THE CONTINENT 



Crystalline limestones, coarse and of a white color, 

 are the most noteworthy of these metamorphics. They 

 occur at Heald Island, where they are eight hundred 

 feet thick, and at Salmon Hill, north of Davis Glacier, 

 they are about five thousand feet thick and dip steeply 

 to the northeast. Another good example occurs near 

 the Suess Glacier in Taylor Valley. Here I ''washed" 

 in a miner's dish the debris at the junction of this 

 limestone with augen-gneiss, in the vain hope that some 

 gold might be present. These limestones are rich in 

 chondrodite ' and spinel. In Granite Harbor Deben- 

 ham also found similar limestones. 



Pyroxene granulites were found included in granite, 

 at Granite Harbor and elsewhere, as erratics all along 

 the west coast of the Ross Sea. Hornblende schists 

 seem to be associated with them. Tilley has described 

 a rock from Eyre's Peninsula in South Australia of 

 similar character which is due to the metamorphism of 

 impure dolomites. A similar origin is likely in Ant- 

 arctica. 



Crystalline Schists. — These occur with a thickness 

 of two thousand feet in Heald Island where muscovite- 

 schists rich in graphite are common. Many other out- 

 crops occur in the Kukri Hills and nearby, where a 

 garnet-sillimanite-schist is common. In places lenticles 

 of biotite amphibolite probably represent metamor- 

 phosed basic dykes. (See Figure 8.) 



Gneisses. — These rocks grade into gray granites in 

 very many localities in South Victoria Land. They 



7 Chondrodite is a fluo-silicate of magnesium, somewhat re- 

 sembling olivine. 



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