216 Mr. Bubble's Synopsis of the Newcastle Coal Field. 



members of the Society who have volunteered to lend their assistance 

 iu the construction of a Geological Map of the northern part of the 

 kingdom, comprising the counties of Northumberland, Durham, and 

 Cumberland, and that it may tend to direct the attention of all to this 

 important object, who may feel interested in its accomplishment, and 

 thus to induce them to lend their aid in promoting its completion, by 

 pecuniary subscriptions and donations, or by communicating information. 



I have endeavoured to illustrate the irregularity and changes in the 

 different seams of Coal, and the leading features of the strata, together 

 with several Slip Dykes and dislocations, as they have been proved in 

 different parts of the district by a set of sections which accompany this 

 paper. 



The Table shews the variation in the distances between the several 

 seams in different places ; also, where two or more of them become 

 united or separate — likewise, where some of them are wanting, or have 

 not been deposited. And I have thought it best to divide the Field 

 into four principal districts, and five divisions, as below, and which will 

 be better understood by referring to the accompanying Map, Plate XX., 

 and more detailed description of the several seams included in the Table. 



RIVER TYNE. 



East of the Meridian of Newcastle Newcastle Division, coloured pink. 



-iiT i pix. nT -J- c-K-\ ^1 f Tanfield Division, coloured blue. 



West of the Meridian of Newcastle j Ryton Division, coloured buff. 



RIVER WEAR. 



East of the Meridian of Chester-le-Street Houghton-le-Spring Divison, coloured green. 



West of the Meridian of Chester-le-Street.. ..Pelton and Beamish Division, coloured yellow. 



The depths from the surface, and the distances between the several 

 seams as stated in the Table, are not generally taken from the actual 

 admeasurement of any particular colliery or pit, but are an approxima- 

 tion of the medium depths and distances in the centrical part of each 

 district or division. The general Sections of the Strata illustrate, as 

 far as they go, the distances, inclination, bendings, and throws of the 

 several seams ; together with their relative depths and heights, below 

 and above the sea level high water mark. 



