n 







> 



ta 







t 





: 



* erais 



U 



nice 







ceur n 

 ill pro- 



e of tie 

 eat 



lan the 



adstone 

 Miocene 



in the 



[ triad 





long 



j 



: 



Bor- 

 the 



j 



.re 



ie. 

 ire 



1 



Ch. X.] 



UPPEE MIOCENE PEKIOD. 



207 



On this occasion I satisfied myself that Signor Gastaldi 

 was right in supposing that the large blocks //, lying on 

 the surface of the hills, had been washed out of the beds 



Fig. 8. 



Alps. 



Hill of Superga, 



» 



I 



i 



i 



*3S3&*«3 



Section from the Alps to the Hill of the Superga, showing the position of 



the Miocene erratic blocks. 



a. 



b. 



c. 



d. 

 e. 



f, 



N.B. 



Conglomerates of Miocene age with large blocks. 



Marine sub-Apennine or Pliocene strata. 



Diluvium or ancient alluvium of various ages, some of it below tlie 



moraine d. 

 Moraine of Ivrea of the Glacial period with erratic blocks. 

 Erratic blocks lying on the moraine d. 

 Miocene blocks washed out of the conglomerate a, and scattered over the 



hills of the Superga chain. 

 The distance from the Alps to the Hill of Turin is about thirty miles. 



■K- 



a a, by the same action which has hollowed out the valleys. 

 In other words, they have not been brought from a distance, 

 as was once supposed, during the more modern or Post- 

 pliocene Glacial period, like the erratics e, which rest on 

 the moraine <i, but have been washed out of the Miocene 

 beds in the immediate neighbourhood, viz., the conglomerate 

 a. This last is part of a regular series of strata, chiefly of sand 

 of various degrees of coarseness, and of gravel, in which are 

 rolled pebbles of greenstone (or diorite) limestone, porphyry, 

 and some other rocks. Among them we occasionally meet 

 with fragments of enormous size, composed of serpentine and 

 greenstone, one of which I ascertained by measurement to be 

 14 feet in its longest diameter. Signor Gastaldi has seen 

 another in the same formation, 26 feet long ; they are angular, 

 and several of those which I saw exhibited some faint striae and 



* Gastaldi, Sui Conglomerati Mioceni del Piemonte, 1863. 



