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series of rocks

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CharlesE-S | 21:25 Tue 22nd Jun 2004 | History
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Name of series of rocks formed between Triassic and Jurassic periods
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Mesozoic era lasted c. 250 million years and consisted of Triassic (trias = triad) 51 million years inc. Lower, Middle and Upper Triassic. Then 54 million years long Jurassic (Jura Mountains) consisting of Early, Lower, Middle and Upper Jurassic ). Then Cretaceous (Latin creta = chalk) 80 million Lower and Upper Cretaceous
00:41 Tue 06th Jul 2004

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series of rocks

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