The Yorktown unconformably overlies the Miocene Eastover Formation, and conformably underlies the Pliocene Croatan Formation. It conformably overlies the Akaiwa Formation and is unconformably overlain by the Omichidani Formation. It conformably overlies the Cadomin Formation and is disconformably overlain by the Bluesky Formation. The Karadon Formation conformably overlies the Kozlu. These are conformably overlain by peperite and the basaltic and andesitic Lorne plateau lavas. The Judith River Formation conformably overlies the Claggett Formation and Pakowki Formation. It is conformably overlain by the Grand Rapids Formation and conformably overlies the McMurray Formation. It rests conformably on the Fox Hills Sandstone and unconformably underlies the Arapahoe Conglomerate. It is conformably overlain by the Wapiabi Formation and underlain by the Blackstone Formation. The Gravelbourg Formation is conformably overlain by the Shaunavon Formation. The formation is in Ontario conformably overlain by the Middle Devonian Bois Blanc Formation. It rests unconformably above the Martinsburg Formation and conformably below the Bloomsburg Formation. The McMurray Formation is conformably overlain by the Wabiskaw Member of the Clearwater Formation. It follows conformably after the Ecca Group and unconformably underlies the Stormberg Group. Conformably overlaying the Alacaagzi Formation is the Kozlu Formation.