The southern group belongs to old Chichen and is a complex of buildings located in the jungle, to the south of the group made up by the Observatory and the Nunnery. The buildings of the southern group were constructed between the 7th and the 10th centuries AD and correspond to the Puuc architectural style. The most important are the Temples of the First Series, of the Phalluses, of the Owls and of the Atlases.