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Boron Isotope Ratios. Boron isotope ratios (d11B) from planktonic foraminifera shells and coral skeletons (calcium carbonate) are used to estimate the pH of sea water in order to reconstruct paleo CO2 levels.. Boron Isotope Ratios. Paleo CO2 is estimated by indirect measurementsBased on the pr
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1. d11B A proxy for Paleo-CO2