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Paleoaltimetry methods suffer from uncertainties in interpretation and analysis. Paleobotanical methods imply climate conditions that are consistent with a low-elevation (1160 ± 600 m) Altiplano plateau (1). Yet climate predictions using leaf morphologies are based on modern empirical correlations with plant physiognomy that may not be appropriate for ancient plant communities or at high altitudes (8). Clumped-isotope thermometry of late Miocene Altiplano carbonates indicates that growth temperatures have decreased with time, a trend that is consistent with surface uplift (2, 9). However, growth temperatures for similarly aged deposits show large variability (up to >20°C) that is not completely understood (9) and may reflect processes other than adiabatic cooling.
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Supporting material is available on Science Online
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Supporting material is available on Science Online.
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77951546518
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note
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18O signal can be ascribed to adiabatic cooling through surface uplift.
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77951574561
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note
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D. Pollard and J. Poulsen provided support with the GENESIS AGCM and data analyses, respectively. This work was funded by grants to C.J.P. and T.A.E. from NSF (EAR Awards 0738822 and 0907817) and the University of Michigan's Graham Environmental Sustainability Institute. C.J.P. also received support from the Alexander von Humboldt Foundation.
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