222 



Professor Sedgwick and Mr. Murchison on the 



Description of the rocks composing the Eifel, 

 banks of the Rhine, basin of the Moselle, 

 &c., p. 276. 



The Eifel limestone, p. 276. 

 Shales, red psammites, schists, &c., un- 

 der the Eifel limestone, p. 279. 

 Older slates of the Moselle and the 

 Rhine; formations of the Hundsriick 

 and the Taunus, p. 280. 



PART III. 

 Structure and formations of the Hartz and Upper 

 Franconia, p. 283. 



Hartz. — General structure, p. 283. 



Age of its sedimentary deposits, p. 288. 

 Section from Osterode to Clausthal, 

 p. 288. 



Clausthal to Griind, p. 



288. 

 Section from N.N.W. and S.S.E. or from 



the hills a few miles north of Goslar 

 through Rammelsberg to the granite 

 of Ocker Thai, p. 290. 



Section from the granite of the Brocken 

 through the limestone of Elbingerode, 

 to the granite of the Rosstrappe on 

 the Bode, p. 292. 



the south-eastern extre- 

 mity of the Hartz, p. 294. 

 Description of the stratified rocks expanded 

 from the Thuringerwald through Upper 

 Franconia to the Fichtelgebirge, p. 296. 



Section of the Saal, p. 296. 



fromDachnitztoSaalfield,p.296. 



— of Hof, Elbersreuth, &c., p. 298. 



from Hof and Naila to Gerols- 



griin, p. 299. 



Gerolsgriin to Prusseck, 



p. 299. 

 Conclusion, p. 301. 



Introduction. 



JjEFORE we give to the Society the results of our examination of the older 

 stratified rocks of the Rhenish provinces, the Hartz, and Franconia, it may be well 

 to state, in a few words, the objects we had in view at the commencement of our 

 labours in the early part of last summer. When we entered, during the summer of 

 1836, upon an examination of the structure of North Devon, our sole aim was 

 to determine the position and relations of the culmiferous strata, about which 

 there had been much controversy. Before our task could be completed, we were 

 led to an examination of the lower groups of strata both in North and South 

 Devon, and to follow them in their prolongation into Cornwall ; and we at length 

 arrived at the conclusion, that nearly all the older stratified rocks of both counties 

 belonged to one epoch, and must be included under one common designation. We 

 proposed the name of Devonian system for this great series of deposits, and we 

 placed it in a position intermediate between the lower carboniferous and the upper 

 Silurian groups ; and therefore on the exact parallel of the old red sandstone, of 

 which it was assumed to be the equivalent under a new mineral type*. We need 

 not inform the Society that this classification was strenuously opposed at the time 

 it was first brought forward, and that it has been combated in some public journals 

 since the appearance of our abstracts ; nor do we now deny that it was encumbered 

 with great difficulties. To beheve that a limestone (like that of South Devon) 



* See Geol. Trans., vol. v. p. 633 et seq. 



