Abstract
GIRDLER has presented palaeomagnetic evidence for a clockwise rotation of Africa in the Tertiary1. Such a rotation may have occurred, but it cannot be deduced from the results he used. He gives nine sets of palaeomagnetic results from the Tertiary of Africa and shows that eight of them exhibit clockwise rotations of between 0° and 16°. The conclusion that Africa itself has suffered a clockwise rotation cannot, however, be drawn until the errors and uncertainties associated with each determination are known.
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References
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BROCK, A. Drifting and Rifting: A Comment on the Tertiary Rotation of Africa. Nature 219, 599–600 (1968). https://doi.org/10.1038/219599b0
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DOI: https://doi.org/10.1038/219599b0
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