SU.MMARY OF CONTENTS. 



THE VESTANA REGION 



A STUDY IN PETROGENÉSIS 



BY 



HELGE BÄCKSTRÖM. 



The crystalline schists of »the Vestanå region» in north-eastern Skåne (Scania), South- 

 ern Sweden, were studied and mapped in detail for the Geological Survey of Sweden by 

 Gerard De Geer during the years 1884 to 1887. Araong the results attained, the most 

 interesting was the discovery of a conglomerate in a band of muscovite-quarzite, which was 

 considered to be conformably interstratihed between the gneiss formations of the district. ! 

 In 1893 the present writer with the permission of the Director of the Geological Survey 

 and with the kind aid of Dr. De Geer undertook to study the various rocks of the 

 Vestanå region and its neighbourhood, in order to try to work out the geology of a part 

 of the Swedish Archean (or Lower Algonkian) especially from a petrogenetic point of view. 

 The work has been done partly in the field, but chiefly in the laboratory, most of the 

 field work necessary having been done previously by the officers of the Geological »Survey; 

 for the Vestanå region by G. De Geer, 2 for the northern continuation by P. Dusen, 3 for 

 the eastern continuation by N. O. Holst and C. J. O. Kjellström. 4 



According to De Geer the crystalline schists of the Vestanå region form an unin- 

 terrupted series of strata, striking NW — SE and dipping steeply to the west. From the 

 younger to the older schists the sequence is: 



, . . f fine-grained, commonly red 



m ,. i- ^ nne-grained 2'ray gneiss n , , . J . .,, , e A . 



Kuicistorp schists { , . ° J n Di/nchoda qnciss \ gneiss with Jayers ot dio- 



■ l I dionte-schist y y ■+ i • + 



[ rite-schist. 



1 Gerard De Geer >Ueber ein Conglomerat im Urgebirge bei Vestanå in Schonen» (Uebersetzt von 

 F. Wahnschaffe. Zeitschrift d. d. geol. Gesellschaft 1886 p. 269). 



2 Sheets Nos. 103 »Bäckaskog» (1889) and 106 »Karlshamn» (Skåne-part) (1889). 



3 Sheet No. 108 »Glimåkra» (1892). 



4 Sheet »Karlshamn» Blekinge-part. Not yet published. 



