However, geological investigations supported by geochronological analyses indicate that these rocks are much older. He is mostly known for his geochronological work in Patagonia. Paleomagnetic and geochronological dating mechanisms have allowed the deciphering of Precambrian Supereon tectonics. Data from the geochronological analysis of amino acid racemization has been building for thirty-five years. To figure out the age of the metamorphic events, geochronological techniques are used. In 1924, the Geochronological Institute, a special laboratory dedicated to varve research was established.