Graduation Year


Date of Thesis Acceptance

Spring 5-11-2016

Major Department or Program



Grant Shimer


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 (sedimentationaccommodation). 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.

Page Count


Subject Headings

Petrology-- Alaska– North Slope, Facies (Geology), Alaska-- North Slope-- Nanushuk Formation, Geology, Stratigraphic –Cretaceous, Whitman College -- Dissertation collection 2016 – – Geology Department

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Document Type

Whitman Community Accessible Thesis

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