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Encyclopedia > Arenig

In geology, the Arenig group is the name applied to the lowest stage of the Ordovician System. The term was first used by Adam Sedgwick in 1847 with reference to the "Arenig Ashes and Porphyries" in the neighborhood of Arenig Fawr, in Merioneth, North Wales. The rock-succession in the Arenig district has been recognized by W. G. Fearnsides (“On the Geology of Arenig Fawr and Moel Llanfnant," Q.J.G.S. vol. lxi., 1905, pp. 608–640, with maps). The above succession is divisible into: (1) a lower series of gritty and calcareous sediments, the “Arenig Series" as it is now understood; (2) a middle series, mainly volcanic, with shale, the "Llandeilo Series"; and (3) the shale and limestones of the Bala or Caradoc Stage. It was to the middle series (2) that Sedgwick first applied the term "Arenig." In the typical region and in North Wales generally the Arenig series appears to be unconformable upon the Cambrian rocks; this is not the case in South Wales. The Arenig series is represented in North Wales by the Garth grit and Ty Obry beds, by the Shelve series of the Corndon district, the Skiddaw slates of the Lake District, the Ballantrae group of Ayrshire, and by the Ribband series of slates and shale in Wicklow and Wexford. It may be mentioned here that the "Llanvirn" Series of H. Hicks was equivalent to the bifidus shale and the Lower Llandeilo Series. Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason)) is the science and study of the Earth, its composition, structure, physical properties, history, and the processes that shape it. ... The Ordovician period is the second of the six (seven in North America) periods of the Paleozoic era. ... Adam Sedgwick Adam Sedgwick (March 22, 1785–January 27, 1873) was one of the founders of modern geology. ... Arenig Fawr is a mountain in southern Snowdonia, north Wales. ... Merionethshire (Meirionnydd in Welsh) is a traditional county of Wales. ... North Wales is the northernmost region of Wales, bordered to the south by Mid Wales. ... Llandeilo is a town in Carmarthenshire, west Wales situated at the crossing of the River Tywi by the A40 on an elegant stone bridge. ... Bala has several meanings: Three places: Bala, Greece, a suburb of Athens, it is also a Modern Greek word for ball. ... The name Caradoc may refer to: In Arthurian legend, Sir Caradoc was one of the Knights of the Round Table. ... The Cambrian is a major division of the geologic timescale that begins about 542 Ma (million years ago) at the end of the Proterozoic eon and ended about 488. ... TIME cover featuring Garth Brooks, March 1992 Troyal Garth Brooks (born February 7, 1962 in Tulsa, Oklahoma) is an American singer, songwriter, actor, and charity director who performs country music. ... Skiddaw is a mountain in the Lake District National Park in the United Kingdom. ... Ayrshire (Scottish Gaelic, Siorrachd Inbhir Àir) is a traditional county in south-west Scotland, located on the shores of the Firth of Clyde. ... Wicklow (Cill Mhantáin in Irish) is the county town of County Wicklow in the Republic of Ireland. ... Wexford (Irish: Loch Garman) is the county town of County Wexford in the Republic of Ireland. ...


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ARENIG GROUP - Online Information article about ARENIG GROUP (336 words)
Sedgwick in 1847 with reference to the " Arenig Ashes and Porphyries " in the neighbourhood of Arenig Fawr, in See also:
It was to the middle series (2) that Sedgwick first applied the term " Arenig." In the typical region and in North Wales generally the Arenig series appears to be.
The Arenig series is represented in North Wales by the See also:
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