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404 MINERALOGY- [APF. N" I. 
Remarks —The form of this island, as represented in the 
drawing, is so differeht from that of Jameson’s Land, and 
the coast about Cape Lister, &c. as to lead to the conclu¬ 
sion that its geognostical composition must be different, 
and consequently containing neither the coal formation 
in its most frequent form, nor primitive rocks. This in¬ 
ference is justified by an appeal to the rocks in this list, 
which are of the Secondary Trap and Porphyry formations. 
The secondary trap-rocks above enumerated are green¬ 
stone, compact felspar, more or less tinged with augite or 
hornblende. No basalt, nor tuffa, nor amygdaloid, were 
met with. The porphyry rocks arc the usual varieties with 
basis of claystone or felspar, and these, like the green¬ 
stone, contained disseminated iron-pyrites. These two 
sets of rocks were arranged together, but in what order 
could not be determined, from want of time. The slate- 
clay, and slate-clay inclining to bituminous shale, and sand¬ 
stone, like the traps and porphyries, also contain iron- 
pyrites. The whole may be a portion of the coal formation, 
in which, as on the coast of Jb’ifeshire, and other parts of 
Scotland, the trap-rocks are predominant, while the sand¬ 
stone, slate-clay, bituminous-shale, fire, are so inconsider¬ 
able in quantity, as to be very subordinate to them, and 
to contribute very little to the general features of the 
physiognomy of the country. Or it may be that these 
trap and porphyry rocks are connected with some of the 
newer sandstones. The fact of tire whole of the members 
of this series of rocks, viz. the greenstone, porphyry, slate, 
and sandstone being impregnated with the same iron-py¬ 
rites, would seem to point out a similar mode of formation 
to the whole,—a conjecture in opposition to that opinion. 
