Abstract

The Port Stanley till, located along the north shore of Lake Erie, was sampled in detail at vertical intervals of 25 cm at one site near Wheatley, Ontario (19 blocks, 90 specimens), and at six other sites (39 blocks, 235 specimens) along 100 km of the shore of Lake Erie east of Wheatley to the Port Stanley area. The detrital remanent magnetization (DRM) is moderately intense (mean JNRM ≈ 4.1 × 10−5 emu per cm3) and stable (mean coercivity ≈300 Oe). The DRM mean directions after alternating-field (AF) demagnetization for each site are well grouped (mean α95 = 8.6°), indicating a mean direction by sites of 7.4°, 47.2° (R = 6.9830, α95 = 3.2°) and a mean virtual geomagnetic pole (VGP) position of lat 74.7° N., long 78.2° E. (δm = 4.2°, δp = 2.7°). The paleomagnetic data suggest a rapid deposition rate for the Port Stanley till of 100 to 400 yr, in reasonable agreement with the minimum geologic estimate of about 500 yr. Anisotropy of magnetic susceptibility measurements made at each site provides a reliable estimate of the fabric in the till.

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