Crawford Lake


Crawford Lake is a small (2.5 ha) lake located in Ontario, Canada. Core samples were taken from the lake sediments in order to study its fossil plankton abundance and geochemical characteristics during the last thousand years (Ekdahl et al. 2004). Pre-European contact Zea pollen was recovered from core depths between about 40 and 60 cm below the lake bottom. Nine AMS radiocarbon samples on organic materials from this segment of the core showed that it dated between A.D.1268 and 1486 (Ekdahl et al. 2004:Figure 2). Here we include only the two earliest dates on a leaf sample associated with the earliest maize pollen.

ID Other ID Type Subtype Uncal BP (years) ± 1 σ (years) Median cal BP (years) Lower cal BP (years) Upper cal BP (years) δ13C Contaminated?
CAMS-94414 MicroSample pollen 720 40 672 730 564 No
CAMS-94413 MicroSample pollen 705 40 663 724 561 No

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References Cited

Ekdahl, Erik J., Jane L. Teranes, Thomas P. Guilderson, Charles L. Turton, John H. McAndrews, Chad A. Wittkop and Eugene F. Stoermer
    2004    Prehistorical Record of Cultural Eutrophication from Crawford Lake, Canada. Geology 32(9):745-748.