368 D. Jones — On the Carboniferous Deposits of Shropshire. 



Viger Coal. In the Madeley Meadow Pit section we have a '' Sill 

 Coal" and a "Bottom Coal" shown above the Pennystone. In the 

 same section we find "Two -foot" Coal, and below it " Ganey" Coal. 

 Now the " Two-foot" here so called is the " Sill Coal " underlying 

 the "Viger Coal," and the real "Two-foot" is the Ganey coal, 

 for it overlies the Best Coal which is the proper place for the Two- 

 foot Coal in all the sections. 



In the Castle Green Trial Pit we actually have the Sill Coal 

 immediately below the Sulphur Coal, and helow that the Viger Coal, 

 We then have the Two-foot, here called Ganey Coal, in its proper 

 place over the Best Coal. The Best Coal having with it the Linseed 

 Earth, which almost invariably lies just below it. 



The term Middle Coal seems to be used in cases where the Eandle 

 Coal is divided, or where the name Eandle is not given. Thus in 

 the Castle Green Trial Pit we have "Middle and Clod Coal Gob" 

 underlying the Best Coal. Again, in the Lodge Pit, Madeley, the 

 " Middle Coal " is shown lying between the Best and Clod Coal, 

 which is the place for the Eandle Coal, there improperly called 

 Middle Coal. The terms " Sulphur," and "Main Sulphur Coal," in 

 the southern part of the district, are very confusing to the inexperi- 

 enced. The Sulphur Coal of the older deposits is always known by 

 having the Penny-measure above it, whereas the Sulphur Coals of 

 the younger series are very numerous, and, with the exception of one 

 which has the Spirorbis Limestone overlying it at about 13 to 20 

 yards, I know of no associated stratum sufficiently persistent to 

 enable me to fix their horizon in the measures. However, by the 

 " Main Sulphur Coal " is meant, in the South, the Younger Sulphur 

 Coal, having the Spirorbis Limestone within 13 to 20 yards above it. 

 Indeed, it is tliere much thicker than the Sulphur Coal which under- 

 lies^ the Penny-measure. That, like the Pennystone, seems to be 

 subject to the same law of attenuation as we proceed southward. 



We have in the Madeley Meadow Pit a "Bottom" Coal, four feet 

 thick, above the Pennystone ; it is the same as in every other case is 

 called Upper or Big Flint Coal.^ The following table will show the 

 true relationship of these Coals. 



North. South. 



Sulphur Coal | Sulphur. 



( Viger. 



Upper Clunch ) < Upper and 



Lower Clunch j Sill Coal j Lower. 



Two-feet Coal Little Ganey. 



( Ganey. 



Best Coal Best Coal. 



Handle Coal Middle Coal. 



Clod Coal Clod Coal. 



Little Flint Little Flint. 



We shall now know of what Coals we are treating, whether the 

 name be borrowed from the North or South. 



Now as to the law of attenuation affecting the Penny-measure, 

 Sulphur Coal, and the Clunch Coals, as we go from North to South, 



The Pennystone decreases in thickness from 31 feet to 6 feet ; 

 Sulphur Coal from 5 or 6 feet to two seams, 1 ft. 4 in. and 1 ft. 3 in. ; 

 Clunch Coals together 3 ft. 6 in. to 1 ft. 6 in. 



1 The Eider Coal is the Double Coal. 



