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It is effective on timescales of several millions of years.
It assumes that boulders have not been buried and then re-exposed at the Earth’s surface.
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Unfortunately, glacial sediments are typically difficult to date.
Most methods rely on indirect methods of dating subglacial tills, such as dating organic remains above and below glacial sediments.
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Cosmogenic nuclide dating is useful for directly dating rocks on the Earth’s surface.
It gives an Exposure Age: that is, how long the rock has been exposed to cosmic radiation.
Unconsolidated sediments contain magnetic minerals, such as those on the continental shelf and slope. The remnant magnetism of the sediment is a reflection of the earth’s palaeomagnetic field at the time of deposition.
The sediments can be compared to palaeo magnetostratigraphic data, and this can be used as a proxy age determination.