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" ... In general, when looking at the turtle fossil record, they are nearly always absent from fossil deposits found at high latitudes. Turtles are ectothermic, and potentially more vulnerable to shifts in global temperature and climate, thus explaining their absence from cold conditions above the 60 degree line. The only collection that contains any “appreciable” richness of chelonians is in Nunavut (extreme northern Canada) from an assemblage of fossils that also dates from the same period as the CTM. The evidence presented in this study indicates that the warm Cretaceous climate did in fact impact the diversity and distribution of Mesozoic turtles. ... "