Upper Cretaceous rocks ranging from Cenomian to Campanian reach an aggregate thickness of 7,000 feet or more to the south of the Peace River valley. The sequence is divided, from bottom to top, into the Cruiser, Dunvegan, Kaskapau, Cardium, Wapiabi, Chinook and Wapiti Formations.

Faunal content and lithology indicate a marine, and in part euxenic environment for the Cruiser, a deltaic environment for the Dunvegan, a shallow marine to brackish environment for the Kaskapau, a shallow marine to brackish environment, with evidence of intraformational unconformity for the Cardium, a shallow marine environment for the Wapiabi, a brackish environment for the Chinook and a continental environment for the Wapiti.

The Lower-Upper Cretaceous boundary is located within a band of fish-scale bearing siltstones within the Cruiser Formation.

(1 table, 1 diagram, 20 refs.)

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