Mr. N. Wood on the Geology of Northumberland, ^c. 321 



rises west from Talkin towards the brow of the escarpment, from whence 

 it stretches north, until it is cut off by a rise Dyke, and south into Gelts- 

 dale, where the same bed of Coal is worked. 



The following is the sinking at the Blackside Pit, Talkin Colliery : — 



Soil, Clay, &c. 



Plate and Shale, 



Strong Freestone, 



Plate and Shale, 



Freestone, 



Plate and Shale, 



Limestone, 



Plate and strong Shale, 



Freestone, 



Strong grey Plate, 



Coal, 



Along the brow of the escarpment, rising above the Red Sandstone, 

 we find the lower beds of Limestone crop out from underneath the pre- 

 ceding strata and Coal-bed. The face of the escarpment ranging south- 

 west, and the line of direction of the strata being south, as we proceed 

 southward along the line, we get lower down in the series, or find the 

 lower beds i-egularly rising to the surface : — viz. — first, the Lime- 

 stones above the Basalt ; then the Basalt; and, lastly, at Croglin (the 

 southern extremity of our observations), the beds of Limestone below 

 the Basalt, successively cropping out on the brow of the escarpment. 



It would be extremely difficult to obtain an uninterrupted Section 

 from the preceding Coal-bed to that -worked at Croglin ; the following 

 is, however, a Section of strata lying below the Talkin Coal, exhi- 

 bited at Croglin Fell. 



Limestone, 

 Sandstone, 



Fa. Ft. In. 



2 











3 











2 



4 







1 











8 



2 



4 



3 



3 



7 



3 



5 







1 



4 







3 











2 



3 











3 



3 



32 



1 



2 





Fa. Ft. In. 



.. 



7 







3 



Carried forward, 



... 10 



