Paleomagnetic results from three Lower Ordovician units in northwest Argentina are reported. When assessed with available geologic evidence, these data permit the definition of the Puna Oriental–Famatina rotated terrane. Paleogeographic reconstructions based on these paleomagnetic results place Puna Oriental–Famatina in the South Iapetus ocean, close to the Gondwana margin and near some of the Lower-Middle Ordovician Central Mobile belt terranes of the Northern Appalachians. The accretion of Puna Oriental–Famatina may have resulted from the closure of this ocean in Middle Ordovician time.

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