( MO ) 



as in Scandinavia '). It is to be noted that on his first geological map 

 these diluvial beds are not marked out in separate di\isions ^). 



Two years later, however, his attention was arrested by the pecu- 

 liarity that, while in Twente and in the Eastern part oi'Salland and 

 probably over the whole extent of the Veluwe, the principal con- 

 stituents of these erratics were quartzite, red or blackish jasper, near 

 the Havelter hill, before Steenwijk when one conies from the side 

 of Meppel, one suddenly finds the detritus to consist entirely of 

 flints. He noticed the same phenomenon near Steenwijk, the Steen- 

 wijkerwold and even near Vollenhove '). These facts led him to con- 

 clude that two distinct diluvial deposits had taken place, i. e. one 

 of "siliceous material" transported from the Baltic and another 

 "composed of quartz" derived from the Ardeimes. 



In 1854 Staring had modified his theories. To the siliceous for- 

 mation he gave the name of "Scandinavian Diluvium", and the 

 quartz, which he no longer regarded as derived from the Ardennes, 

 received the appellation of "Diluvium of the Rhine", which also 

 included the deposits between the Meuse and the Rhine ; and the 

 beds situated South of the river Lek received the name of Diluvium 

 of the Meuse. He was careful to add however that -. "it would be 

 wrong to deduce from these appellations that Scandinavia alone was 

 responsible for the diluvial formation in the North of Holland, and 

 the Ai'dennes, or the mountains of what at [iresenl is known as the 

 basin of the Meuse, for that of one of its Southern parts and the 

 Rhine for that of the other." ") 



Six yeai'S later Staring again proposed another division which he 

 then considered decisive. Leaving the boundaries of the Scandinaxian 

 Diluvium and those of the Meuse unaltered, the limits of the diluvium 

 of the Rhine were confined to those parts of the Netherlands lying 

 between the Riiine and liie Meuse. The formation Nortii of the Rhine 

 and South of the Vecht was indicated by the name of "mixed dilu- 

 vium" ^), whicii therefore included tiie provinces of Overijsel, Guclders, 

 Utrecht, and the district of the Gooi in North Holland. The charac- 

 teristic feature of this (libninni is the presence of erratics from 



') De Aai'dkunile en de Laiulboiiw in Xederlaiul. Zwolle 1844, p. 14. 



-) Pioef eeiier geologische kaai-t van de Xederlauden. Groningen 1844. 



'■') De Aardkunde van Sallaud en bet Land van Vollenliove. Zwolle 184(j, 

 p. 8, [), 53. 



') Het eiland Urk volgens den Hougleeraar H.arting en hel Nederlandsclie dilu- 

 vium. Verhandel, uitgegeven door de Commissie belast met hel vervaardigen eener 

 geologische kaart van Nederland. 11. Haarlem 18.54, p. 167 m. kaart. 



5) De Bodem van Nederland. II. Haarlem 1860, p. 54—56. PI. 1. 



