These pecked-cross circles can be found not just in Teotihuacan, but also throughout Mesoamerica. The ones found all share certain similarities. These include having the shape of two circles, one being inside of the other. They are all found pecked on the ground or onto rocks. They are all created with a small hammer-like device that produces cuplike markings that are 1 centimetre in diameter and 2 centimetres apart. They all have axes that are in line with the city structures of the region. Because they are aligned with the structures of the cities, they also align with the position of significant astronomical bodies.