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OF THE PAPAL STATES. 



257 



trict rest conformably on, and are interstratified with the 

 shelly marls of the Subapennine Hills, the fossils of which 

 have a specific agreement with those of the Suffolk crag of 



this country. ° 



i it appears that the volcanic rocks in question are 

 of submarine origin, and that they were formed by erup- 

 tions which took place during the period when the strata 

 forming the Subapennine Hills were in the course of depo- 



Iienc 



sition. 



) 



l._ Volcanic bomb of scoriaceous lava, from the beds 



near the Villa Falconieri, above Frascati. 



2.— Fine-grained marly tufa, beyond Sta. Agnese, 3 

 miles from Rome. 



3— Tufa, composed of minute fragments of earthy leucite 

 mica, augite, &c, beyond Sta. Agnese, 3 miles from the 

 Porto Piafuori at Rome. 



4. 



/< 



the end of the road from Ponte Porphio to Frascati. 



■From 



5. 



7. 



Tufa, with yellow decomposed pumice, augite, leucite, 

 and a few small scales of mica, forming erratic blocks scat- 

 tered over the Aventine and Esquiline Mounts inside Rome. 

 6.— Rrick-red tufa, with fragments of grey lava, leucite, 

 augite, and calc spar, forming a great deposit beyond Sta. 

 Agnese. 



Grey tufa, composed of minute fragments of lava, 

 leucite, augite, and mica, forming a great deposit on the 

 Capitoline Mount, inside Rome. 



Tufa, composed of fragments of augite, mica, and 

 earthy leucite, with lava, decomposed pumice, &c, from the 

 prolongation of Monte Esquilino, beyond Porto San Gio- 

 vanni, 3 miles from Rome. 



Brick-red tufa, from the Aventine Mount. Pre- 

 sented by Warington W. Smyth, F.G.S. 



' " Tufa, with fragments of lava, augite, mica, calc 

 spar, &c, forming the nucleus of the Capitoline Hill. 



8. 



9. 



10. 



I 



UppfiK 



Galt,ekt. 



Table-case 

 in Recess 6. 



