26 Mr. N. J. Winch on the Geology of 



the country formerly called Killingworth moor, and passing near 

 Gosforth church, Denton hall, and by the north corner of the 

 field east of W. Denton's house, crosses the Tyne in the direction 

 of Reyton church, and proceeds to the south-west by Greenside 

 and Lead-gate. Farther it has not been traced ; but it is highly 

 probable that it traverses the lead mine district; and produces 

 lateral and valuable metalliferous veins therein. 



It will appear from the two subjoined sections of Montagu 

 Colliery, taken from opposite sides of this fissure, that 1 1 seams of 

 coal (two of which are worth working) together with their accom- 

 panying strata which are found on the northern side, have dis- 

 appeared on the southern. The exact throw in the measures 

 occasioned by the dyke cannot be ascertained from these sec- 

 tions, one of them being that of a pit near to Scott's wood close 

 to the Tyne, the other belonging to a shaft sunk in much higher 

 ground \\ mile north of the fotmer. 



*The hade of the dyke in this colliery is imperceptible: the 

 space between the cheeks measures about 22 yards, and is filled 

 with soft and hard sandstone. A perpendicular fissure, the sides of 

 which are quite smooth, divides the stony contents of the dyke into 

 two equal parts, and when perforated was found to be filled with 

 soft clay and water. On the south side the coal-measures preserve 

 their usual dip of 5° until close to the dyke : on the northern from 

 the distance of 150 yards they rise to the dyke at an angle of 20°, 

 but at the distance of 600 yards they regain their accustomed 

 position. In some parts the coal is deteriorated in quality to the 



* I have extracted these particulars from a memoir on the Montagu colliery, by Mr. 

 Thomas, of Denton, in which are described the dykes and slips met with in the workings 

 of that mine. I am partly indebted to the same gentleman for the information on the 

 direction of the main dyke. 



