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Fog Lake, Baffin Island, Canada
Reference
Joynt III, E.H. and Wolfe, A.P. 2001. Paleoenvironmental inference models from sediment diatom assemblages in Baffin Island lakes (Nunavut, Canada) and reconstruction of summer water temperature. Canadian Journal of Fisheries and Aquatic Sciences 58: 1222-1243.

Description
Based on 69 fossil diatom assemblages that were identified and quantified in a sediment core obtained from Baffin Island's Fog Lake (67°11'N, 63°15'W), Joynt and Wolfe derived a nearly 5,000-year record of summer lake water temperature, which displayed a two-stage Medieval Warm Period stretching from approximately AD 950-1200, the peak temperature of which was about 0.5°C less than the peak temperature of the Current Warm Period. This temperature history was derived from a predictive model based on similar data obtained from a total of 61 lakes scattered across Baffin Island.