The alleged superiority of the petroglyph's male subjects was the basis for the researcher's conclusion that they were created after 1500 BCE, when it is believed that matriarchal societies were replaced by patriarchies.
The researcher concluded that the petroglyphs were made after 1500 BCE because of the alleged superiority of the male subjects depicted in them. This conclusion was based on the belief that matriarchal societies had been replaced by patriarchal ones around that time.