Anacleto Formation

The Anacleto Formation is a geologic formation with outcrops in the Argentine Patagonian provinces of Mendoza, Río Negro, and Neuquén. It is the youngest formation within the Neuquén Group and belongs to the Río Colorado Subgroup. Formerly that subgroup was treated as a formation, and the Anacleto Formation was known as the Anacleto Member.
The type locality of this formation lies west of the city of Neuquén. At its base, the Anacleto Formation conformably overlies the Bajo de la Carpa Formation, also of the Río Colorado Subgroup, and it is in turn unconformably overlain by the Allen Formation of the younger Malargüe Group.
The Anacleto Formation varies between thick, and consists mainly of claystones and mudstones, purple
and dark red in color, deposited in fluvial, lacustrine and floodplain environments. Geodes are often found scattered throughout this formation.
Fossil content.
Nests of dinosaur eggs, many with preserved embryos inside, have been discovered in large quantities at the famous Auca Mahuevo locality, and have been attributed to titanosaurs.
Known from bones found in the Anacleto Formation are:
The oldest known unequivocal bird footprints from South America were also discovered in the Anacleto Formation. The small footprints were tentatively assigned to the ichnogenus "Aquatilavipes" and might have been produced by "Patagopteryx" (whose fossils were only found in the Bajo de la Carpa Formation however) or some unknown wader-like bird; they lack a hind toe. "Ignotornis" refers to similar footprints made by larger birds with a small hind toe; they might have been left by "Neuquenornis", but this is also only known from the Bajo de la Carpa Formation. Footprints of these two ichnogenera have also been found elsewhere, but it must be understood that assignment to the same ichnogenus does not imply a close relatedness of the organisms that produced these traces, only a similar morphology.
Even smaller and somewhat unusual footprints assigned to "Barrosopus" are only known from the Anacleto Formation. They were almost certainly made by some tiny theropod, but whether this was a bird is not quite clear: the innermost front toes of the animal leaving these tracks attached in a position higher than the others. In that, and in their dimensions, they are a very close match for the odd-footed enantiornithine bird "Yungavolucris brevipedalis", but this is only known from the Maastrichtian Lecho Formation which is some 10 million years younger.