The first evidence of human settlers in Guatemala dates back to 12,000 BC. Some evidence suggests human presence as early as 18,000 BC, such as obsidian arrow heads found in various parts of the country.There is archaeological proof that early Guatemalan settlers were hunters and gatherers, but pollen samples from Petén and the Pacific coast indicate that maize cultivation was developed by 3500 BC.Sites dating back to 6500 BC have been found in Quiché in the Highlands and Sipacate, Escuintla on the central Pacific coast.
Archaeologists divided the pre-Columbian history of Mesoamerica into the Preclassic period (2999 BC to 250 BC), the Classic period (250 to 900 AD), and the Postclassic from 900 to 1500 AD.Until recently the Preclassic was regarded as a formative period, with small villages of farmers who lived in huts, and few permanent buildings. However, this notion has been challenged by recent discoveries of monumental architecture from that period, such as an altar in La Blanca, San Marcos, from 1000 BC; ceremonial sites at Miraflores and El Naranjo from 801 BC; the earliest monumental masks; and the Mirador Basin cities of Nakbé, Xulnal, El Tintal, Wakná and El Mirador. /Wikipedia/