- llanvirn
- llan·virn
English syllables. 2014.
llanvirn
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LLANVIRN — ou LLANVIRNIE Étage de l’Ordovicien inférieur. Ce terme a été créé en 1875 par Hicks pour désigner les schistes de la localité de Llanvirn (pays de Galles). Cet étage est caractérisé par des graptolites: Didymograptus murchisoni et Didymograptus… … Encyclopédie Universelle
llanvirn — (ˈ)lan|vi(ə)rn, |vərn adjective Usage: usually capitalized Etymology: from Llanvirn, subdivision of the European Ordovician : of or relating to a subdivision of the European Ordovician see geologic time table … Useful english dictionary
Ordovician — Period 488.3–443.7 million years ago … Wikipedia
ORDOVICIEN — L’Ordovicien est une période d’une soixantaine de millions d’années qui s’étend de la fin du Cambrien au début du Silurien. Le terme «Ordovicien» (emprunté à la tribu des Ordovices qui vivait dans le nord du pays de Galles) a été créé par C.… … Encyclopédie Universelle
Лланвирнский ярус — лланвирн [от названия населенного пункта Лланвирн (Llanvirn), Уэльс, Великобритания], третий снизу ярус ордовикской системы (периода) (См. Ордовикская система). Выделен в 1881 английским геологом Г. Гиксом в графстве Пембрукшир… … Большая советская энциклопедия
Spore — For other uses, see Spore (disambiguation). Spores produced in a sporic life cycle. In biology, a spore is a reproductive structure that is adapted for dispersal and surviving for extended periods of time in unfavorable conditions. Spores form… … Wikipedia
Middle Ordovician — The Middle Ordovician (from 472 to 461 million years ago) is the second subdivision of the Ordovician period. During this time warm shallow sea covered much of the land, and was home to a rich diversity of marine life. Traditionally the Middle… … Wikipedia
Evolutionary history of plants — Plants have evolved through increasing levels of complexity, from the earliest algal mats, through bryophytes, lycopods, ferns and gymnosperms to the complex angiosperms of today. While the simple plants continue to thrive, especially in the… … Wikipedia
Geology of the Iberian Peninsula — The geology of the Iberian Peninsula consists of the study of the rock formations on the Iberian Peninsula, which includes Spain, Portugal, Andorra, and Gibraltar. The peninsula contains rocks from every age from Ediacaran to Recent, and almost… … Wikipedia
Arenig — In geology, the Arenig group is the name applied to the lowest stage of the Ordovician System. HistoryThe term was first used by Adam Sedgwick in 1847 with reference to the Arenig Ashes and Porphyries in the neighborhood of Arenig Fawr, in… … Wikipedia
