Geology Commons^™

Sedimentology And Stratigraphy Of The Upper Cretaceous Puskwaskau Formation In North-Central Alberta, Western Canada Foreland Basin, Omar Al-Mufti

Electronic Thesis and Dissertation Repository

The Santonian to early Campanian mudstone-dominated Puskwaskau Formation was correlated throughout a study area of 50,000 km² in north-central Alberta using 988 well logs. Fourteen informal allomembers, established by previous studies, are bounded by regionally-mappable marine flooding and/or transgressive surfaces that are traceable for hundreds of kilometres within the study area. These laterally continuous bounding surfaces are parallel to very gently converging, and mostly terminate by onlap onto underlying surfaces. Observations in thin section and in SEM revealed ten mudstone microfacies, grouped into five microfacies associations. The facies preserve evidence for repeated storm-generated reworking of the seafloor. The Puskwaskau …

Allostratigraphy, Sedimentology And Paleogeography Of The Cretaceous Upper Fort St. John Group (Upper Albian-Lower Cenomanian) In Northeastern British Columbia, Piotr Jan Angiel

Electronic Thesis and Dissertation Repository

The upper Albian to lower Cenomanian succession in northeastern British Columbia was deposited in the proximal foredeep and is greatly vertically expanded relative to the more eastern part of the basin. The study interval has a wedge-shaped geometry, and is ~780 m thick in the west and thins dramatically to ~280 metres over a distance of ~170 km. Rapid facies changes result in lithostratigraphic units being strongly diachronous. In order to determine depositional history, the present study subdivided the Upper Fort St. John Group into 16 genetically-related allomembers. The new allostratigraphic correlations established in this thesis combined with previous studies, …

Sedimentology And Allostratigraphy Of The Cardium Formation (Turonian-Coniacian) In Southern Alberta, And Equivalent Strata In Northern Montana, Joel Shank

Electronic Thesis and Dissertation Repository

The Turonian-Coniacian Cardium Formation of southern Alberta consists of marine sandstone and mudstone, deposited in a foreland basin over ~2.3 m.y. The formation thins from 150 m in the western foredeep to 50 m 350 km to the east. Correlation of 10 regional flooding surfaces in >1200 well logs and 25 outcrops provides an allostratigraphic framework. Mapping of two previously-unrecognized erosion surfaces (E5.2 and E5.5) reveals additional complexity within sandstone of the Raven River Member.

Facies successions coarsen upwards from thinly-bedded and bioturbated mudstone, to heterolithic facies (either bioturbated or bedded), to clean sandstone. Where conglomerate unconformably overlies this succession, …