sentences:  The Early Classic (or Tequila III phase) dates from 100 BCE to 200 CE This period is characterized by the continuing construction of guachimontones and ball courts, like Circles 2 and 3.During this period, the site reached its maximum population estimated between 3,690 to 9,225 people with a mean population of 6,458 based on settlement survey by Heredia Espinoza.Late Classic (or Tequila IV phase) dates from 200 to 450/500 CE During this period, there is a drop in population levels at the site and currently the cause is uncertain.