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



Although the several Dykes, which have been met with in all the 

 working collieries of the present day, are accurately represented on the 

 working plans of these collieries, yet from the detached and local nature 

 of those plans, no general and accurate notion of their lines of direction, 

 bendings, and throws, can be formed from such detached sources of in- 

 formation. Nothing can effect the object of gaining an accurate know- 

 ledge of this important feature in the geological structure of our district, 

 but the construction of a Map of it, laid down from actual survey, on 

 which all the Dykes which have yet been discovered shall be correctly 

 represented. This Map, to be accompanied by a book of Sections, 

 shewing the throws of the Dykes in every part of the district. 



The survey and projection for this Map would serve for the contem- 

 plated Geological Map of the district, or, probably, one map might be 

 made to answer both purposes. And as it would form a valuable record 

 for posterity, I submit that the promotion of such an undertaking is 

 worthy of the most serious and prompt consideration of the Society, as 

 well as of the patronage of the landed and mining proprietors of the 

 country. 



I, therefore, take the liberty to suggest to the immediate considera- 

 tion of the Society, the propriety of requesting the Special Committee 

 to prepare a prospectus, and also a report to be submitted to the Society, 

 as to the best mode of proceeding for the attainment of this desirable 

 object. 



