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Paleomagnetism is a branch of geophysics that uses remanent magnetization in rocks from the time of their formation to reconstruct the direction and/or strength of the geomagnetic field.

Kirschvink specializes in measuring remanent magnetic fields in rock, which can indicate the latitude at which the rock formed, millions or billions of years ago, and can trace its tectonic wanderings.

Typically, magnets are used to sift for zircons, which contain magnetizable minerals such as magnetite—but that would have altered any remanent field in the zircons.

De quibus subtracta tertia parte pro campo jacente ad warectum, 64 sol. scilicet, remanent ad extentam annuam de puro 6 librae 8 sol. et de commodo terrae quae singulis annis potest inhokari 15 sol.

Majesty's mind so inclined to mercy, that, within short space thereafter, I was permitted to repair into Scotland, to deal with Earls Murray, Atholl, Bothwell, Argyll, and Secretary Lethington, in the name and behalf of the said Earl Morton, Lords Ruthven, Lindsay, and remanent accomplices....