In this he argued that the stones were evidence "that man is at least 405 million years old" and for what he calls "gliptolithic" man, humans from another planet.He said that "Through the transplantation of cognitive codes to highly intelligent primates, the men from outer space created new men on earth." Later, Uschuya recanted the forging story during an interview with a German journalist, saying that he had claimed they were a hoax to avoid imprisonment for selling archaeological artifacts.
Cabrera later found another source of the stones, a farmer named Basilio Uschuya, who sold him thousands more.
In September 1966 in Uhle Hill cemetery, De la Banda sector, Ocucaje District, they found, for the first time, an engraved stone with certain provenance in a tomb of the Paracas culture.
This stone was fairly flat and irregular in shape, approximately 7 cm × 6 cm × 2 cm (2.76 in × 2.36 in × 0.79 in) in size.
One of these collectors was Santiago Agurto Calvo, an architect by profession, who was Rector of the National University of Engineering in Lima.
He organised searches in ancient cemeteries, and in August 1966 found such a stone in the Toma Luz sector, Callango district, in Ica Valley. He reported his discovery to the Regional Museum in Ica city, and was accompanied on further expeditions by its curator, the archaeologist Alejandro Pezzia Assereto.