Vol. XI.l 
PROCEEDINGS 
OF THE 
YORKSHIRE 
GEOLOGICAL AND POLYTECHNIC 
Edited by JAMES W. DAVIS, F.S.A., F.G.S., kc. 
1890- 
ON THE CHANGES OF THE LOWER CARBONIFEROUS ROCKS IN YORKSHIRE j 
FROM SOUTH TO NORTH. BY J. R. DAKYNS, ! 
OF H.M. GEOLOGICAL SURVEY. '| 
In order to understand the geology of the country north of the | 
Aire, I will first give a short sketch of the chief features presented j 
by the Millstone Grit and Lower Carboniferous measures, as we follow 
the beds from Derbyshire to Wensleydale. 
In Derbyshire the Millstone Grit, as hitherto defined, consists in 
descending order of four or five well-marked grits, separated by 
shales, viz. . the so-called first or topmost grit, named also Rough 
rock from its coarse character ; the second grit, generally a flagstone ; 
the bold, well-jointed rock of Hathersage Edge and Stanedge, or. the 
third gTit ; and lastly, the fourth or Kinderscout grit, which some- I 
times consists of two beds. | 
Below the Kinderscout grit comes a thick and variable series of - 
sandstones and sandy shales, the " shale grit" of Farey, which has 
been generally called the Yoredale or Upper Yoredale grit ; and then \ 
come shales in which sometimes occur siliceous sandstones, known as ' 
Yoredale Sandstones, or Lower Yoredale Grit ; then come calcareous j 
shales ; and finally the Carboniferous Limestone of unknown thickness, I 
the upper part of which is thin-bedded and cherty, the lower massive ! 
and free from chert. ] 
i 
j 
I 
[Part III. j 
SOCIETY. 
