328 ' M. Boue' on 



upper marine sandstone of Fontainebleau, as at the Sche- 

 velbenwald, and at the top of the Kotersburg, near Pyr- 

 mont ; we also sometimes see, as at Fontainebleau, cry- 

 stals of (inverse) carbonate of lime, as for example, at 

 Blankenburg. The quartz occasionally forms small veins. 



It very often happens that parts of this sandstone are de- 

 composed into a yellow or white sand, as at the foot of 

 Mont Bomberg at Pyrmont, and at the Kontersberg, where 

 this sand resembles the iron sand of the English. These 

 sands, in other localities, produce an extensive moveable 

 surface, as between Blankenburg and Halherstadt, and 

 especially in the N.E. of Bohemia. 



The colours of the quadersandsttin are white, whitish 

 yellow, yellow, brownish, and rarely of a roseate tint ; the 

 first varieties abound in the north of Bohemia, Saxony, and 

 on the north of the Hartz, while the yellow and brownish 

 varieties are met with round the oolite chain of the S.W. of 

 Germany ; the latter do not furnish as good building stones 

 as the others. 



The subordinate beds of this formation are not numerous ; 

 in the lower strata wc often observe coarse beds, in which 

 quartz pebbles are found associated with pieces of flinty 

 slate and Lydlan stone ; this is seen near Vigy not far from 

 Metz, and in the Erzgebirge, for example at Kisibel, &c. 

 It happens in the latter chain, near Freyberg, that these 

 beds contain numerous pieces of white granular quartz, iden- 

 tical with the quartzose gangues of many metalliferous veins 

 in the gneiss. 



Sometimes we also observe slightly marly beds in the 

 quadersandstein ; this is seen in the sandstone of Pima, 

 Gotha, and Silesia. We often observe in the upper beds a 

 thickness of some feet or fathoms occupied by alternations of 

 ferruginous yellow sandstone with clays and clayey marls, 

 ■which are grey, blueish grey, greenish grey, and even red- 

 dish, as near Oberfulbach in Coburg, and at Vigy near 

 Metz. The beds of clay are sometimes advantageously 

 employed for pottery, as at Kipfendorf (Coburg), but these 

 beds are rarely thick enough to be worked in the same man 



