236 Mr. Buddle's Synopsis of the Newcastle Coal Field. 



from whence it proceeds with Uttle interruption to the east side of Jar- 

 row Pit, where it falls in with a succession of Slip Dykes, some throwing 

 up and some down, so as to dislocate the strata for a considerable dis- 

 tance as represented on the Section. 



The last Dyke in this succession is an up-throw of 12 fathoms, be- 

 yond which the strata rise to the eastward, and bring the Grindstone 

 Post nearly up to the surface in the new Engine Pit at South Shields, as 

 already described. A little further to the eastward, it is thrown quite 

 out by the 40-fathom upcast Dyke ; and can only be brought in again 

 further to the east, by the renewed dip of the strata in that direction, 

 as represented. 



As the several strata, as well as the seams of Coal, represented in 

 this Section, preserve nearly a parallelism, and are subject to the same 

 inclination and dislocations as the Grindstone Post, the foregoing de- 

 scription of this particular Post, will apply generally to them all, ex- 

 cepting, of course, as to their out-crops. 



The Hebburn Fell Seam crops out to the eastward near the old 

 Engine Pit at South Shields, and to the westward under the diluvium 

 between the B and C Pits in Hebburn. 



The Black Stone, Main Post, and High Main Coal, run through the 

 whole length of the Section, from South Shields, till they crop out in 

 the declivity of the hill on the east side of the Team near SherifF-hill 

 Engine. All the seams of Coal, between the High Main and the 

 Beaumont, also rop cout on the east side of the vale of the Team in this 

 part. 



The haids of the several Slip Dykes, forming the group on the east 

 side of the Jarrow Pit, were ascertained by the driving of two stone 

 drifts, the one immediately below the other, at the distance of 17 

 fathoms. I merely mention this to shew that the angles, at which 

 those Dykes are represented, may be considered as tolerably accurate. 



The only other Dykes of any consequence which occur on this line 

 of Section; are those in Felling and Sheriff-hill Collieries. 



Proceeding along our line to the south-west, from the Venture Pit in 

 Felhng Colliery, we first meet with a l6-fathom downcast. This Dyke 



