences

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