. It is inferred that at first some summers were warm enough to permit thermal stratification of the kettle lake, but later cooler and perhaps windier summers prevailed. The most extreme conditions of the stadial, represented by the Artemisia maximum, were marked
by a probable reduction in snow-beds, a decrease in the rate of sedimentation and in the size of mineral particles, and a fine lamination of sediment which suggests cold monomictic conditions in the lake. Oceanic conditions returned to the kettle site towards