Two sediment cores from Crawford Lake, west of Lake Ontario. At left, age scale in radiocarbon years and depth in centimeters. Center, oxygen-isotope ratios of lakebed carbonate. To the right, spruce (Picea) and pine (Pinus) pollen abundance. Far right, pollen assemblage zones (PAZ) and inferred vegetation types.
Source: Zicheng Yu and Ulrich Eicher, "Abrupt Climate Oscillations During the Last Deglaciation in Central North America," Science Vol. 282 (Dec. 18, 1998), pp. 2235-2238.
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Last modified by pib on October 28, 2003.