The sedimentary deposits in eroded badlands at Auca Mahuevo in the Patagonian province of Neuquen, Argentina, are among the paleontologist's rare lagerstätten, the undisturbed strata that give glimpses of a range of ecology at a given moment in the Earth's history. The sedimentary layers at Auca Mahuevo were laid down 80 million years before present and offer an unequalled view of a fossilized titanosaurid sauropod hatchery.