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Palaeomagnetic and radiometric data of seven igneous units from Trindade Island are given. They support the age of 2.41 ± 0.05 m.y. for the polarity transition between the Matuyama reversed and the Gauss normal epochs. On the basis of the mean direction of cleaned remanent magnetization of each igneous unit a virtual geomagnetic pole is computed; the mean of these virtual geomagnetic poles is 86°S, 5°E, α 95 = 4; it would represent the Late Cenozoic palaeomagnetic pole for the Trindade Island. It is suggested that the normal polarity found in igneous rocks from Argentina would represent a continental evidence for the existence of the short normal polarity event at the beginning of the Matuyama reversed epoch suggested on the basis of seafloor spreading data.

PALAEOMAGNETISM AND K/AR AGES OF SOME IGNEOUS ROCKS OF THE TRINDADE COMPLEX AND THE VALADO FORMATION, FROM TRINDADE ISLAND, BRAZIL