| 
Quaternary а. Moraines and alluvium. 
| Plutonic rocks (granite, nepheline-syenite, etc.) 
Devonian ..- sesso. | and volcanic sheets. 
| Red Sandstone. 
| 
Algonkian (?)........... | Plutonic rocks (granite, diorite, etc.). 
| Arsuk group. 
Årchæani A Re re | Gneisses and crystalline schists. 
The areal distribution of the rock-formation is given in 
the geological map, Plate I. 
Archean rocks are the most widely distributed rocks in 
South Greenland, but in the country around Julianehaab they 
are of minor importance. Only in the north-easternmost part 
of the area which we shall here consider more particularly 
(Plate II) there occurs a gneiss or a foliated granite which 
probably belongs to the Archean period. 
The Arsuk group covers only a small area situated about 
150 kilometers W.N. W. of Julianehaab. Since it has no direct 
connection with the subject of the present paper a brief enu- 
meration of the main rocks will suffice in this place. It con- 
sists of a succession of intensely folded slates, phyllites, dolo- 
mites, quartzites, graphite-schists, and metamorphosed diabases 
and tuffs. They may probably be correlated with the late-Al- 
gonkian (Keeweenawan) rocks of Labrador. 
The country around Julianehaab consists almost exclusively 
of rocks which belong to the four upper divisions mentioned in 
the above table, viz. Algonkian granite (Julianehaab granite), 
— 
This map has been constructed on the basis of the reports and the geo- 
logical maps published by T. Евевтлх (Meddelelser om Grønland, IX), 
A. JESSEN (ibidem, XVI), P. SyLow (ibid., VI), and К. J. У. Srrensrrur 
ibid., II), and has been supplemented and corrected by means of the in- 
formation obtained from an examination of the collections of rocks from 
South Greenland, in the Mineralogical Museum in Copenhagen. With regard 
to the stretch of coast between Arsuk and Julianehaab additional in- 
formation was obtained by the author's journeys in 1900 and 1908. 
