Mr. Buddle's Synopsis of the Newcastle Coal Field. 233 



full distance being two miles and three quarters, which is the largest stretch 

 of unbroken strata we know of in the district. Although the Main Post 

 and the other strata run through this large extent without interruption 

 or dislocation, it will be observed, that several important changes have 

 occurred in the thickness and divisions of the Sandstone strata. 



The Main Post gradually thickens from 10 fathoms, at Willington, 

 to 14 at Bigge's Main, while the lower member of the 70-fathom 

 Post, nearly preserves its thickness of 14 fathoms, as far as theD Pit at 

 Wallsend, where it is divided by a thin stratum of Metal Stone. In 

 the east part of Willington we find two thin layers of Sandstone inter- 

 vening between the lower and upper portion of the 70-fathom Post. 

 But these layers disappear before they reach the C Pit at Wallsend, and 

 the lower one seems to re-appear further to the west in the D Pit, and 

 continues to the 9-fathom Dyke. The upper member of the 70-fathom 

 Post thickens from 4 fathoms to 8 in the whole distance, and it seems 

 to be traversed obliquely by a thin seam of Coal, between the D Pit 

 at Wallsend, and the A Pit at Bigge's Main. 



Above the 70 Fathom Post an additional stratum of Sandstone occurs 

 to the west, which commences between the C and D Pits in Wallsend, 

 gradually thickens to 12 fathoms in the Bigge's Main Pit, the distance 

 being about three quarters of a mile. Another thin stratum of Sand- 

 stone puts in above the upper division of the 70-fathom Post between 

 Willington and Wallsend, and preserves a uniform thickness of about 

 2i fathoms, intervening between the above-mentioned in-put Post and 

 the Grindstone Post. These two in-put strata of Sandstone continue re- 

 gularly to their out-crop near the Ouse Burn. 



It will be observed, that the Metal Coal Post disappears at the 18- 

 fathom Dyke, at the Flatworth Pit, and does not again occur till we 

 find it in the Middle Pit at Jesmond, where it forms the pavement of 

 the Coal. But under the Town Moor it is found to have assumed its 

 proper situation above the seam. Proceeding from this 9-fathom down- 

 cast, in Bigge's Main, the strata lie nearly horizontal for about 120 

 yards, when they are thrown up 8 fathoms. Continuing westward 

 into Heaton Colliery, we meet a 9-fathom downcast, and at 250 yards 



