292 Professor Sedgwick and Mr. Murchison on the 



better with the distribution of the great mineral masses towards Lautenthal. And hence we conclude 

 that the whole section (woodcut, p. 286) is in a reversed position*. 



In the previous details we have endeavoured to give some notion of the forma- 

 tions occupying a triangular area extending from the northern extremity of the 

 chain to a line drawn from Osterode to the Ocker Thai. This we regard as one of 

 the fragmentary masses of the Hartz ; and according to our interpretation of them, 

 the formations are composed of Silurian and Devonian rocks, ascending (in the 

 highest parts of the section) to the base of the carboniferous system. 



Section from the Granite of the Brocken through the Limestone of Elbing erode to the 

 Granite of the Rosstrappe on the Bode. — (PI. XXIII. f. 17.) 



It forms no part of our object to describe the granite of the Brocken ; neither 

 can we dwell on the bristling peaks of granite that fringe the cleft, a thousand feet 

 in depth, through which the Bode escapes from the mid region of the Hartz into 

 the plains of Quedlinburg. Still less are we called upon to describe the secondary 

 rocks which appear at the south-eastern extremity of our section (PI. XXIII. f. 17). 

 They are placed there only for the purpose of giving a general notion of the great 

 movements to which these formations have been subjected. Their general position 

 is nearly vertical ; and had a similar section been made from the Brocken to 

 the country north of Neustadt, the same secondary series would have been seen in 

 a completely reversed order, and appearing, as we have before stated, to dip 

 under the old rocks of the central Hartz. 



The rocks nearly in contact with the granite at both ends of the section are indurated and greatly 

 altered in structure, and partially penetrated by granitic veins. A remarkable saline spring nearly marks 

 the junction of the slaty rocks and the granite on the south side of the Rosstrappe. 



We mounted to the line of our section from Wernigerode, through beds of grauwacke interrupted 

 by many points and ridges of trap. Near the top of the ascent (a little to the north of Elbingerode) we 

 crossed some courses of dark-coloured limestone with white veins, and associated with projecting bosses 

 of trap. To the N.W. of this point are bands of ferriferous limestone alternating with beds of porphyry, 



* The following fossils, from the neighbourhood of Goslar, are in the printed lists communicated to us 

 by M. Zincken : — 



Goniatites primordialis, JBiich and Schloth. 



simplex, Such. 



Bellerophon nodulosus, Goldf. 

 Pecten Oceani, Goldf. 

 Calceola sandalina, Lam. 



Delthyris macroptera, Goldf. 



laevicosta, Goldf. 



Cyathocrinites pinnatus, Goldf. 

 Favosites polymorpha, Goldf. 



It is, however, obvious that in this list the fossils of the upper and lower parts of our section are 

 confounded together. 



