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Here is another self-serving presentation for people interested in eastern Beringian palaeo-environmental studies.
Lauriol, Bernard, Yannick Cabana, Jacques Cinq-Mars, Marie-Anne Geurts, and F.Wayne Grimm. 2002. Cliff-top eolian deposits and associated molluscan assemblages as indicators of Late Pleistocene and Holocene environments in Beringia. Quaternary International 87: 59–79.
Abstract:
Northern Yukon cliff-top eolian deposits are indicators ofpast climates and environments. The deposits are located along the Ramparts ofthe Porcupine River, near the international boundary. These eolian deposits resulted from southwest wind regimes that operated at about 14,860 BP, and more certainly at 11,640–8200 BP and from 4600 BP to present. Palynological analysis indicates that these three periods were marked by different vegetation covers: the earliest one being dominated with Cyperaceae, the intermediate one by Shepherdia canadiensis, and the most recent one by spruce (Picea). Molluscs are particularly numerous and diversified, which suggests that the cliff-top deposits were important refuges for these animals. Molluscan assemblages indicate that the climate was wetter at about 14,860 BP than between 11,640 BP and 8200 BP. The xeric regime that marked the latter period is also indicated by gypsum concretions. It is suggested that the molluscs could have been introduced by migratory birds that, in turn, would also have been able to use the snail shells from the eolian deposits as an important dietary element. It is also suggested that the molluscs are relicts of endemic fauna.
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