112 
an outlier of the upper sandstone occupies the centre, 
encircled, more or less completely according to the continuity 
of the rock, by a belt of the lower sandstone. The depth of 
the Barnsley Coal may be expected to vary from 500 to 700 
yards. 
It is somewhat in favour of the explanation just given 
that in the neighbourhood of Wickersley, near Rotherham, 
we again find a pair of thickty bedded, softish, light brown 
sandstones, and perfectly independent calculations give the 
distances of these rocks from the Barnsley Coal very nearly 
the same as those of the Houghton Common and Brierley 
Eocks, viz., 680 and 545 yards. 
Further details respecting the geology of the country 
treated of in this paper may be learned from the maps of the 
Geological Survey, and from a Memoir on the Greology of 
the Yorkshire Coal Field that will be issued shortly. 
