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== Collegamenti esterni ==
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*[http://stratigraphy.science.purdue.edu/charts/Timeslices/3_Late_Cret.pdf Late Cretaceous timescale], at the website of the subcommission for stratigraphic information of the ICS
*[http://norges.uio.no/timescale/Fig18.1_Cret_colA.pdf Stratigraphic chart of the Late Cretaceous], at the website of Norges Network of offshore records of geology and stratigraphy
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