12 



P. T. CL EVE, 



composed of feldspar and hornblend. They are intersected by numerous veins of quartz 

 or pegmatite, semetimes containing some copper-minerals In the centre of the islet is a 

 mäss of gray crystaline limestone or marble. 



Coopers Island. The geological structure of 



this little island is very intricate. In the northern 



U , part there is diorite with numerous dikes of dia- 



P^S- base and of granular granite. The rock is also 



'X. \_ ~ O 



4 intersected by veins of carbonate of iron. On the 

 H eastern coast south of the diorite mäss, are me- 

 tamorphic rocks containing garnet, epidote, wolla- 

 stonite and numerous veins of white quartz with 

 copper-minerals. That rock is intersected by a 

 large dike of granular granite, and south of that 

 dike are dark, metamorphic rocks in strata, stri- 

 king S. S. E. — N. N. W. and dipping W. S. W. 

 about 70°. On the north-western shore of the is- 

 land there is diorite. In the middle part are 

 sketch form the shore of Ginger Island to show the contact strongly raised metamorphic rocks interrupted by 



between the diorite and the stratified rocks. ,. . ,, , . r , .. , . ,. 



The darker bands are stratified diorite (feldspathic-amphibo- diorite ol a beailtllul parallelopipedlC StrilCture. 



litic flagstones). The dotted space is occupied by unstratified ^ intersected from N— S. by a dike 



diorite. J 



of felsite or granular granite. In the south-eastern point of the island I have seen black, 

 not stratified rocks, containing some epidote and enclosing a dike of granular granite or felsite. 



Stratified metaiinu'- 



phic rocks. 

 Granalar granite. 

 Diorite. 



Sketch of Cooper's Island fr. W. S. W. 



Salt Island. 



The middle of the northern 

 coast is coniposed of diorite alternating in 

 rejjular beds with mica-and hornhlend-schists. 

 East and west of the diorite are amphibolitic 

 and micaceous schists, sonietimes intersected 

 by quartz viens. The strata strike E. N. E. 

 — W. S. W. and dip 45° southward. The 

 southern part of the island projects in a long 

 and narrow promontory, formed by a mäss 

 of granular granite or felsite. 



Dead-maris chest is a small cay, looking 

 at a distance like a coffin, which has proba- 

 bly given rise to the name. The rocks eom- 



Sketch of a 



seacliff on 

 c felsite, 



Salt Id. a 

 d vein with 



amphibolitic schist, b diorite, 

 carbonate of iron. 



