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Paleoceanography Notes:
 * Topics of Paleoceanography include Surface-sea Temperature, Bottom-sea Temperature, Salinity, Ocean Circulation, Acidity, pH, and Alkalinity.
 * Proxies are the main focus on determining how the ocean's behaved in the past.
 * Oxygen-18 isotopes are useful in determining past sea surface temperatures.
 * Element ratios are useful in determining how the ocean's circulations were in the past.
 * Shellfish shells are useful in determining CO2 concentrations in the oceans in the past.