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Chesapeake Bay, USA
Reference
Cronin, T.M., Dwyer, G.S., Kamiya, T., Schwede, S. and Willard, D.A. 2003. Medieval Warm Period, Little Ice Age and 20th century temperature variability from Chesapeake Bay. Global and Planetary Change 36: 17-29.

Description
Using the magnesium/calcium (Mg/Ca) proxy method as a paleothermometer, the authors reconstructed a 2200-year record of spring sea surface temperature from four sediment cores taken from Chesapeake Bay (~38.89N, 76.40W). Statistical analyses revealed mean 20th-century temperatures were 0.15C cooler than mean temperatures during the first stage of the Medieval Warm Period, which they delineate as occurring between 450 and 900 AD.