Abstract
AN in situ layer of ignimbrite overlies till near the base of a thick sequence of glacial and fluvioglacial sediments at La Paz, Bolivia. Two radiogenic age determinantions on the ignimbrite gave results of 3.27±0.14 and 3.28±0.13 Myr. We show here that this indicates that climatic cooling in the Southern Hemisphere was sufficiently severe to produce a mountain ice cap over part of the tropical Andes before 3.27 Myr and that these mountains had probably become tectonically elevated to about their present altitude by that time.
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CLAPPERTON, C. Glaciation in Bolivia before 3.27 Myr. Nature 277, 375–377 (1979). https://doi.org/10.1038/277375a0
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DOI: https://doi.org/10.1038/277375a0
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