264 M. i)E Bonnard's Notices 



uniform, and without remarkable escarpments in the grey- 

 wacke of which the greatest part of the Hartz is formed : it 

 is not the same with the granitic portions ; the valleys of the 

 Bode, the Use, and the Ocker offer both pictureseque and 

 Taried points of view, which recall to mind those of high 

 ■mountain scenery. Without perceiving a very striking dif- 

 ference, we shall yet remark the depth and steep sides of 

 the valleys of the Oder, the Sieber, and their confluents, 

 i. e. in the environs of Andreasberg, a country placed be- 

 tween the two principal southern branches we have noticed, 

 but formed of rocks of schist and quartz, different from 

 greywacke, and considered to be of more ancient for- 

 mation. 



On the N. and N.E. the Hartz mountains are as it were 

 suddenly cut off, and a few hills only are observed in the rich 

 and extensive plains of Blankenburg, Halberstadt, Goslar, 

 and Wolfenbiittel ; on the S., where the slope is much less 

 steep, a country of plains and low hills also occurs at the 

 foot of the Hartz. On the S.E., on the contrary, the moun- 

 tains gradually become lower, and the hills forming the 

 Mansfeld country may be considered as constituting an ap-? 

 pendage of the Hartz mountains. 



li. On the relative antiquity of the forviations in the Hartz. 



When a group of mountains is formed, like the Hartz, 

 partly of granite, partly of other crystalline and hard rocks 

 and argillaceous or flinty slates which do not contain a trace 

 of organic remains, partly of varieties of sandstone and pud- 

 ding-stone known by the name of greywacke, alternating 

 with a more or less micaceous clay slate (grauwacken schie- 

 fer"), both containing the impressions of vegetables and 

 shells, and partly of calcareous rocks, which appear entirely 

 composed of madrepores and which occur united with the 

 two last rocks, we are naturally led to consider the granite 

 as constituting the nucleus of the whole ; the crystalline 

 greenstones (diabases), the diallage rocks, the hornfels, the 



