Urgonianadj.
Geology.
Forming or belonging to a series of massive limestones of the Lower Cretaceous system as developed at Orgon in the Durance valley.
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the world > the earth > structure of the earth > age or period > stratigraphic units > [adjective] > secondary or Mesozoic > Cretaceous > specific
Wealden1828
Speeton1829
Neocomian1843
Albian1846
Senonian1850
Urgonian1856
Santonian1869
Maastrichtian1885
Valanginian1885
Vectian1885
Barremian1903
1856 Q. Jrnl. Geol. Soc. 12 69 M. d'Orbigny's Urgonian series, or upper division of the Neocomian group.
1888 J. W. Dawson Geol. Hist. Plants 282 These beds are regarded as Lower Cretaceous (Urgonian).
This entry has not yet been fully updated (first published 1926; most recently modified version published online June 2019).
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adj.1856