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Petaluma Marsh, Northern California, USA
Reference
Ingram, B.L., De Deckker, P., Chivas, A.R., Conrad, M.E. and Byrne, A.R. 1998. Stable isotopes, Sr/Ca, and Mg/Ca in biogenic carbonates from Petaluma Marsh, northern California, USA. Geochemica et Cosmochimica Acta 62: 3229-3237.

Description
The authors conducted isotopic (18O/16O and 13C/12C) and elemental chemical analyses (Sr/Ca and Mg/Ca ratios) of sediment cores taken from Petaluma Marsh, San Francisco Bay, Northern California, USA (~38.2N, 122.55W), in an effort to reconstruct a record of paleoenvironmental change in this region over the past 700 years. Higher δ18O and Mg/Ca values were discovered between 600 and 700 cal yr BP, indicating "drier and warmer conditions during the end of the Medieval Warm Period."