Conversely, the uppermost of these moraines is about 16,000 - 14,000 years old and correlates to a glacial advance in the Altiplano that has been correlated to the maximum growth of the former Lake Tauca north of Uturuncu and a wet and cold climate associated with Heinrich event 1. At this same time 17,000 - 13,000 years ago, shorelines formed around the lakes that surround Uturuncu; Lake Tauca may have been a source of moisture for Uturuncu. After 14,000 the glacier receded at the same time as climate warmed during the Bolling-Allerod warming and the region became drier.