Workers excavating a dry dock in Buenos Aires (Argentina) in 1896 found a human skull, allegedly in a Pre-Ensenadan stratum, a deposit dated one to one and a half million years old, eleven metres below the level of the Rio de la Plata. The Argentine palaeontologist Florentino Ameghino (1854-1911) gave it the scientific name Diprothomo platensis; however, re-examination by the American anthropologist Aleš Hrdlička (1869-1943) a short time later found the cranial capacity to be within the range of modern Homo sapiens and he rejected the new species. There are two problems with the discovery if we follow the conventional view: anatomically modern humans did not exist a million years ago and there were no humans in the Americas before about 35,000 years ago (to accept a controversially early date for their arrival in the western hemisphere).
As with Reck’s skull in Tanzania, there is no indication that the skull fragment was actually embedded in an undisturbed geological deposit. Moreover, I have been unable to find out anything about the skull beyond what appears on creationist websites and in Forbidden Archeology. Presumably, it has been consigned to the dustbin of history, where it remains an exhibit to the errors of previous generations of palaeoanthropologists.