Radiometric dating measures

Both are measured as east of North, or in other words as the angular distance from North in a clockwise direction.A standard 1” core specimen is shown (above right) with the ‘z’ axis and direction marked on the side of the specimen.

This orientated reference frame is crucial if we want to determine the direction of the ancient geomagnetic field.

There, Henry awaited us with his treasure – drawers full of samples, floppy drives full of measurement data and an enormous amount of additional knowledge and kindly allowed us to use his samples and data for our projects.

The picture below shows the main part of the lab with the most elegant magnetometer in the centre.

Later on, back at the laboratory, we will carry out palaeointensity analysis on the samples.

The amount of magnetisation trapped in the rock is almost linearly related to the ancient magnetic field strength; because of this relationship, we are able obtain estimates for the strength of the ancient field.

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Below is an image of the sun compass used by the Liverpool Geomagnetism team.

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