They are shallowly engraved with a variety of images, some directly incised, others by removing the background, leaving the image in relief. The images vary from simple pictures on one side of a pebble, up to designs of great complexity. Some of the designs are in styles which can be recognized as belonging to the Paracas, Nazca, Tiwanaku, Ica or Inca cultures.[1]
Some of the images are of flowers, fish, or living animals of various sorts.[1] Others appear to depict scenes[2][3] which would be anachronistic in pre-Columbian art, such as dinosaurs, advanced medical works and maps.