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Ultimo aggiornamento 2011-10-23
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== liên kết ngoài ==*geowhen database - valanginian*mid-cretaceous timescale and ühttp://stratigraphy.science.purdue.edu/charts/timeslices/5_jurcret.pdf jurassic-cretaceous timescale], at the website of the subcommission for stratigraphic information of the ics*stratigraphic chart of the lower cretaceous, at the website of norges network of offshore records of geology and stratigraphy
==external links==*geowhen database - valanginian*mid-cretaceous timescale and ühttp://stratigraphy.science.purdue.edu/charts/timeslices/5_jurcret.pdf jurassic-cretaceous timescale], at the website of the subcommission for stratigraphic information of the ics*stratigraphic chart of the lower cretaceous, at the website of norges network of offshore records of geology and stratigraphy