200 PETROLOGY OF SOME LIMESTONES FROM THE ANTARCTIC 



Figure 3. — No. 107. x 29. Limestone, Farthest South, December 20, 1908. (In situ.) 



A non-dolomitised limestone with irregular bands of insoluble material in- 

 cluding a pale greenish micaceous mineral. These bands maybe detrital in origin 

 or may be pyroclastic. 



Figure 4. — No. 107. x 83. Limestone, Farthest South, December 20, 1908. (In situ.) 



The same as Figure 3, but more highly magnified and showing better the nature 

 and arrangement of the band of greenish insoluble material. 



All the negatives were taken by Mr. H. J. Grayson, and in ordinary light. 



