Palaeotemperature curve for the Late Cretaceous of the northwestern circum-Pacific     

Yuri D. Zakharov  Nataliya G. Boriskina  Alexander V. Ignatyev  Kazushige Tanabe  Yasunari Shigeta  Alexander M. Popov  Tamara B. Afanasyeva  Haruyoshi Maeda 《Cretaceous Research》1999,20(6):685

In the northwestern circum-Pacific, two main trends in Late Cretaceous temperatures can be recognized. (1) In general, a recurrent warming trend is thought to have begun in the Turonian–Campanian, reaching temperature maxima in the early Late Santonian and early Late Campanian, and temperature minima in the earliest Santonian and perhaps early Campanian. (2) During the Maastrichtian, temperatures dropped sharply, with only a slight warming in the early Late Maastrichtian. The existence of a thermal maximum at the Coniacian–Santonian transition has previously been expected, but is not confirmed by new isotopic results.  相似文献