The Morrissey Formation abruptly but conformably overlies the Passage Beds at the top of the Fernie Formation, and is in turn abruptly but conformably overlain by the Mist Mountain Formation. To the north in the vicinity of the North Saskatchewan River it interfingers with and grades into the Nikanassin Formation. To the east it was truncated by pre-Aptian erosion and is unconformably overlain by the Cadomin Formation. Its correlation south of the Canada-United States border in Montana is uncertain.