Environs of Nice, and the Coast thence to Vintimiglia. 175 



jusqu'ji la base de la montagne, en decrivant des diagonales qui se joignent ii 

 d'autres filons et torment diverses ramifications qui atteignent les collines en- 

 vironnantes/' Perhaps the breccia vein here described is now covered up, at 

 least I was not fortunate enough to find it. 



Another vein (not osseous) traverses the light-coloured limestone and dolo- 

 mite on the east of the lighthouse : it has a reddish cement, contains marine 

 shells, and is so hard as to protrude beyond the rocks in which it lies, and 

 which have been removed by the united action of the sea and air. 



Similar veins (not osseous) occur in the arenaceous limestones of the 

 peninsula of St. Hospice : the cement is not red, but generally sandy. One vein 

 in particular traverses the low hill on which are the remains of the old works 

 erected by the Saracens. Faujas St. Pond notices tiie breccia on Mont Alban : 

 it has a red cement like that which envelops the bones at the Chateau de 

 Nice, but it here envelops fragments of the rocks immediately subjacent. He 

 thought that the grey breccia of the same mountain lay over the red ; but it 

 seems to me that the whole belongs to the same epoch, notwithstanding the 

 difference of colour and the greater or less angularity of the fragments. 



Veins occur in the marly, sandy limestones of Beaulieu, the cement of which 

 is more argillaceous, and the fragments derived apparently from the rocks 

 which inclose them : similar veins are seen in the hill of marly limestone that 

 bounds the eastern entrance of the valley of St. Andre^ and its junction with 

 that of the Paglion. 



Other veins of the same nature, one in particular very large, traverse the 

 arenaceous limestone on the east of Mont Gros, on the road to Genoa ; and 

 an attentive examination along the coast, or in the interior, would probably 

 bring to light many more than are here enumerated. 



I. Superior or Tertiary Rocks. 

 These form a considerable tract of country to the west and north-west of 

 Nice*, and admit of the following division. 



1. Sand, sandstone, and conglomerate of rolled pebbles. 



2. Blue marl, — shell-marl. 



3. Grey marl, calcareous grit, and breccia. 



1. Sand, Sandstones , and Conglomerate of rolled pebbles {alluvial gravel 



of Allan). 

 These strata constitute most of the hills on the west and north-west of the 

 town*, being a part of the tertiary rocks described by M. Risso, as extending 



* xMap, Plate XXI. 



