 Before the former casino building was completed , in 1908 , Agustín Ross Edwards and Evaristo Merino reported to historiographer José Toribio Medina the existence of indigenous remains in the cave now called the Gruta de la Virgen . Medina asked Argentinean ethnographer Félix Faustino <unk> to inspect the remains , and subsequently Medina wrote the book Los <unk> Indígenas de Pichilemu ( The Indigenous Remains of Pichilemu ) , using the report Faustino <unk> gave him . 
