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.
Uschuya, after claiming them to be real ancient artifacts, admitted to creating the carvings he had sold and said he produced a patina by baking the stone in cow dung.
As a result of weathering, they have developed a thin patina.
The Ica stones are a collection of andesite stones found in Ica Province, Peru that bear a variety of diagrams.
Some of them supposedly have depictions of dinosaurs, and what is alleged to be advanced technology.
Cabrera published a book, The Message of the Engraved Stones of Ica on the subject, discussing his theories of the origins and meaning of the stones.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 a fairly flat and irregular in shape, approximately 7 x 6 x 2 cm in size.On it was carved a design which might be abstract, or could be taken as a flower with eight petals. In the San Evaristo cemetery in Toma Luz, he found a carved stone of similar size to the previous one, with a realistic image of a fish.The context dated the tomb to the Middle Horizon (600-1000 A. In a grave not far away in the same cemetery, he found a stone with the fairly realistic design of a llama, in a context typical of the Ica culture.