Abstract

The late Wisconsin Leaside till and the early Wisconsin Sunnybrook till found near Toronto, Ontario, were examined to determine their paleomagnetic characteristics. More than 300 specimens were tested; they showed that both tills retain a stable primary remanent magnetization of detrital origin (DRM) after alternating field demagnetization. The site mean remanence directions give pole positions of lat 72.6° N., long 167.7° W. (8.5°, 11.1°) for the Leaside till and of lat 71.8° N., long 83.8° E. (8.6°, 13.7°) for the Sunnybrook till. These two remanence direction populations are statistically distinguishable with more than 99 percent confidence. Tills can be characterized by their virtual geomagnetic pole positions.

The location of the Leaside till pole provides field evidence to suggest that the DRM of glacial tills is not subject to inclination errors. Anisotropies of magnetic susceptibility indicate that the Leaside till was deposited from southwesterly flowing ice, and the Sunnybrook till, from northwesterly flowing ice.

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