Master of Science
In the Cenomanian-Turonian Dunvegan and Kaskapau formations in Alberta and British Columbia, terrestrial, and nearshore to offshore environments can be related temporally and spatially using a well-established allostratigraphic framework. In these varied environments, ten mudstone microfacies were identified, using optical and scanning electron microscopy. Microfacies 1 through 3 were deposited in a freshwater lacustrine environment by hyperpycnal flows, and consist of rippled, structureless, and inverse-to-normally graded thin beds that record turbulent, laminar, and waxing and waning flow. Microfacies 4 and 5 were deposited from turbulent flow in a fluvial environment. Microfacies 6 represents a paleosol that underlies a maximum flooding surface above the base of Dunvegan allomember E. Marine prodelta mudstones contain microfacies 7 to 9 that comprise bioturbated mudstone characterised by a randomly oriented clay fabric, and storm-generated interlaminated siltstone and mudstone. Microfacies 10 is the most distal offshore facies and includes organo-mineralic aggregates and re-worked intraclastic aggregates.
Summary for Lay Audience
The intricacies of mudstone microstructure are examined at a micron-scale using detailed scanning electron microscopy of ancient mudstones sampled from the Cenomanian-Turonian Dunvegan and Kaskapau formations in Alberta and British Columbia.
Pavan, Katharin, "Microfacies analysis of mudstone in a freshwater to marine transect: Upper Cretaceous Dunvegan and Kaskapau formations, Western Canada Foreland Basin" (2019). Electronic Thesis and Dissertation Repository. 6528.
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