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Encyclopedia Britannica - Main :: APO-ARN |
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ARENIG GROUP , in geology, the name now applied by British geologists to the lowest stage of the Ordovician System
term
Adam
Sedgwick in 1847 with reference to the " Arenig Ashes and Porphyries " in the neighbourhood of Arenig Fawr, in Merioneth, North Wales.The rock
district
c,'i o S Dicranograptusshales. U Derfel or Orthislimestone. 0 -o ^ (unconformity) The above succession is divisible into: (I) a Iwer series of gritty and calcareous sediments, the Arenig Series ," as. it is now understood; -(2) a middle series, mainly volcanic, with shales, the " Llandeilo Series "; and (3) the shales and lime-stones of the Bala
Sedgwick first applied the term
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
district
Wicklow
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