Description
Working with stable carbon isotope data obtained from α-cellulose isolated from the stems of Sphagnum fuscum moss contained within peat profiles obtained near Selwyn Lake (~59°53'N, 104°12'W) in the Canadian subarctic, with temperatures inferred from a linear model equation derived from δ¹³C values of the uppermost 10 cm of moss and corresponding July temperatures measured nearby over the period 1987-2004, Tillman et al. determined that "between c. 1300 and 900 cal yr BP, corresponding to a period of Mediaeval warmth, temperatures of a level similar to that experienced in the late 20th century appear to have prevailed."