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MESSRS. KIRKBY AND DUFF ON THE 



and shale more or less affected by heat. Old abandoned quarry 

 holes, where the whinstone has been formerly wrought, are seen 

 close to the farm house at Wooley Hill. The course of the dyke 

 is slightly N. of W. 



About three miles to the east, at Diamond Pit, the dyke has 

 been driven through twice and found to be not more than six 

 feet in width. In another part of the same colliery it is said to 

 cease as a whinstone dyke, and to exist only as a dislocation. 



On the south bank of the Gaunless, near Haggerleases Lane, 

 the dyke is exposed in a township quarry, its width being about 

 ten yards. Near here it divides into two parts, with a mass of 

 shale between. 



On Cockfield Fell the dyke has been most extensively wrought 

 for road-metal, the remains of the ancient fosse-like excavation 

 marking its west-north-westerly course for a considerable dis- 

 tance across the fell. It varies in width, but averages about 

 twenty yards, with thirty or forty yards of bad coal and cinder 

 on each side where it cuts one of the seams of coal. 



Near the eastern extremity of the fell the dyke is crossed by 

 a fault, called the " Doghole Dyke," running S.S.W. This fault 

 not only severs the dyke, but throws the western portion about 

 its width to the south as depicted below. It may be this per- 

 haps that has led more than one author to describe the strata 



Fig. 19. — Flan showing displacement of Cockfield Dyke by the Doghole Fault on 

 Cockfield Fell. 



on the south side of the dyke as upthrown eighteen feet above 

 those on the north, whereas no such faulting of the strata oc- 

 curs. This has been clearly shown by pit workings which have 



