The BBC has an article on the release of the first worldwide map of magnetic anomalies, deviations in the earth’s magnetic field due to effects from magnetized crustal rocks. Nice views of the magnetic striping on either side of the Mid-Atlantic Ridge resulting from ocean-floor spreading (the driver of continental drift) and prehistoric reverses in the direction of the earth’s magnetic field:
From the Commission for the Geological Map of the World, which has links to this and other small-scale world geology maps for sale; the BBC article has a link to a free high-resolution PDF map of the magnetic anomaly map.
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