白垩纪温室效应盛行 ,同位素记录、陆源和海洋生物的古生物地理学、树叶外形和对气候敏感的沉积物分布都表明了其温度比目前温暖 ,尤其是在高纬地区 ( Barron,1 983 ;Herman和 Spicer,1 997;Frakes,1 999)。虽然有变暖的证据 ,但是对高纬的环境还是有争议的。已引入南极大陆冰 Cretaceous greenhouse effects are prevalent, with isotopic records, paleontology geology of terrestrial and marine organisms, leaf shapes and climate-sensitive sediment distributions indicating that their temperature is warmer than they are currently, especially at high latitudes (Barron, 1983; Herman And Spicer, 1997; Frakes, 1999). Although there is evidence of warming, the environment at high latitudes is still controversial. Antarctica has been introduced into the ice