44 Introduction 



in Fetlar ; also near Fedaland, west side of 

 Northmaven, and in Foula associated with 

 gneiss and granite. 



Clay slate. A long chain extends from 

 Laxfirth south to Fitful Head, forming nearly 

 all the western side of the Mainland south 

 of Scalloway. 



Primitive sandstone. Forms most of 

 Foula ; occurs in Bressay, Mousa, and other 

 east coast localities. Secondary sandstone 

 runs from Sumburgh Head to the north of 

 Lerwick, and it is joined by clay slate on 

 the west, and rests partially on quartz and 

 mica slate. 



Diallage. Associated with serpentine on 

 the east of Unst and in Fetlar, and forms 

 north point of Northmaven. 



Serpentine. Unst, Fetlar, Northmaven. 



Primitive limestone. Large strata found 

 through Shetland, associated with gneiss, 

 quartz and sandstone. 



