CHAPTER I. 



SUMMARISED ACCOUNT OF THE METAMORPHIC ROCKS FOUND IN SITU 



IN ADELIE LAND. 



In all the outcrops in Adelie Land accessible to us, varying types of crystalline 

 schists have been found. The chief types may be enumerated as follows : 



Locality. Crystalline Schist. Pre-existing Rock Type. 



Cape Hunter Phyllite Clay sediment 



Cape Denison Granodiorite gneiss Granodiorite 



Aplite gneisses Aplites 



Amphibolite series Dolerites 



Gt. Mackellar Is. . . Granite gneiss Granite 



Amphibolite Dolerite 



Madigan Nunatak . Plagioclase pyroxene gneiss Dolerite 



Hypersthene alkali felspar gneiss Granite 



Aurora Peak Hornblende plagioclase pyroxene Dolerite 



gneiss 



Garnet hypersthene alkali felspar Granodiorite 



gneiss 



Cape Gray Plagioclase pyroxene gneiss Dolerite 



Garnet cordierite gneiss Clay sediment 



Garnet Point Amphibolite Dolerite 



Cyanite biotite gneiss Clay sediment 



Garnet felspar gneiss Sediment (probably) 



Stillwell Island . . . Plagioclase pyroxene gneisses . . . Dolerite 



Amphibolites Dolerite 



Acid hypersthene gneisses Granitic veins and 



diorite 



Garnet felspar gneiss Sediment (probably) 



Cape Pigeon Rocks Amphibolites, etc Dolerite 



Garnet gneisses Sediment (probably) 



Garnet hypersthene biotite gneiss Diorite (?) 



In all cases except Cape Hunter there are two main rock types an acid type and 

 a basic type. The basic type represents the metamorphic equivalent of a basic igneous 

 rock that has intruded the granitic rock or the sedimentary rock before the metamor- 

 phism. In all cases the primary dyke origin of the basic type has been established with 

 certainty. 



At the most westerly area, Cape Hunter, there is an old sedimentary series, now 

 represented by a phyllite. Nine miles east of Cape Hunter lies the granodiorite gneiss of 



