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Title: The stratigraphy and sedimentology of the Bow Island Formation, South-west Alberta
Author: Cox, John
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1993
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Sediment of the Upper Albian Bow Island Formation in the subsurface of south-west Alberta were deposited in a foreland basin setting proximal to the western margin of the Cretaceous Western Interior Seaway. The formation can be divided into three lithostratigraphic units based on wireline log and core data. The 'Lower' Bow Island Formation, which directly overlies Mannville Group sediments, is composed of numerous stacked, upward-coarsening, shelf-shoreface successions and ranges in thickness from 130 to 420 feet. The 'Middle' Bow Island Formation comprises 20 to 300 feet of coastal-plain sediments which are laterally equivalent to, and also overlie, the 'Lower' Bow Island Formation. 'Upper' Bow Island sediments range up to 102 feet in thickness. They are composed of marginal-marine deposits with occasional thick sandstone/conglomerate development. Facies analysis allows the formation to be divided into three facies associations corresponding to the three stratigraphic divisions. The Shelf-Shoreface Facies Association comprises the 'Lower' Bow Island Formation. Upward-coarsening successions consist of mudstones, sandy mudstones, muddy sandstones and variably-bedded sandstones with occasional bentonite beds. Such deposits are typical of a progradational, wave-dominated, shelf-shoreface setting. The Coastal-Plain Facies Association comprises the 'Middle' Bow Island Formation. Vari-coloured mudstones were laid down in a coastal floodplain environment and commonly exhibit pedogenic alteration. The mudstones are cut by sharp-based sandstones deposited in meandering fluvial channels and crevasse-splay environments. The Transgressive Facies Association comprises the 'Upper' Bow Island Formation and is sub-divided into three Complexes: the Estuarine Channel Complex; the Embayment Complex and the Shelf-Shoreface Complex.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available