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Encyclopedia Britannica - Main :: AUD-BAI |
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AVONIAN , in geology , the name proposed by Dr A. Vaughan
Lower
Avon
SYSTEM
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
lower
See A. Vaughan
Limestone
Series (Avonian) of the Avon
series , vol. i. pt. 2, 1906, pp. 74-168 (many plates) ; and T. F. Sibley, " On the Carboniferous Limestone
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