Origin and magnetic fabric of glacial varves, Nottawasaga River, Ontario, Canada

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Abstract
An examination of the glacial varved clays that crop out in the banks of the Nottawasaga River, Ontario, shows that both the silt and clay layers are composed of sublaminae.An analysis of the magnetic fabric and remanent magnetization of the varves shows that the current directions are the same for the clay and silt layers and that the magnetic fabric in the clay layer was not influenced by the Earth's magnetic field. This indicates that bottom currents were active during the winter period and were of sufficient strength to align the particles of magnetite parallel to the current directions. This conclusion is not unique to the Nottawasaga varves but serves to illustrate that the conceptual model of glacial varve deposition requires modification.

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