Science. 1982 May 28;216(4549):986-9. doi: 10.1126/science.216.4549.986.
Mammal faunas collected from the Uquía Formation at Chucalezna and Esquina Blanca in Jujuy Province, northwest Argentina, are calibrated by potassium-argon age determinations and paleomagnetic polarity data. The sediments range in age from 2.5 million years old to perhaps as young as 1.5 million years, from late Pliocene through early Pleistocene, and correspond in time to late Blancan and early Irvingtonian land mammal age faunas in North America.
从阿根廷西北部胡胡伊省的楚卡列兹纳和埃斯奎纳布兰卡采集的哺乳动物化石，通过钾-氩年代测定法和古地磁极性数据进行了校准。这些沉积物的年龄范围从 250 万年到 150 万年不等，从上新世晚期到更新世早期，与北美的晚布兰坎和早欧文顿陆地哺乳动物时代的化石群相对应。
