386 DISCOVERY REPORTS 



shadows and granulation, fragments of quartz mica schist or phylUte, of dense felsite, 

 spheruhtic felsite and rhyolite with phenocrysts of soda felspar (oligoclase) in a quartzo- 

 alkali felspar ground mass and fragments of quartzo-felspathic grit or greywacke like 

 that of Michelsen Island. Vein quartz is, however, the dominant pebbly constituent. 



The remaining specimens are grey fine-grained to gritty greywackes veined by quartz, 

 whose constituents varying in grain size from j to | mm. in diameter are quartz (strained 

 of vein type) albite, frequently sericitized and often multiple twinned, less commonly 

 shale fragments and shreds of detrital muscovite and biotite, grains of epidote and a few 

 fragments of spheruhtic felsite. The majority of these components of the grit are angular 

 and packed together with a minimum of siliceous matrix or are bounded by shreds of 

 detrital biotite and muscovite. 



From a scree slope at the northern collecting point on Fredriksen Island a grey-black 

 flag with conspicuous white mica on the lamination planes is recorded, and a gritty 

 shale appears among the collection at the southern landing point. 



Station 1091: Larsen Island and Sandefjord Bay, 

 Coronation Island 



Rocks collected at this station include leaden grey phyllitic types knotted and veined 

 by quartz along the foliation planes. On the phyllitic surfaces of a number of these 

 bronze-brown biotite is distinguishable. 



Rocks of this type come from the north and south-east face of Larsen Island, from 

 the islet in the strait between Larsen Island, and the mainland of Coronation Island in 

 Sandefjord Bay. 



In section they are seen to consist of muscovite chlorite biotite layers often darkened 

 by carbonaceous matter interposed between areas rich in quartz showing strain shadows. 

 Interspersed among the quartz grains which form part of the vein system intersecting 

 the argillaceous layers are grains of albite. The muscovite chlorite films of the phyllite 

 often enclose numerous grains of epidote, while brown biotite is conspicuous in 

 association with muscovite. 



Collectively the rocks at this station are low-grade quartz muscovite chlorite biotite 

 phyllites intimately penetrated by quartz veins and lenticles carrying albite. 



Station 1092: Rocks of Signy Island 



The specimens collected from this island comprise a varied group of metamorphic 

 rocks of sedimentary origin. ^ They include a group of marbles, garnet hornblende 

 schists, garnet hornblende biotite schists, and a series of quartzose mica schists often 

 garnet bearing — which are recorded as the common rocks of the island where visited. 



I. The marbles occur both on the east and west side of the northern part of the 

 island, at sea-level and at 400 ft. (on east side) and at 150 ft. on the western coast. They 



1 Holtedahl {Skr. tiorske Videiisk. Akad., No. 3, p. 99, 1929) first recorded the presence of metamorphic 

 rocks on Signy Island, from specimens brought to Norway by Capt. Berntsen. 



