( 531 ) 



fivstem, as has been pointed out l)y M. Lohest '), X. Stainif.k ''), 

 J. Cornet ') and otliers. 



Before stating our reasons for su|i|iosinii- tiie presenee of a gla- 

 cier in tlio Ardennes during tlie second glacial period, we are 

 willing to admit that J. Gossei.et, who of all geologistst knew most 

 of this mountain range, remarked in reference to this hypothesis : 

 "on n'en trouve aucnn indice serieu.x" ^). Indeed we have hut few 

 indications in support of it. The first to draw attention to this ques- 

 tion was Fr. van Horen, who at the time of the making of the rail- 

 way line between Tirlemont and Jodoigne, found near Kost blocks of 

 quartzites from the Ardennes which presented marks quite similar 

 to the striae caused by glaciers. Van Horen, however, did not feel 

 justified in drawing from this discovery the conclusion of the former 

 existence of a glacier '). A year later C. Mat.aise observed similar 

 marks on blocks of quartzites on the banks of the Givande Geete, 

 close to the spot formerly occupied by (he Abbey of Ramez-les- 

 Jochelette, about JO K.M. from Host"), (i. Dewalque believed to have 

 seen unmistakable striae on blocks of (piartzites in the valley of the 

 Amblève, near Stavelot, on the "llohe Venn" ^). E. Delvaux also 

 noticed these horizontally parallel scratches, lint believes them to 

 have been produced l)y a "torrent enlratnant et roulant pêle-mêle 

 des sables et des caillonx." "). 



Finally, South of Stavelot, on the road to Somagne, G. Dewalque 

 discovered giants' kettles formed by the agency of glaciers "). It is 

 regrettable to find that the more detailed study of this subject has 

 been much impeded by the practice in Belgium of giving the name 



1) Lps depots tertiaii'es de la haute Belglque. Ann. Soc.-géolog. de Belgique XV. 

 Liége 1S87— 88. Mém. p. .J'J. 



^) Le grès blanc de Maizeroul. Ann. Soc. géolüg. de Belgique XVllI. Liége 

 1890—91. Mém. p. til. 



') Etude sur I'Evolution des Rivieres beiges. Ann. Soc. géol. de Belgique XXXI. 

 1903-04. Mém. p. 317, 355. 



*) L'Ardenne, p. 843. 



5) Note sur quelques points relatifs a la geologie des environs de Tirlemont. 

 Bull. Acad. roy. de Belgique (2) XXV. Bruxelles 1868, p. 645, 664 ; 1 PI. 



*) Roches usees avec cannelures de la vallée dc la grande Geethe. 1. c. (2) 

 XXVII, 1879, p. 682-685. 



7) Sur la presence de stries glaciaires dans la vallée de FAmblève. Ann. Soc. 

 géolog. de Belgique. XII. 1884—85. Liège. 1885. Bull. p. 157—158. 



^j Note succincte sur I'excursion de la Socielé géologique a Spa, Stavelot et 

 Lammersdorf en aout-septembre 1885. Ann. Soc. roy. malacol. de Belgique XX. 

 Bruxelles 1885, Mém. p. 19. 



8) Marmites de géants prés de Stavelot. Ann. Soc. géol. de Belgique. XXV. 

 1897-98, p. CXXXVlll. 



