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Sombre Lake, Signy Island, Antarctica
Reference
Noon, P.E., Leng, M.J. and Jones, V.J.  2003.  Oxygen-isotope (δ18O) evidence of Holocene hydrological changes at Signy Island, maritime Antarctica.  The Holocene 13: 251-263.

Description
Primarily summer climatic conditions were inferred from a δ18O record preserved in authigenic carbonate retrieved from sediments of Sombre Lake (6043'S, 4538'W) on Signy Island, maritime Antarctica.  The Medieval Warm Period (AD 1130-1215) was warmer than the Current Warm Period.