Vol. 65.] 



CARBONIFEROUS LIMESTONE OF COUNTY CLAEE. 



501 





Belgian sequence. 

 (M. M. Dupont.) 1 



! | 



County Clare. 





 fcJO 



Waulsohtian Phase. 



' Calcaire gris a veines bleues 

 et dolomiegrise et calcaire 

 gris souvent magnesien, 

 dont un groupe des couches 

 est rempli de noyaux 

 spathiques radies.' 

 (Assise IV, op. cit. p. 623.) 



Sirixgothtris Zone. 



Grey, white, and black- 

 veined and mottled lime- 

 stones, often magnesian 

 and becoming a true dolo- 

 mite at the top. Certain 

 beds are crowded with 

 bryozoa, which give in 

 cross-section a charac- 

 teristic spotted appearance 

 to the rock. 







The following list comprises a few of the more important 

 fossils which are common at this level in the two areas. 

 (My authorities for the Belgian forms are Prof. Gosselet 

 and L. Gr. de Koninck) : — 



Spirifer subcinctus. 



Spirifer pinguis. 



Syrivgothyris cuspidata. 



Productus semireticulatus. 



Spirifer attenuatus. 

 Dielasma kingi. Dielasma hastatum. 

 Athyris ingens = Athyris aff. glabristria. 



Vestinautilus carinifev. 



Conocardium hibernicum. 



Cardiomorpha egertoni. 



Eiiomphalus pentangulatus. 





Toumaisian. 



' Calcaire a crinoides, avec 

 schistes argileux. . .a la base : 

 sans schistes... a la partie 

 moyenne ; avec phtanites a 

 la partie superieure.' 



Crinoidal limestone with the 

 Lower Limestone Shales 

 below, and a well-marked 

 eherty horizon at the 

 summit. 





The Seminula Zone. 



The distinction between a lower subzone (S L ), containing sur- 

 vivors of a Toumaisian fauna, and an upper subzone (S ) is not 

 well marked in County Clare ; and, although the base is defined 

 by a characteristic faunal assemblage distinct from that of the 

 Syringothyris Zone, with no horizon of faunal overlap, the topmost 

 beds of the zone merge insensibly into those of the Dibunophyllum 

 Zone. 



1 Bull. Acad. Roy. Belg. ser. 2, vol. xx (1865) pp. 621 et ssgq. 



