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Paleomagnetic data for basaltic intrusions in the central Falcón Basin document a secondary magnetization associated with alteration during Miocene time. The rocks are extensively altered; however, most of this alteration probably accompanied cooling soon after intrusion. Comparing these secondary magnetic signatures to those of other Cenozoic sites in South America, we conclude that magnetization occurred before the late Miocene folding in the basin and soon after intrusion.

A later stable partial overprinting of this secondary magnetization occurred in which the present geomagnetic field was superimposed on the stable Miocene remanence. At many sites it is difficult to remove this overprinting during demagnetization. The resultant magnetic signature has a steep positive inclination, which in the past has been difficult to interpret.

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