142 



VOLCANIC ROCKS 



Upper 

 Gallery 



Wall-case 1. 



Rock specimens from the Taurus Mounta 



ins. 



116— Felspatiiic porphyry, tilting the slates around 



Kieban 



of 



117— Green serpentine, from the neighbourhood 

 ochreous Breccia, Argana Maden. 



Porphyritic rock, with calc spar, and occurring 



118. 



) 



West 



at Argana Maden. 



^ 119— Altered marly shale, capping hills of serpen- 

 tine at Argana Maden. 



^ 119 a.— Reddish-brown limestone, altered by the intru- 



( 



Maden 



120.— Reddish-brown altered marly slate, capping 

 hills of serpentine at Argana Maden. 



121.— Limestone, altered by serpentine ; from Argana 

 Maden. 



Volcanic specimens from the extinct Volcanos of the Eifel 



on the Lower Rhine. 

 Presented by Poulett Scrope, Esq. 



New 



The volcanos of the 



Eifel are of a date coeval with that of the " brown coal" 

 of the Germans, which has been variously referred to the 

 close of the Eocene, or, to the commencement of the Mio- 

 cene epochs. ' 



" The fundamental rocks of the district are grey and red 

 sandstones and shales, with some associated limestones, 

 replete with fossils of the Devonian or Old Red Sandstone 

 group. The volcanos broke out in the midst of these in- 

 clined strata, and when the present systems of hills and 

 valleys had already been formed. The eruptions occurred 

 sometimes at the bottom of deep valleys, sometimes on the 

 summit of hills, and frequently on intervening platforms. 

 In travelling through this district we often fall upon them 

 most unexpectedly, and may find ourselves on the very edge 

 of a crater before we had been led to suspect that we were 



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