*** Welcome to piglix ***

Chungo Member

Alberta Group
Stratigraphic range: Albian to Campanian
Type Geological formation
Sub-units Wapiabi Formation, Chungo Member, Cardium Formation, Blackstone Formation, Jumping Pound Member
Underlies Belly River Formation
Overlies Blairmore Group, Luscar Group, Crowsnest Formation
Thickness up to 1,219 feet (370 m)
Lithology
Primary Shale, sandstone
Other Siltstone, siderite, limestone
Location
Region  Alberta
Country  Canada
Type section
Named for Alberta
Named by G.S. Hume, 1930

The Alberta Group is a stratigraphical unit of Cretaceous age in the Western Canadian Sedimentary Basin.

It takes the name from the province of Alberta, and was first described in outcrops along the Highwood River in southern Alberta by G.S. Hume in 1930.

The Alberta Group is composed of silty shale for the most part. Two thick shale deposits (Blackstone Formation and Wapiabi Formation) are present above and below a sandstone sequence (the Cardium Formation). Sideritic concretions and thin argillaceous limestone beds are present within the shale stacks.

Gas is produced from the Cardium Formation in Yellowhead County.

The Alberta Group occurs along the Canadian Rockies foothills from the United States-Canada border to the Athabasca River. In its type locality along the Highwood River in Southern Alberta, the group has a thickness of 610 feet (190 m). It reaches a maximum of 1,219 feet (370 m) north of the North Saskatchewan River.

The Alberta Group is conformably overlain by the Belly River Formation and rests unconformably on deposits of the Blairmore Group and Luscar Group in the Canadian Rockies foothills and on the volcanic Crowsnest Formation in southern Alberta's west. The group is equivalent with the Colorado Group and Lea Park Formation in southern Alberta's prairies, and with the Smoky Group in northern Alberta and north-east British Columbia.


...
Wikipedia

...