ИСТИНА

Closed basins or lake systems in general and the Caspian Sea, in particular, are important paleoclimate archives that preserve paleogeographic and hydrologic responses to critical periods in Quaternary history, such as glacial-interglacial cycles. Stable isotope measurements of δ18O biogenic carbonate are indicators of paleogeographic variability in such systems throughout the geologic record. It is a common misconception that these measurements can be easily applied to create accurate estimates of past temperatures.