Regional to Subregional Facies Architecture of River-Dominated Deltas in The Alberta Subsurface, Upper Cretaceous Dunvegan Formation

Abstract The Dunvegan Formation (mid-Cenomanian) comprises a thick clastic wedge deposited in the West Alberta foreland basin. This wedge consists of a complex series of interbedded shales, siltstones, and sandstones and has been subdivided into seven allomembers (A-G), each separated by widespread flooding surfaces. Allomember E consists of four offlapping, shingled, heterolithic sedimentary units that progressively built seaward to the …