* 
, 
7 
233 
ON THE GEOLOGY OF THE NORTHERN PART 
OF THE COUNTY OF STAFFORD. 
By J. B. Jukes, B.A. F.G.S. 
Tue geological structure of the northern part of the county of 
Stafford is so intimately connected with that of Derbyshire that, 
although my materials are very scanty, it appears better to throw 
them together in the form of a supplement to my last paper, than 
to break the connection between the two. The rocks which enter 
into the composition of N. Staffordshire are precisely the same with 
those of Derbyshire, with the exception that no toadstone, or other 
igneous rock, is any where visible. The diluvium also differs some- 
what, since there is in Staffordshire a greater abundance of far- 
travelled boulders than in Derbyshire ;* large blocks of porphyry, 
granite, and other rocks, washed from the mountains of Cumber- 
land, may be seen scattered over the Pottery coal-field and the 
country to the south, forming part of the great northern drift which 
has swept a mass of ruins over all the country intermediate between 
Cumberland and Worcestershire, and some of which have even been 
carried as far as the Bristol Channel. 
In passing from Derbyshire into Staffordshire, little or no change 
takes place in the character of the scenery. The same high brown 
or purple moors of gritstone, the same green hills of limestone, and 
the same richly-wooded tracts of new red sandstone, may be seen in 
one as in the other county. There is, however, by no means that 
regularity of structure in N. Staffordshire, considered as a whole, 
which was observable in Derbyshire. The mountain limestone is 
confined to a patch on the eastern side of the district,+ while the 
distribution of the shale and gritstone, the coal measures and new 
red sandstone, over the remainder is, at first sight, very irregular. 
This distribution will be best understood by marking on a map first, 
the outline of the mountain limestone, and next, of those parts occu- 
pied by coal measures, the intermediate portions being understood to 
* Since writing the first part of the Geology of Derbyshire, I have been 
informed by Mr. Barker, of Bakewell, of the occurrence of granite boulders 
in Haddon field, and by Prof. Sedgwick of his having observed them on the 
summits of the hills bordering Derbyshire and Cheshire. 
+ Of course, its appearance on the surface is here meant, as it is believed 
to underlie all the rest of the district. 
VOL. IX., NO. XXVI, 30 
