In the geological timescale, the Berriasian is an age or stage of the Early Cretaceous. It is the oldest or lowest subdivision in the entire Cretaceous. It spanned the time between 145.5 ± 4.0 Ma and 140.2 ± 3.0 Ma (million years ago). The Berriasian succeeds the Tithonian (part of the Jurassic) and precedes the Valanginian. ==Stratigraphic defi...
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http://en.wikipedia.org/wiki/Berriasian
European stage of the lowermost Lower Cretaceous, spanning the time between 135 and 131 million years ago.
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https://www.encyclo.co.uk/local/21202
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