 A pollen record from the Siskiyou Mountains suggests a lag in timing of the Younger Dryas, indicating a greater influence of warmer Pacific conditions on that range, but the pollen record is less chronologically constrained than the aforementioned speleothem record.The Southwest appears to have seen an increase in precipitation, as well, also with an average 2° of cooling.The Younger Dryas is often linked to the Neolithic Revolution, the adoption of agriculture in the Levant.