Geological evidence on ancient climates of the earth is important for a better understanding of the nature and consequences of future global climate changes. Using the CLAMP method (calculation of quantitative paleoclimatic parameters from signals coded in the leaf architecture of ancient plants), the author analyzed 20 Albian-Campanian fossil floras and provided conclusions on the Arctic climate in the Cretaceous. Climatic general circulation models (GCMs) are an important instrument for predicting future global climate changes. The findings made it possible to test these models for the mid-Cretaceous.
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