A magnetostratigraphic study of upper Mesozoic limestone sections in northeastern Tunisia combined with a study of existing radiometric data leads to a slight modification in the correlation of the marine magnetic anomaly sequence with the biostratigraphic scale. The base of the Keathley sequence (M25) lies in the upper Oxfordian with M22 being within the lower Kimmeridgian. The upper part of the section studied (uppermost Campanian-Maestrichtian) matches with data from previous studies. There is a tentative suggestion that the Cretaceous quiet interval, from 77 to 112 m.y.B.P., may contain a number of reversals of short duration. The nature of our samples prevents verification of this. The geomagnetic pole position for the Upper Jurassic is 62.0S 15.9E A₉₅ = 7 9.

The ammonitico rosso sections suggest correlation which implies that although reduced in thickness there are no major lacunae in the sections.

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