416 Mr. Hutton's Nates on the New Bed Sandsto?ie of Durham. 



shows the remarkably undulating line each bed takes, by the 

 unequal depression of portions of the strata. I have taken 

 the High Main Coal as the representative of the whole series, 

 from its being best known ; but the continuous line exhibited, 

 although sufficient for our present purpose, is incorrect, as 

 many slips or dykes occur, throwing it down in portions un- 

 equally. 

 East. No. 1. 



Whitley*. Earsdon. Backuiorth. 



lttl * Sea» 2 



n Me North or dip side of the Dyke. 



The amount of" throw" caused by the dyke at the points 

 named in the diagram No. 1, will be nearly as below: — 



At Whitley. Earsdon. Backworth. Under Closing Killingworth Gosforth. Kenton. 



Hill Quarry. West Moor. 

 lOOfaths. 150faths. 160 faths. 140 faths. 175 faths. 170 faths. 120faths. 



The diagram No. 2. represents an ideal section of the strata 

 from Killingworth village southward, through the Closing Hill 

 Quarry. It is a remarkable circumstance that, although the 

 slip, or " throw," is here so enormous, yet, that the derange- 

 ment, arising from the increase of inclination of the strata, 

 extends but a very short distance from the dyke. 



North. No. 2. South. 



Killingworth. Closing Hill. 



Killingworth House, which is, as before stated, about 950 

 yards north of the dyke, is built upon the Grindstone Post, a 

 well-known sandstone bed here at the surface; but, if we 

 wished to find that bed at the dyke, we should have to sink 

 120 fathoms before we reached it. 



The occurrence of the red sandstone, in the situation de- 

 scribed, affords evidence of great value in estimating the cor- 



* The depth at which the High Main Coal is worked in Whitley Col- 

 liery, on the north of the dyke, is, by mistake, stated to be fifty fathoms in 

 the 4th volume of the Geological Transactions, page 25. 



rectness 



