sentences:  Core samples from the nearby Lake Tamarindito indicate that the Petexbatún region was first settled between 2000 and 1000 BC, in the Middle Preclassic.Tamarindito was a small centre in the Early Classic, even after it underwent a significant increase in population at that time.The Early Classic dynasty at Tamarindito claimed that its royal lineage extended back into the Preclassic.