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The end of the Early Cretaceous sag stage along the Southern Patagonian Andes is indicated by the sudden appearance of shallow marine to deltaic sandstones on top of deep marine facies. We studied the detrital and volcanic zircon U–Pb geochronology from the coarse-grained deposits represented by the Río Belgrano and Río Tarde formations at the northern end of the Austral or Magallanes basin. The maximum...
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