The Turonian is, in the ICS` geologic timescale, the second age in the Late Cretaceous epoch, or a stage in the Upper Cretaceous series. It spans the time between 93.5 ± 0.8 Ma and 89.3 ± 1 Ma (million years ago). The Turonian is preceded by the Cenomanian stage and underlies the Coniacian stage. At the beginning of the Turonian an anoxic event....
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http://en.wikipedia.org/wiki/Turonian
• (n.) One of the subdivisions into which the Upper Cretaceous formation of Europe is divided.
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http://thinkexist.com/dictionary/meaning/turonian/
Turonian is one of the geological subdivisions into which the Upper Cretaceous formation of Europe is divided.
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http://www.probertencyclopaedia.com/browse/HT.HTM
European stage of the Upper Cretaceous, spanning the time between 91 and 90 million years ago.
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https://www.encyclo.co.uk/local/21202
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