Hind: Carboniferous Geologv 22q 



Belgium was succeeded by a group of beds which he sub- 

 divided : — 



Terrain Houillier, 

 Gres grossier d'Andenne. 



Schistes et Psanimites avec mince couches de houille maigre. 

 Schistes a Mytilus. 



Schistes et Phtanites avec Goniatites and Posidonomya passant 

 vers le has au calcaire impur avec Brachiopodes. 

 Calcaire Carbonifere. 



The upper group he correlated with the Millstone Grit 

 Series, and the lower with the Yoredale beds of the Midlands, 

 i.e., the Series now called Pendlesides. 



Dr. Purves calls attention to the universal occurrence of 

 this Series in Belgium, now known by the name Namurien, 

 and quite recently in the Mons Coalfield, owing to the driving 

 of exploration galleries, M. Cornet has shewn that the Series is 

 present there.* He has found there a very large fauna 

 containing the majority of the zonal indices on which I rely for 

 the identification of the various sub-divisions of the Pendleside 

 Series in England. M. Cornet includes in his list : — 



Prolecanites compressus. 

 Posidonomya becheri. 

 P. membranacea. 

 Glyphioceras reticulatum. 



,, beyrichianum = diadema. 



and he then says, discussing the fauna as a whole : ' Telle 

 qu'elle est, la liste qui procede montre I'homotaxie, des conches 

 de Bandour et, par extension, de notre assise des phtanites 

 Hia, avec le Pendleside Series que notre confrere anglais M. 

 Wheelton Hind, place a la base du terrain honiller du Lan- 

 cashire, etc., entre le Carbonifere inferieur et le Millstone Grit.' 



In addition to the fauna. Mm. Cornet and Renevier have 

 shewn that the flora which we knew to be associated with the 

 Pendleside Series in the British Isles, is fully represented in 

 Belgium. 



Dr. Purves j considers the total thickness of the Namurien 

 Series at Andenne to be i8o metres, of which Le Gres Grossier 

 is 12 metres. 



It is of equal importance to note that notwithstanding the 

 much diminished thickness of the Pendleside Series in Belgium, 

 as compared to the Midlands, that the majority of the zone 



* In Terrain Honilles sans hondle et sa faune dans le Bassi der Cou- 

 chant de Mons ann de la Soc. Geol. de Belgique t. XXXIII. memoirs, 



PP- 139-152. 



f Sop. Supra cit. p. 24. 



igog June i. 



