440 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 4, 



ern end of the old rocks of the Harz. We have merely to pass from 

 the Lauthenthal a few miles to the N.N.W., when, instead of the 

 nodular ealcareo-schists we have just spoken of as Upper Devonian, 

 we find ourselves at the feet of enormous masses of amorphous 

 crystalline limestone, void of all alternating schists, which stand 

 out from the dense woodlands to the north of the village of Grund. 

 The chief of these is the pyramidal boss called the Hiibigenstein. 

 In these altered amorphous masses it is almost impossible to trace 

 stratigraphical relations among the fragments. (See fig. 8.) 



Fig. 8. — Section from near Clausthal to beyond Hiibigenstein. 

 Distance about 7 miles. 



S.E. . g . N.W. 



Near Clausthal. 



& 



(Woodlands and (Unknown.) 



slopes covered 

 with debris.) 



Permian i^' Zechstein and Gypsum, 

 i-ermian. <^ j. Rothe-todte-liegende. 



Culm sandstone and schists. 

 Lower Carboniferous.'^ d. Sandstones (Millstone-grit?). 



\^c. Carboniferous limestone and schists. Kieselschiefer, &c. 



{b. Place of the Upper Devonian. 

 a, Stringocephalus-limestone, ^ith iron ore ; much altered and forming 

 mural masses of marble (Htibigenstein). 



Analogically, however, and by comparing them with the rocks of 

 Elbingerode, something may be inferred. In the first place, we see 

 that on its western side, the chief boss of limestone is flanked by 

 highly ferruginous red schists, succeeded by vertical bands of iron- 

 stone, which, if not absolutely in, are clearly associated with Devonian 

 limestone containing corals and exposing traces of beds plunging 

 rapidly at 45° to the S.E. Passing over these you come to the great 

 fissured abnormal masses of limestone (Hiibigenstein), on one of 

 which a cross is placed, and in which all traces of stratification dis- 

 appear. When, however, we know that the Stringocephalus Burtini, 

 Spirifer multirugata, Terebratula reticularis, Pentamerus galeatus ?, 

 with Trilobites of the genera Bronteus and Cheirurus, have been 

 found in or near these rocks, there can be little hesitation in saying 

 that we have in them representatives of the Eifel limestone. 



Whether the eastern peak of the Hiibigenstein belongs to the 

 lower or upper Devonian limestone, it would be difficult to determine 

 from its altered and crystalline aspect ; but numerous fossils charac- 

 teristic of the latter are found in the debris of the adjacent wood- 

 lands on the east, which belong unequivocally to the higher rock, 

 such as Terebratula cuboides and its associates. 



Transition from Devonian to Carboniferous. — We have a still 

 better palseontological proof of an ascending succession in the same 



