Abstract
The Cretaceous deep-sea record of the Santonian–Campanian transition is commonly interrupted by an extensive unconformity (representing c . +1‰) early Campanian shift. We propose the Santonian–Campanian climatic transition was not gradual but was the first major cooling step after sustained mid-Cretaceous hothouse conditions. Supplementary material: Detailed analytical methods including biostratigraphic notes and Sr isotopic chronology, supplementary figures (locality map; additional geochemical, isotopic and micropalaeontological results; palaeomagnetic results; global Sr isotope compilation and age model; benthic foraminiferal stable isotope compilation), tables of microfossil occurrences and numerical data are available at http://www.geolsoc.org.uk/SUP18598.
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