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  3. Facies analysis and sedimentology of the Cretaceous Nanushuk Formation at Slope Mountain, Alaska
Title

Facies analysis and sedimentology of the Cretaceous Nanushuk Formation at Slope Mountain, Alaska

    Item Description
    Limited Access
    The author(s) chose to restrict access to this thesis to current Whitman students, faculty, and staff. Please log in to view it.
    Linked Agent
    Creator (cre): Gardner, Kevin K.
    Advisor (adv): Shimer, Grant
    Department (dpt): Whitman College. Geology Department
    Date
    May 11, 2016
    Graduation Year
    2016
    Abstract

    An analysis of sedimentary lithologies and structures in selected outcrop sites at Slope Mountain, Alaska identified thirteen distinct facies within a subsample of the Cretaceous (Albian-Cenomanian) Nanushuk Formation. Based on the distribution of the thirteen facies, this study defines five unique facies associations at Slope Mountain, each representing a specific depositional environment. The facies associations are as follows: 1) distributary channel bar, 2) tidal channel, 3) upper shoreface, 4) distributary mouth bar, and 5) fluvial channel. The relative stratigraphic positions of the facies associations in outcrop have implications for fluctuations in shifting shoreline positions within the Nanushuk Formation over time. The progression of facies associations within several hundred meters of section analyzed in this study depict a shift from a regressive deltaic system (sedimentation>accommodation) to an alluvial system affected by local transgression (sedimentation<accommodation), followed by a return to rapid and potentially forced regression (sedimentation>accommodation). Despite significant overall accommodation in the Colville basin, the dominant pattern of Nanushuk Formation sedimentation is highly regressive, with significant progradation and aggradation of deltaic and alluvial deposits throughout the Albian-Cenomanian.

    Subject
    Alaska -- Colville Basin
    Alaska -- North Slope -- Slope Mountain
    Petrology -- Alaska -- North Slope
    Facies (Geology) -- Alaska -- North Slope -- Nanushuk Formation
    Sedimentation and deposition
    Geology, Stratigraphic -- Cretaceous
    Science
    Academic theses
    Whitman College 2016 -- Dissertation collection -- Geology Department
    Geographic Subject
    United States
    Alaska
    Genre
    Theses
    Extent
    56 pages
    Permanent URL
    http://works.whitman.edu/201608091304
    Rights
    http://rightsstatements.org/vocab/InC/1.0/
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