The figurines and the wall reliefs are probably an offshoot of the Caral culture, and they probably portray ancient Caral leaders, including a priestess. The walls are made of adobe. The reliefs show four human heads with their eyes closed, and two snakes wrapped around them. They appear to be humanoid seed symbols digging into the ground and they face  agricultural fields. The reliefs portray soil fertilization and the deity of water.

International Business Times has the story with photos here;http://www.ibtimes.sg/archaeology-3800-year-old-wall-relief-mysterious-structures-discovered-peru-27076