Volgianadj.
/ˈvɒlɡɪən/ Geology.
Of, pertaining to, or designating a stage of the Upper Jurassic and Lower Cretaceous in Russia. Also absol.
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Volgian1893
1893 A. Geikie Text-bk. Geol. (ed. 3) 919 Some of the recognized [Jurassic] life-zones of western Europe can be detected in Russia... [These include] Volgian, consisting of green, brown and dark sandstones and sands.
1955 E. Neaverson Stratigr. Palaeontol. (ed. 2) xii. 473 The lower beds of the Russian Volgian stage..may be correlated with the Upper Kimmeridge Clay of England.
1978 Nature 13 July 132/2 The fault-controlled stepwise submergence of the block-faulted basin culminated in Middle Volgian times with the most important Mesozoic phase of block-faulting in the region.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).
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adj.1893