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The thermal demagnetizer was used for several samples (including sediment J-cubes and a hard rock cube and cylinder). The sediment cubes were given a 1000 mT IRM before the thermal demagnetization. Sediment J-cubes were heated up to 125°C safely then removed from their plastic cubes and the remainder of the heating was done out of the plastic cube. Sediment and hard rock samples were heated from 100°C up to 600°C generally in 50°C increments. After each heating cycle, the samples were measured in the SRM; the hard rock samples were measured with the JR-6 as well for comparison.
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