Donald R. Sprowl, Subir K. Banerjee; High-resolution paleomagnetic record of geomagnetic field fluctuations from the varved sediments of Elk Lake, Minnesota. Geology ; 13 (8): 531–533. doi: https://doi.org/10.1130/0091-7613(1985)13<531:HPROGF>2.0.CO;2
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Measurements of samples taken from three parallel cores from Elk Lake in northern Minnesota have been combined to produce a high-quality record of recent variations in the local magnetic field. Annual laminations in the sediment provide excellent time control for the record and evidence for a consistent depositional environment. The Elk Lake paleomagnetic record contributes significantly to our understanding of the recent history of the magnetic field in central North America, modifying several previous conclusions.