Bird footprints from the Anacleto Formation (Late Cretaceous), Neuquén, Argentina

摘要: Bird footprints recovered from the Anacleto Formation (Campanian, Upper Cretaceous) at Sierra Barrosa, northeast of Plaza Huincul, Neuquen Province, represent earliest record s bird traces Patagonia. All specimens were two sites same stratigraphic level separated by less than a hundred meters. They are tridactylous, c1awed prints with divarications greater 90° between digits II and IV, seem to three different ichnotaxa. The most common avian footprint lacks hallux can be referred Aquatilavipes. A smaller number includes distinct impressions, similar Ignotornis Jindongornipes. third type represents new ichnotaxon, Barrosopus slobodai ichnogen. et ichnosp. nov. characterized size digit impression that is separate conjoined fourth ones. These fossilized tracks first reported Basin, double Cretaceous occurrences in Argentina.