160 Lieut. Baddeley on the geognosy 
pository of large pieces.of brown mica, which are dug out the 
size of the foot from crevices in the rock ; some of it is ex- 
ceedingly contorted. The rarity of mica in most of the rocks 
described in this essay renders this deposite the more deserving 
of attention. 
Having closed our geognostical observations at the foot 
of Cape Tourment, we will now introduce a short recapitulation 
by way of summary which will include some remarks on the 
geological position of the rocks we have described. The rocks 
seen on our journey, were the following :— 
Nos. 1,—Granite. 
2.—Micaceous Schist, (Mica Slate.) 
3.—Quartz rock. 
4,—-Primary limestone ? 
5.—Syenites —including syenitic granite and syenitie 
gneiss. gi 
6.—Trap rocks—or aggregates, in which hornblende pre- 
dominates. 
7.—Felspar rock—(sui generis.) 
8.—Magnetic iron. 
9,—Clay-slate, 
10.—Grey wacke. 
11.—Sandstone. 
12.—Secondary limestone—including the transition of 
some authors. 
Of all the granitic rocks we met with, perhaps that of Cape 
Tourment is the only one, free from an admixture of horn- 
blende ; for although we collected sume specimens elsewhere, 
which appeared to be so, it might very well have. been pre- 
sent, without our being able to detect it, on account of the 
smallness of the grain of those specimens, and the resem- 
blance 
