326 SECTIONAL TRANSACTIONS.— C. 



During these last years Mr. W. S. Bisat has successfully worked the Carboniferous. 

 Goniatites in Yorkshire and Lancashire, and has established a fine succe.ssion based 

 on their species and varieties ; he has shown that one might distinguish no fewer 

 than thirty-six zones and sub-zones of Goniatites between Upper Dinantian and 

 the Middle Coal Measures. 



However, his classification did not extend downwards beyond the Middle and 

 the Lower Dinantian, because these levels (I mean the Lower Vislan and the 

 Tournaisian) are reduced or even, in some places, not represented at all in the north 

 of England. 



In Germany, Hermann Schmidt worked also the Carboniferous Goniatites and 

 published a succession of zones, of which the main lines correspond pretty well with 

 those established in England. In Coal Measures he was able to extend his divisions 

 a little higher. Moreover, he extended his zones downwards to the base of the 

 Dinantian. 



He distinguished in the Dinantian three main divisions : 



I granosum. 

 III. Glyphioceeas \ striatum. 

 I crenistria. 

 I Kochi. 

 II. Pericyclus ^ plicatilis. 

 I princeps. 



[ Lyoni. 



According to H. Schmidt, his Glyphioceras Stufe should equal the Vis6an, his 

 Pericyclus Stufe the Tomnaisian, and his Protocanites Stufe corresponds to the 

 Etrceungt Zone of French authors (=K2). But if one looks to the species he 

 refers to, his Olyphioceras Stufe represents only D2-3, not the whole Visean. In 

 Toiu-nai, Pericyclus princeps is in CI, and is nowhere known lower than this level. 

 That shows immediately that this succession has been established by Hermann 

 Schmidt on a non-complete sequence. 



The sequence is complete in the Bristol area and South Wales, and it is known 

 in detail, thanks to the Geological School of Bristol University. It is also complete 

 in the north of France and Belgium. These are the places where one might expect 

 to get a chance to establish a succession of zones of Goniatites, as A. Vaughan 

 succeeded in establishing the succession of Corals and Brachiopods. 



In the first place, it is essential to have a well-defined base. In the north of 

 France this lower limit has been established bj' J. Gosselet, both on petrographical 

 and palaeontological evidence. He called the base Zone d' Etrceungt (=K2) ; it is 

 formed by shales interbedded with limestone containing the first carboniferous 

 species (Spirifer tornacensis, semi-reticiilate Producti), still a reduced lot of Devonian 

 forms (such as Spirifer Verneuili), together with a number of species limited to that 

 level (Clisiophyllum Omali^isi). 



The Goniatites of Upper Devonian have been accurately determined and their 

 zones established in Germany by Wedekind and Schindewolf. I only mention here 

 the uppermost zones : 



VII. Oattendorfia. 

 VI. Wocklumeria. 

 V. LoBvigites. 



In brief, we look to find in the Etrceungt Beds of Avesnes (north of France) 

 CymcLclyrnenia camerata, which is a well-defined species of the Wocklumeria Zone {see 

 Annates de la Societe geologique du Nord, 54, p. 99, pi. vi., figs. 1-3, 1929). 

 That settles the question about the bottom of the Dinantian : the so-called Zone 

 d'EtrcBungt (=K2) corresponds to t\\e Hangeiiherg-Schichten of German authors, and, 

 palseontologically, to their Wocklumeria Zone. 



The Lcevigites Zone is Upper Famennian. 



The Oattendorfia Zone (with Aganides intermedius and different species of 

 Gattendorfice) probably corresponds to the Z Beds, although, until now, no Goniatites 

 have been found from that level in the north of France nor in Belgium. 



A very rich fauna of Goniatites is known from the CI Beds (= Upper Tournaisian) 

 in Tournai and also in the east of Belgium. Another one has been gathered in 



