TRANSLATIONS AND NOTICES 



OF 



GEOLOGICAL MEMOIRS. 



DEEEifCE of the '^ Colonies." — Part III. By M. J. Bakeande. 



[Defense des Colonies. — III. Etude generale sur nos etages G-H, avec applica- 

 tion speciale aux environs de Hlubocep, pres Prague. Par J. Barrande 

 1865.] 



This last contribution from the pen of M. Barrande treats specially 

 of the two highest members of his " third fauna," which are well 

 developed in the typical district of Hlubocep, and are subdivided by 

 the author as follows : — 



metres. 



A3. Soft grey and greenish shales 20-40 



h 2. Shales alternating with thin bands of impure sand- 



H \ stone 150-200 



1. Variously coloured highly fossiliferous shales, with 



a few calcareous bands at the base 20-60 



^3. Compacted nodular limestone 50-100 



Qc \ g2. Shales containing thin layers of calcareous nodules 20-150 

 [^1. Beds of nodular Umestone 150-200 



The lowest division of g rests conformably on P, the passage from 

 the one member to the other being gradual. Between g 1 and g 2 

 there nowhere exists any strongly marked line of separation ; on the 

 contrary, the transition takes place by repeated alternations of thin 

 bands of limestone and beds of shale, the former diminishing in 

 thickness as we ascend to higher levels, while the intervening beds of 

 shale become progressively thicker. Towards the central portion of 

 g 2 the nodular limestone bands are reduced to a few subregular 

 layers, or are altogether absent. The passage into the overlying g 3 

 is equally gradual. Thin bands of yellow and red nodular limestone 

 separate the shales towards the highest part of this division, and be- 

 coming more and more numerous as we ascend, finally become pre- 

 dominant, and are succeeded by the compacted nodular hmestone 

 beds g 3. This latter resembles precisely the lower bed g 1, but 

 differs widely in the species and relative number of its organic re- 

 mains. In the vicinity of Chotecz and Hinter Kopanina g 2 con- 

 tains beds of trap -rock interstratified with the shales. 



Between g 3 and h 1 the transition is more marked, although at 

 Hortin and near Holin there is an apparent alternation of the higher 

 beds of the one with the lower beds of the other. In some localities, 

 however, as in the valley of Srbsko, the shales of ^ 1 abut against the 

 higher limestone of G. Nevertheless M. Barrande is unwilling to 

 admit that there exists a real unconformability between the two 



VOL. XXII. PAET II. B 



