Human faces sculpted into stone up to 2,000 years ago have appeared on a rocky outcropping along the Amazon River since water levels dropped to record lows in the region's worst drought in more than a century. Some rock carvings had been sighted before but now there is a greater variety that will help researchers establish their origins, archaeologist Jaime de Santana Oliveira said on Monday. The rocky point is called Ponto das Lajes on the north shore of the Amazon near where the Rio Negro and Solimoes rivers join.