OLAF HOLTEDAHL [SEC. ARCT. EXP. FRAM 



Pre-Cambrian. 



Pre-Cambrian rocks were studied by Schei in the following regions: 

 I Foulke Fjord region in Prudhoe Land, Greenland; II In the opposite 

 district in Ellesmere Land viz. on the coast of Buchanan Bay and adjacent 

 regions (near the winter quarters of the n Fram" 1898 99). Ill At the 

 eastern part of Jones Sound, especially at and near Havnefjord, the winter 

 quarters of 18991900. 



The rock specimens brought home by Schei have been microscopically 

 investigated by G. BUGGE, a paper on which, M Petrographische Resultate 

 der 2ten Fram-Expedition", published 1910, is No. 22 of this report. BUGGE 

 has besides studying the specimens from SCHEI'S diaries obtained all the 

 information available on the subject. 



I. From the Foulke Fjord district (Reindeer Point) BUGGE has described 

 a hypersthene-quartz-diorite; also a rock that comes nearer to a banatite; 

 and as the youngest rock in this place, pink-coloured aplitic veins. Finally 

 from Etah a gabbro. Schei has in his diaries also mentioned gneiss and 

 mica schists from the Foulke Fjord region, schists that seem to be older 

 than the igneous rocks mentioned. II. South of Buchanan Bay, 

 also, are found hypersthene-quartz-diorite, together with somewhat younger 

 veins of granite. The difference in age, however, is slight. The granite 

 was probably intruded before the diorite was entirely cooled off. 

 Also a vein of kersantite is seen, at Kjelhaugen in Pirn Island. . From 

 other places near the r Fram's" winter quarters are described broncite- 

 quartz-diorite, quartz-diorite, norite. In the Twin glacier valley district 

 the igneous rocks have certainly found their way through older gneissic 

 material, as they are found to contain large pieces of gneiss. At Cape 

 Gamperdown, at the SE corner of Bache Peninsula, occurs a hypersthene- 

 quartz-potash-syenite. A typical feature in the igneous rocks of the 

 Foulke Fjord and the Buchanan Bay region, is their nearly un pressed 

 condition. III. At Havnefjord and on the coast to the east, similar rocks 

 are found. BUGGE mentions granitic as well as more basic rocks, broncite- 

 adamellite. The first-mentioned rocks are probably the younger. Of diorites 

 scarcely any material was brought from here. The rocks from this southern 

 district are distinctly more pressed, sometimes of a somewhat 

 gneiss-like structure. 



