wy 
Dr. Daubeny on ihe Geology of Sreily. eat = 
the comparative ease with which it might be worked, it v 
probably’ preferred for buildings in which the bulk of 
materials, and the solidity of the structure, were the points 
oe considered. 
r Mareola and Sciacca, I observed in th’ rock, certain 
sphenedl concretions, arising from the clusters of irregular 
tubiform bodies, diverging from a common centre. now 
not whether they are organic. 
This recent breccia is ‘seen to rest upon a. formation of 
quite a different nature. The sper positon I first observed 
near the road between Mazzara and Castelvetrano, where 
the former rock is seen resting on a Edleadeonl marl, devoid 
of shells, but replete with selenites. As we proceed south- 
wards, the gradual rise of this stratum brings more feeds 
to view the subjacent rock, which at ae is seen at the 
level of the sea, whilst the breccia appears on the height: 
re where the town itself i is situate. The. same thing 
Ferets : ae 
1 
country, where all the most elevated ore are crowned with 
a similar loose shelly stratum, partly calcareous, partly are- 
naceous, aways resting upon blue clay, and always full of . 
petrifaction 
Thus the ‘Rights of Seat ate (according to Ferrara, 
480 toises, or 2880 feet above the sea,) which overlook the 
valley of Enna, so celebrated in’ the mythology of the an- 
cients, and the fabled résort of their gods, are a ne of 
this rock, resting upon a white calcareous stra without 
ps thernadiigt) with beds of marl, and ‘this "iba i ihe blue 
ay which constitutes the bulk of the subjacent rock. 
in addition to the preceding genera of shells, the sandstone 
contains specimens of the conus, buccinum, trochus, turbe, 
and m an 
Im own, that some farther examination ‘may. be re- 
jase wt to Fanablich the identity of the breccia found upon the 
hills in the interior of the island, with that on the coast be- 
tween Trepani and Selinus; but as I have scen the latter 
resting near Mazzara, on a rock decidedly the same with 
that on Which the former is incumbent, and as the Sani 
of the rock, as well as its imbedded fossils, appear to coin- 
cide, I think myself warranted, for the present, in Seung 
ae the one as a SonGaaaton of the other. 
. X:—No 
