Dr, Daubeny on the Geology of Sicily: 231 
The geology of Sicily may, for convenience sake, be di- 
vided into three parts, corresponding nearly with the 
sides a the irene which represents the figure of the island. 
rst division will comprehend the rocks from essina, 
(or Peiier from Peeeany to Trepani, thos taking in 
whole of the northern coast, and a small portion of the 
eastern. 
They will be found to consist chiefly of the primitive, 
transition, and older secondary strata ; the most recent fo ae 
tion, in this part of the island, being the limestone of Palerm 
and Trepani, mee perhaps ‘corresponds with the jeceenel 
limestone of this country. 
The second avisiod embraces the rocks that occur near 
epoch in the history of our planet, namely, that posterior to 
the formation of the chalk. 
e third division, which takes in the line of coast on the 
cast, fron Cape Passero to Taormina, exhibits indications of 
volcanic action, occurring at very different epochs, from the 
Javas which flowed during the period at which the tertia 
beds were in the act of being deposited, to the comparatively 
recent eruptions that have taken place from Mount E 
e physical structure of the more central portions of the 
island need not be entered into at present, as x will be de- 
scribed in the course of this paper, and may be collected 
sufficiently for our present purpose, by an ampecton of the 
accompanying ma 
The plan, then, according to eho I si 
the subject, whilst it corresponds w of the ek 
adopted by travellers, has the oe of Slloeine Sered 
natural order of succession in which the rocks should be con- 
sidered. 
Let us commence, then, with the neighbourhood of Messi- 
na, the only en of the island in which rocks of a granitic 
character occ 
errara, ied, in his Account of Sicily, lays them down 
as consisting of true granite ; and my observations here were 
far too cursory to justify my contradicting him 
I may however remark, that, in the places which I pags” 
he rock seemed to have the characters of Gneiss; and 
tie i is the formation which probably extends on the Ttalian 
