214 Proceedings of the Boyal Physical Society. 



Zorger Schiefer, 



3. "Hauptkieselschiefer," 



Obere Wiederschiefer, 



1. " Haupt Quarzit " (base), 



The Lower Harz facies of tlie Lower Devonian has been 

 divided into five sub-groups : ^ 



i Typical tbick-bedded greywacke, with few plants 

 5. ' * Elbingeroder ) developed cbiefly on the E. and S. flanks of 



Grauwacke," . . .1 the anticline. At Ballenstedt, Elbingerode, 

 ( and to N. and E. of Ilfeld. 



Small group of clay slates, like the Wieder- 

 schiefer, often greenish or red like Wetzschiefer. 

 \ Intercalated greywacke and Kieselschiefer 

 I beds, and sheets of diabase. Zorge, and W. 

 (^ of Stiege. 



i Typical black splintery Kieselschiefer, with thin 

 1 beds of clay slate. Stiege, Benueckenstein, 

 1 Lauterberg ; also to N. E, of Harzgerode, and 

 ( on N. side of the Elbingerode basin. 

 rLike the Lower "Wiedersch. At places red and 

 I green variegated ( = Buntschieferzone) ; sheets 

 -{ of diabase and green shale at top. Giinters- 

 I berge, Elbingerode basin, and between 

 L Hettstedt and Breitungen. 

 ( On S. and E. of the anticlinal axis of the Tanner 

 1 gr. , unfossilif., and not calcareous. On N. 

 -{ of axis often fossilif. with fauna of Spiriferen- 

 I sandstein. S. and E. of Harzgerode, Giin- 

 L tersberge, Elbingerode basin. 



(2.) The Middle Devonian of the Upper Harz is repre- 

 sented by (1st) a series of thin argillaceous limestones inter- 

 bedded with shales, which rests on the Spiriferensandstein, 

 and is named the " Calceolaschichten " (Calceola beds), from 

 the abundance of the typical Middle Devonian coral Calceola 

 sandalina which it contains. Ciipressocrinites Urogalli and 

 Spirifer speciosus are also characteristic of the group. Other 

 common fossils are Cyathophylhcm vermiculare, Favosites 

 Goldfussi, Fenestella explanata, and Phacops latifroTis. (2d) 

 The so-caUed " Goslar shales," with few limestone and gxey- 

 wacke beds, developed near Goslar. The most characteristic 

 fossils are : 



Tentaculites coniciis. 

 T. annulatus, etc. 

 Cardiola rctrostriata. 

 Orthoceras multiseptatum. 

 Bactrites carinatus, 

 Acidaspis horrida. 



Goniatites lateseptaivs. 

 G. hicaniculatus. 

 G. retrorsus. 

 G. Jugleri. 

 G. lamed. 

 Phacops latifrons. 



In the Elbingerode basin, on the Lower Harz, the Middle 

 Devonian rocks are represented by the "Stringocephalenkalk " 

 1 hoc. cit., p. 30. 



