“…For decades, researchers in Europe and North America have used transects of sediment cores collected from the margins of small lakes (b 50 ha) to reconstruct past shoreline positions and water-level changes (e.g., Digerfeldt, 1972;Winkler et al, 1986;Almquist-Jacobson, 1995;Abbott et al, 2000;Hubeny et al, 2015). The approach has been applied recently to multiple lakes throughout the semi-arid Rocky Mountain region (Shuman et al, 2009a(Shuman et al, , 2010(Shuman et al, , 2014Shinker et al, 2010;Minckley et al, 2012;Pribyl and Shuman, 2014), and depends upon the observation that as water levels change over time the depositional boundary between near-shore (littoral) sands and deep-water (profundal) muds also moves (Lundqvist, 1925;Digerfeldt, 1986;Rowan et al, 1992;Shuman, 2003).…”