Graphs can be constructed to show the change in magnetic declination and inclination with time by compiling the values of the natural remanent magnetic directions determined from oriented samples taken along the length of cores of the late-glacial and postglacial lacustrine sequence of Thunder Bay. The change in the magnetic declination and inclination values reflects secular variations of the earth's geomagnetic field. The pattern of oscillatory swings of the paleo-declination and paleo-inclination graphs should provide a useful method of time-parallel correlation from core to core. The utilization of the paleo-declination graph supplemented by the paleo-inclination graph does appear to provide a valid method of time-parallel correlation not only across Thunder Bay but possibly for the Great Lakes area.

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