( 524 ) 



country '), for Alph. Erexs mentions not less than 15 gravel-pits in 

 the neighbourhood of Maastricht in which he found fragments of 

 tlkese rocks, one being 0.(i M. long and 0.5 M. thick. The most 

 easterly place of deposit known at |)resent is Simpelveld'). Not long 

 ago, Mr. L. Rutten brought me several specimens dug up in the 

 neighbourhood of Sittard. From observations of Erens, it would appear 

 that these erratics are scarce in the Province of North Brabant. He 

 himself found a nice piece at Mook '), and J. Lorié a fragment 

 between Bladel and Postel. 



North of the Rhine they have been discovered in the railway' cuttings 

 near Rhenen and also near Maarn (iji the latter locality the fragment 

 was over '/s M. in diameter), and on the Soester Berg, in the Province 

 of Utrecht. Another piece was found near Eibergen, in Guelders and 

 finally Ekens mentions having seen in the Geological Museum, at 

 Leiden, a fragment found in Overijsel : unfortunately he does not 

 state the exact spot at which it was found *'). 



2. Carhoniferuus system. Ferd. Roemer has given a description 

 of a few fragments of black carboniferous limestones containing 

 Productus striatus Fisch. found in the Gooi, near Hilversum and 

 sent to him for analysis by Staring. He came to the conclusion that 

 they were derived from the carboniferous limestone of the district 

 between Ai.\-la-Chapelle and Stolberg*). 



Staring on the contrary believed them to have been transported 

 from Vise on the Meuse, in Belgium, and based his opinion on the 

 similarity of their composition witii the limestone found in that part 

 and also on the almost total absence of this rock from Westphalia.") 

 Although fragments of carboniferous limestone from Ratingt'n. N.W. 

 of Dusseldorf, might have found their way to the Netherlands, the 

 fact that no traces of the said fossil have ever been observed in 

 those rocks '), evidently keeps them outside the discussion. It is 

 true that in the district between Aix-la-Chapelle and Stolbei'g, the 



1) J. LoRiÉ e.g. found several fragments near Lancklacr on the Zuid-Willemscanal. 



-) Note sur les roches cristallines lecueiilies tlans les depots de transport dans 

 la partie meridionale du Limbourg hollandais. Ann. de la Soc. géolog. de Relgigue. 

 XVI. 1888—89. Liége. Mém. p. 417—420. 



•') Recherches sur les formations diluviennes du sud des Pays-Bas. Archives 

 Teyler (2) III. 6*'^'"'' partie. Haarlem 1891, p. 23, 33. 



■*) Recherches sur les formations diluviennes. 1. c. p. 67. 



°) Ueber Hollandische Diluvial-Geschiebe. Neues Jahrb. f. Mineralogie. 1857, p. 389. 



«) De Bodem van Nederland. II. Haarlem 1860, p. 96. 



■7) H. voN DECHE^. Erlautcrungen zur geologischen Karte des Rheinlandes und 

 der Provinz Westfalen. 11. Bonn 1884, p. 216. 



