Darrell G. Herd, Charles W. Naeser; Radiometric Evidence for Pre-Wisconsin Glaciation in the Northern Andes. Geology ; 2 (12): 603–604. doi: https://doi.org/10.1130/0091-7613(1974)2<603:REFPGI>2.0.CO;2
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Evidence for pre-Wisconsin glaciation was found on Nevado del Ruiz in the Cordillera Central of Colombia. A lateral moraine is older than a volcanic ash fission-track dated at about 100,000 yr B.P.
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