326 M. Boue'ow 



on its great rarity in other countries, and this again shews 

 us that in geology, in order to recognise a formation in any 

 country, the deposite should have been studied in the coun- 

 try where it is most completely developed, this principle is 

 especially applicable to the recent secondary formations, 

 . which are more than others the deposites of great basins or 

 •sinuosities more or less separated from each other. 



Thus if it is not surprising that a French geologist, who 

 has not studied the quadersandstein in Germany, should not 

 recogi'.ise it in France where it is scarce ; on the other hand, 

 we should not be surprised that a German, wlio has not 

 visited the well characterized tertiary rocks in the north of 

 . France, should find himself embarrassed how to class certain 

 "" scattered deposites in his own countiy. In Europe, for tlie 

 same reasons, the muschelkalk and zechstein formations 

 I should be studied in Germany, whilst the oolite formation 

 and chalk should be seen in Switzerland, France, and Eng- 

 land, and not in the north of Germany ; the trachytic depo- 

 sites in Hungary and not on the banks of the Rhine; the 

 extinct volcanoes and patches of ancient basaltic coulees in 

 Auvergne and in the Vivarais and not at the Eiffel, Eger, or 

 in the Mittclgebirge ; the basaltic Iluttonian cones in Hesse 

 and Thuringia and not in Bohemia; the trap rocks of the 

 red sandstone in Scotland and the Palatinate, and not at 

 Noyant or Figcac in France, &c. 



The quadersandstein or third arenaceous secondary forma- 

 tion rests on the true muschelkalk, between Hildesheim and 

 Dickholzen, near Helmstadt, at the chapel of Lindach, be- 

 tween Wipfeld and Lindach, not far from Scheveiifurt on 

 the Mein, at Stegerwald, near Hassfurt, and muschelkalk 

 has been attained in a well in the quadersandstein of the 

 garden of Nesselhof, near Gotha. We sometimes see, in the 

 environs of Coburg, a magnesian variety of muschelkalk 

 dip beneath the quadersandstein, as near Oferfullbach. 

 In Westphalia, we see the beds of tlie muschelkalk band, 

 extending from Steinheim, by Bielfcld, to Hilter, dip to the 

 N. and the oolite marls alternating with the quadersand- 

 steio rest on it, possessing the same dip. Near Pyrcnont, 



