•94 GEOLOGY. 



Richter, R. Aus dem Thiiringisclieii Schiefcrgebirge. [Thnringian 

 Slates.] Zeitsch. deutsch. geol. Ges. Heft ii. pp. 261-r273 ; wood- 

 cut (section) and plate (fossils). 

 The Upper Silurian slates of the Thiiringer Wald consist of a lower 

 group rich in Oraptolites, divisible into a lower and an upper series, 

 separated by limestone with Cardiola interrupta, &c. (Interruptakalk) ; 

 and of an upper group rich in Tentaculites, divisible into Ctenacanthus- 

 beds, overlain by Nereita-'hediS,, and these by Cancellatus-^laies. Por 

 description of new fossils, see Invertebrate Palaeontology. P. W. E. 



Riviere, E. Sur le depot quaternaire superieur a la breche osseuse 



de Nice proprement dite, ou breche superieure de Cuvier. [The 



Quaternary Deposit above the Osseous Breccia of Nice, or Upper 



Breccia of Cuvier.] Compt. Bend. t. Ixxx. pp. 438-440. 



Thinks that this upper deposit must be regarded as being formed by 



the accumulations of detritus due to Quaternary races similar to those 



found by him at Mentoneand Beaulieu. U. A. L. 



Rocco, Gt. B. [Greek Mines.] N. JaJirh. Heft iv. p. 394. 



Note on a visit to a copper-mine at Argolis. The country-rock is 

 serpentine, with marble ; the ore is copper-pyrites in a gangue of 

 quartz, calcspar, and iron-pyrites. P. W. R. 



Roemer, Prof. Ferd. Ueber die Eisenerzlagerstatten von El Pedroso 

 in der Provinz Sevilla. [Iron ores of El Pedroso, Seville.] Zeitsch. 

 deutsch. geol. Ges. Heft i. pp. 63-69. 

 Describes deposits of iron ore belonging to the " Compaiiia de 

 Minas y Pabrica de hierro del Pedroso." 



. Notiz liber die Grube Gonderbach bei Laasphe im Kreise 



Wittgenstein. [Gonderbach mine.] iV. Jahrh. Heft iv. pp. 378- 

 381. 



Describes the Gonderbach mine, in Prussia, which is worked in 

 Lower Devonian slates. The vein strikes E. 15° to 30° S. (7 to 8 

 o'clock), dips S. 60° to 70°, and varies in width from 6 to 9 lachter. 

 It carries argentiferous galena, pyrargyrite, polybasite, and native 

 silver, with small quantities of fahlerz, copper pyrites, zinc-blende, and 

 siderite. Since 1857 the vein has yielded 38,000 centner of lead ore, 

 570 centner pyrargyrite, and 3J centner of native silver. P. W. R. 



[Spanish Geology.] N. Jahrh. Heft v. pp. 521, 522. 



Letter announcing the discovery by Mr. M'Pherson of evidence of 

 glacial action in the western part of the Sierra Nevada. Refers also to 

 the discovery of serpentine, produced by alteration of olivine rock, in the 

 Serrania de Eonda. [See Geologic vl Record for 1874, ""p. 373.] His 

 observations of hand specimens of these rocks confirm Mr. M'Pherson's 

 conclusions. P. "W. II. 



Roemer, Prof. Ferd. Zeitsch. deutsch. geol. Ges. Bd. xxvii. Heft 3, 



pp. 707, 708. 

 Letter referring to Dr. Dames' paper (see Geological Record for 



