280 Messrs. Bucrland's and Conybeare's Observations on the 



Section 26. 



The following; seams are mentioned in Mr. Strachey's Memoir in the Philos. 

 Trans, for 1719^ as being worked in the parish of Stan ton -Drew^ a little to 

 the east of those mentioned in Section 20, and at Glutton, on the same drift, 

 to the south by east. 



Dip E. by N., 1 in 3. 



At Glutton there are from 10 to 14 fathoms of red earth ; at Stanton-Drew the 



coal-measures rise to the surface. 



Greys and cliff 



1. Small lime coal 

 Cliff . 



2. Coal fit for culinary purposes 

 Cliff . 



3. Good hard coal . 



Fath. 



Ft. 



In. 















. 



3 







3 















2 



6 



3 











2 







10 



Chapter III.— ON THE COAL-BASIN OF THE FOREST OF DEAN. 



Having given in the introductory chapter a general account of this coal- 

 basin, we shall now describe more fully its principal inclined formations, and 

 the characters and more remarkable local phenomena which here distinguish 

 them. 



For much of the information contained in this chapter, and for the accurate 

 sections [see Plate XXXII. fig. 5. and the section at page 288.] appended to 

 it, we are indebted to the author of those sections, that able metallurgist and 

 engineer, Mr. David Mushet of Coleford*. The most important natural dis- 

 play of the structure represented in the sections is afforded along a line 

 running east and west from May-hill, through Longhope and Mitchel Dean, 

 to the borders of the Forest. We have there a regular series of the beds from 

 grey-wacke to the coal-measures, all dipping conformably to one another, 

 and westwards at a high angle. 



1. Grey-wacke. 



The formation, to which we here apply the term grey-wacki, consists of 



* These sections were presented by their author to the Geological Society, in the years 1812 

 and 1815. We are happy to learn, that he has it in contemplation to publish a volume on the 

 Geology, Mines, Metallurgy, and mining customs of the Forest of Dean. 



