321 



XXII. 



REPORT ON THE ROCK-SPECIMENS 



COLLECTED BY THE 'SOUTHERN CROSS' ANTARCTIC 



EXPEDITION. 



By G. T. PEIOR, M.A., F.G.S., 



Ansistant in the Mineral Department, British Museum. 



(Plate LIU.) 



The collection consists mainly of specimens of scoriaceous and 

 compact hornblende-basalts, pale-green siliceous slates and quartz- 

 grits, and boulders of granitic rocks. According to Mr. Borchgrevink, 

 it is " to a great extent a more complete series of the rocks which he 

 secured at Victoria Land in 1894." That collection, which included 

 basaltic and trachytic rocks from Cape Adare and Possession Island, 

 has been very fully described by Prof. T. W. E. David, W. F. Smeeth, 

 and J. A. Schofield.^ Descriptions of basalts together with granitic 

 and phonolitic rocks from Possession and Franklin Islands have 

 already been given in my " Petrographical Notes on the Rock- 

 Specimens collected in Antarctic Regions during the Voyages of 

 H.M.S. ' Erehm ' and ' Terror ' in 1839-43 (Min. Mag., XII., 

 pp. 69-91). 



The specimens in the present collection for the most part have no 

 locality-labels attached to them, and are accompanied by no lists 

 or geological details as to their mode of occurrence and mutual 

 association in the field. 



The following list of the localities from which they were collected 

 depends partly upon oral statements made by Mr. Borchgrevink, and 

 partly upon a comparison of the rocks with localised specimens 



' ISee ' Notes on Antarctic Kocks collected by Mr. C. ,E. Borchgrevink,' Free. 

 Roy. Soc. N.S.W., XXIX., pp. 461-492, 1895. 



