TRANSLATIONS AND NOTICES 



OF 



GEOLOGICAL MEMOIRS. 



On the Coal-pits of S. Pedeo da Cova, in the Coxcelho de Goxdo- 

 mae, District of Opoeto. By Senhor Caelos Ribeieo. 



[Die Steinkohlen-Grube von S. Pedro da Cova im Concelho de Gondomar, 

 Distrikt von Porto, von Herrn Carlos Ribeiro. Aus dem Portugiesischen 

 iibersetzt und bevorwortet von Herrn W. Reiss.* Neues Jahrbuch fiir Min. 

 u. s. w. Jahrgang 1862. Drittes Heft, pp. 257, &c.] 



Peoceedi^g from the granite of Oporto beyond S. Pedro da Cova, 

 towards the east, the following systems of beds appear succes- 

 sively : — 



1. Gneiss, alternating with mica-schist, extending laterally from 

 Campanha to the neighbourhood of the Serra de Fanzeres. The strike 

 is from N. 10°-20° W. to S. 10°-20° E., and the dip is very rapid 

 towards E. 20° N. 



2. Greyish-green, silky-looking slate, and clay-slate of various 

 colours, having the same inclination as the preceding system. 



3. Breccia made up of fragments of the before-mentioned rocks ; black 

 clay-slate with impressions of Plants ; sandstone ; and coal-beds. All 

 these beds strike from N. 20° W. to S. 20° E., and dip E. 20° N. 



4. Quartzite, clay-slate, and nnfossiliferous greywacke, overlying 

 the foregoing systems. They have a strong inclination towards 

 E. 20° N., while further eastward they dip W. 20° N., or also E. 20° N. 

 Upon them, in fact, rests conformably clay-slate with Trilobites and 

 other fossils of the Lower Silurian formation. 



5. Quartzite, greywacke, clay-slate, and metamorphic rocks ; they 

 are all destitute of fossils, and extend from the left bank of the Ribeiro 

 da Murta over the Serra de Vallongo as far as the granite of Baltar 

 (which strikes from N. 20° W. to S. 20° E.), thus taking in a breadth 

 of from 9 to 10 kilometres. 



* On November 29, 1848, the late Mr. D. Sharpe read before the Society a 

 paper " On the Geology of the Neighbourhood of Oporto, including the Silurian 

 Coal and Slates of Vallongo " (Quart. Journ. Geol. Soc. vol. v. pp. 142, &e.) ; and 

 on April 6, 1853, he read a paper " On the Carboniferous and Silurian Forma- 

 tions of the Neighbourhood ofBussaco, in Portugal" (Quart. Journ. Geol. Soc. 

 vol. ix. pp. 135, &c.), compiled from letters received from Senhor C. Ribeiro in 

 November 1850 and during some months afterwards ; and in this latter paper 

 he stated (at p. 142) that Senhor C. Ribeiro's views of the geological relations of 

 the Coal of Vallongo then coincided with his own. The memoir of which an 

 abridgement is now given appeared in the ' Neues Jahrbuch,' as a German trans- 

 lation of the first part of one published in Portugal by Senhor C. Ribeiro, on the 

 Coal-bearing beds of Oporto, in 1853, and again republished, with other essays, 

 under a general title, " Memorias sobre as minas de carvao dos districtos do 

 Porto e Coimbra e de carvao e ferro do districto de Leiria, por Carlos Ribeiro " 

 (Mem. Acad. Real das Sciencias de Lisboa, vol. i. part 2, 1858), in 1858, from 

 which it appears that, in 1853, Senhor Ribeiro no longer agreed with Mr. Sharpe's 

 views with respect to the age of the Coal in question. 



VOL. xrx. — paet n. c 



