746 STRATIGRAPHICAL GEOLOGY. [Book VI. 
in 
in 
Aas SAa8 Sus 
~~ el aS 
mn > mM So 
Sesh See 28 
§asq das EA 
oop ov eg Si 
SASh Aaa 2a 
a sa) R 
(Limestone of Visé. Often poor in fossils, but 
distinguished by Productus giganteus. 
Limestone of Limont (Napoleon marble of 
Boulonnais). Fossils numerous, Productus 
undatus, P. semireticulatus, Spirifera glabra, 
S. duplicicosta, Rhynchonella pleurodon, 
Terebratula sacculus : 
Limestone of Haut Banc, compact or oolitic 
in south part of Sambre basin, with Pro- 
ductus sublevis; but in north part of that 
basin, as well as on the Meuse and in the 
Boulonnais, Productus cora replaces P. 
sublevis : 40 
Dolomite of Namur, well developed between 
Namur and Liege, and extending into the 
250 <Assise VI. 
o 
Saas 
e 
=) 
Boulonnais (Hure dolomite), alternating 150, Assise V. 
with grey limestone, containing Chonetes . 
comoides 40 
Limestone of Bachant, grey, bluish-black, or 
black, with cherts (phtanites). Productus 
cora (and sometimes P. giganteus), Spirifera 
tricornis, Dentalium priscum, Euomphalus 
cirrotdes, Nautilus sulcatus, Orthoceras 
munsterianum 35 100 Assise IV. 
4 Limestone of Waulaort, prey, often dolomitic ; ; 
only seen in area of the Meuse, Spirifera A 
cuspidata, Conocardium aliforme  . 0 100 Assise III. 
Limestone of Anseremme, grey and blue- 
veined limestone and dolomite. Productus 
semireticulatus, Spirifera ua hala S. cus- 
pidata, Orthis resupinata 8 60 Assise II. 
Limestone of Dinant, only found in the 
Meuse area. Productus semireticulatus, 
P, Flemingii, Pecten intermedius . 0) 
Limestone of Ecaussines (‘‘ petit granite”), 
crinoidal limestone. Phillipsia gem- 
mulifera,Productus semireticulatus,Spirifera 
mosquensis, Orthis crenistria, O. Michelint, 
Leptxna rhomboidalis  . 25 
Limestones and shales of Avesnelles, black a 
limestone (16 metres), resting upon ar- 
Carboniferous Limestone—Caleaire Carbonifére, Systeme Calcareux. 

100 = Assise I. 
gillaceous shales (40 metres). “Among the 
numerous fossils of the limestone are Pro- 
ductus Flemingii, P. Heberti, Chonetes 
variolaris, Rhynchonella pleurodon, Spirifera 
mosquensis, Huomphalus equalis, Pecten 
Sowerbyt é : 

( 258 7 760 metres. 
The base of these strata passes down ef eben into the Devonian 
system, with which, alike by paleontological and _petrographical 
characters, it is closely linked. ‘The Carboniferous rocks of the north 
of France and of Belgium have undergone considerable disturbance. 
A remarkable fault (“la grande faille” of this region) resulting from the 
rupture of an isoclinal syncline, and the consequent sliding of the inverted 
side over higher beds, runs from near Lidge westwards into the Boulon- 
nais, with a general but variable hade towards the south. On its 

