The Cretaceous is usually broken into Lower, Middle, and Upper subdivisions. The Faunal stages from youngest to oldest are: Maastrichtian/Navarro? (Senonian/Eagle? Ford/Austin?/Gulf?/Upper? Cretaceous) Campanian/Taylor? (Senonian/Eagle? Ford/Austin?/Gulf?/Upper? Cretaceous) Santonian (Senonian/Eagle? Ford/Austin?/Gulf?/Upper? Cretaceous) Coniacian (Senonian/Eagle? Ford/Austin?/Gulf?/Upper? Cretaceous) Turonian (Gallic/Nuevo? Leon/Trinity?/Lower? Cretaceous) Cenomanian/Woodbine? (Gallic/Nuevo? Leon/Trinity?/Lower? Cretaceous) Albian/Frederiksberg? (Gallic/Nuevo? Leon/Trinity?/Lower? Cretaceous) Aptian (Gallic/Nuevo? Leon/Trinity?/Lower? Cretaceous) Barremian (Gallic/Nuevo? Leon/Trinity?/Lower? Cretaceous) Hauterivian (Neocomian/Durango?/Lower? Cretaceous) Valanginian (Neocomian/Durango?/Lower? Cretaceous) Berriasian (Neocomian/Durango?/Lower? Cretaceous) |