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Sierra Nevada, California, USA
Reference
Lloyd, A.H. and Graumlich, L.J. 1997. Holocene dynamics of treeline forests in the Sierra Nevada. Ecology 78: 1199-1210.

Description
3500-year histories of (1) treeline elevation fluctuation and (2) tree abundance were derived for five sites in the southern Sierra Nevada (~36.5N, 108.25W). The results indicated (1) synchronous increases in treeline elevation from AD 800 to 900 and (2) an episode of high tree abundance above the current treeline between AD 700 and 1200, which implies warmer-than-present temperatures during that period of time.