A report on Belly River Group

Belly River beds exposed along the Oldman River

Stratigraphical unit of Late Cretaceous age in the Western Canadian Sedimentary Basin.

- Belly River Group
Belly River beds exposed along the Oldman River

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Overall

Lea Park Formation

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Stratigraphical unit of Late Cretaceous age in the Western Canadian Sedimentary Basin, Canada.

Stratigraphical unit of Late Cretaceous age in the Western Canadian Sedimentary Basin, Canada.

It is equivalent to Judith River Formation, Clagett Formation and Eagle Formation in northern Montana, and is replaced by the Belly River Formation, Pakowki Formation and Milk River Formation in southern Alberta.

"Leonardo," a rare intact mummified Brachylophosaurus canadensis uncovered in the Judith River Formation.

Judith River Formation

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Fossil-bearing geologic formation in Montana, and is part of the Judith River Group.

Fossil-bearing geologic formation in Montana, and is part of the Judith River Group.

"Leonardo," a rare intact mummified Brachylophosaurus canadensis uncovered in the Judith River Formation.
"Leonardo," a rare intact mummified Brachylophosaurus canadensis uncovered in the Judith River Formation.

It is equivalent to the Belly River Formation in the southern Canadian Rockies foothills, the Lea Park Formation in central Alberta and the Wapiti Formation in the northwestern plains.

Contact (red arrow) between the underlying marine shales of the Bearpaw Formation and the coastal Horseshoe Canyon Formation.

Bearpaw Formation

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Geologic formation of Late Cretaceous age.

Geologic formation of Late Cretaceous age.

Contact (red arrow) between the underlying marine shales of the Bearpaw Formation and the coastal Horseshoe Canyon Formation.
Bearpaw shale being excavated to recover ammonites for ammolite production.
A specimen of Placenticeras ammolite from the Bearpaw Formation.

The Bearpaw Formation conformably overlies the Dinosaur Park Formation of the Belly River Group in central Alberta, and the Judith River Formation in the plains to the east and Montana.

Alberta Group

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Stratigraphical unit of Cenomanian to early Campanian age in the Lewis overthrust in the Western Canadian Sedimentary Basin.

Stratigraphical unit of Cenomanian to early Campanian age in the Lewis overthrust in the Western Canadian Sedimentary Basin.

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.

Belly River

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River in northwest Montana, United States and southern Alberta, Canada.

River in northwest Montana, United States and southern Alberta, Canada.

The river gives the name to the Cretaceous age Belly River Formation, which was observed on its banks by George Mercer Dawson in 1883.

Outcrops of the Foremost Formation (basal sandstone and MacKay coal zone) along the Milk River at Writing-On-Stone Provincial Park

Foremost Formation

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Stratigraphic unit of Late Cretaceous age that underlies much of southern Alberta, Canada.

Stratigraphic unit of Late Cretaceous age that underlies much of southern Alberta, Canada.

Outcrops of the Foremost Formation (basal sandstone and MacKay coal zone) along the Milk River at Writing-On-Stone Provincial Park
The basal sandstone of the Foremost Formation beside the Milk River at Writing-On-Stone Provincial Park

The Foremost Formation is the basal unit of the Belly River Group (called the Judith River Group in the United States).

Dinosaurs of the Oldman Formation

Oldman Formation

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Stratigraphic unit of Late Cretaceous age that underlies much of southern Alberta, Canada.

Stratigraphic unit of Late Cretaceous age that underlies much of southern Alberta, Canada.

Dinosaurs of the Oldman Formation

The Oldman Formation is a member of the Belly River Group (also known as the Judith River Group).