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Encyclopedia Britannica



AVONIAN

This article appears in Volume V03, Page 67 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: AUD-BAI
AVONIAN , in
geology
 , the name proposed by Dr A.
Vaughan
  in 1905 (Q.J.G.S. vol. lxi. p. 264) for the rocks of
Lower
  Carboniferous age in the
Avon
  gorge at Bristol. The Avonian stage appears to embrace precisely the same rocks and fossil-zones as the earlier designation " Dinantien " (see CARBONIFEROUS
SYSTEM
 ) ; but its substages, being founded upon different local conditions and a different interpretation of the zonal fossils, do not correspond exactly with those of the
French
  and Belgian geologists.
Substages. ZONES. Substages.
Kidwellian .Dibunophyllum-
Seminula
Syringothyris
Clevedonian Zaphrentis Tournaisien ,Cleistopora
The upper Avonian (Kidwellian) is well developed about Kidwelly in
Carmarthenshire
 . The
lower
  substage (Clevedonian) is well displayed near Clevedon in Somerset.
See A.
Vaughan
 , " The Carboniferous
Limestone
 
Series
  (Avonian) of the
Avon
  Gorge," Proc. Bristol Naturalists' Soc., 4th
series
 , vol. i. pt. 2, 1906, pp. 74-168 (many plates) ; and T. F. Sibley, " On the Carboniferous
Limestone
  (Avonian) of the Mendip area (Somerset)," Q.J.G.S. vol. ]Iii., 1906, pp. 324-380 (plates). (J. A. H.)


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