The Cretaceous terrestrial strata of the Neuquén Basin (northern Patagonia, Argentina) are described together with their tetrapod records. Six local tetrapod assemblages are identified: Amargan (Barremian-Early Aptian), Lohancuran (Late Aptian-Albian), Limayan (Cenomanian-Early Turonian), Neuquenian (Late Turonian-Coniacian), Coloradoan (Santonian-Early Campanian) and Allenian [Late Campanian-Early Maastrichtian (= Alamitense = Alamitian SALMA)]. The last of these includes records from north-eastern Patagonia.