After the end of the Carboniferous period, an intrusion of quartz dolerite formed the Whin Sill.
2.
Julgoldite has since been discovered in other parts of the world : Edinburgh, Scotland ( in quartz dolerite ) ( Livingstone, 1976 ) and Norilsk, Taymyr Peninsula, Russia, one of the largest nickel deposits in the world, in metamorphosed basalts and diabases associated with prehnite and laumontite ( Zolotukin et al ., 1965 ).
3.
Natural England states that " " the great importance of the area lies in its rich variety of habitats and associated plant and animal species " " and that " " geologically there are important exposures of the Great Whin Sill quartz dolerite " " . the condition of 93 % of the SSSI is designated " " Unfavourable Recovering " " and less than 5 % is " " Favourable " ".
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