Glaciation in Southern Argentina More than Two Million Years Ago

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Science  16 May 1969:
Vol. 164, Issue 3881, pp. 823-825
DOI: 10.1126/science.164.3881.823


In southern Argentina till beds interbedded with lava flows were deposited by ice that extended at least 40 kilometers east of the present crest of the cordillera. The flow covering the oldest till bed is 3.2 ± 1 million years old. The flow that constitutes the present surface and covers the youngest till bed, is 1.7 ± 0.5 million years old.

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