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Magnetic dating

Now that you have made some observations about the sedimentary features in the core, it's time to determine the age of the sediments and establish a timeline for the core section.

The last full magnetic reversal occurred approximately 780,000 years ago, and it's known as the Brunhes-Matuyama magnetic field reversal.

This means that a compass on Earth (like iron-bearing minerals in sediments!

has a wealth of advanced lab equipment on board, including a cryogenic magnetometer (shown above) that measures the orientation of magnetic mineral grains in rocks.

Methods and techniques differ according to the age and the time resolution needed.

Only 13 specimens, corresponding to well-defined single component behaviour, gave reliable results.

New mean archaeointensities have been obtained for two of the four studied structures (VBK1, 64.2 ± 5.0 µT and VBT1, 62.4 ± 2.6 µT).

Seals representing the rulers of the day were stamped into the handles of Judean pots for centuries, allowing us to date their making very accurately.