GILLIGAN : THE LOWER PERMIAN AT ASHFIELD, ETC. 
293 
noted. It shows the rounded form and amber yellow colour with 
patches of alteration products. When tested spectroscopically it 
yields the characteristic spectrum. 
Source of the Material. 
The miter must refrain from making any wide generalisation upon 
this subject, at this time, postponing such until the larger work which he 
has carried out in collaboration with Mr. H. C. Vessey, M.Sc, on the 
Permian Sands and Conglomerates of the North of England is ready 
for publication. It will be sufficient here to point out that, with the 
exception of the staurolite, all the other pebbles and minerals herein 
described have been found to occur in the Carboniferous Rocks of the 
Pennine area. The staurolite is interesting as being fairly common, 
and as having the same '"toothed " or frayed " outline which has 
been figured and described by Dr. H H. Th mas a 7 occurring in the 
New Red Sandstone of the West of England,* and by Mr. T. 0. 
Bosworth from the Carboniferous Sandstones of Scotland.* 
I am much indebted to Mr. J. A. Butterfield, M.Sc, for the careful 
drawings of the heavy minerals which he has made to illustrate this 
part of the work. 
* Petrography of the New Red SayidsLone (Dr. H. H. Thomas). 
Quart. Journ. GeoL Soc, Vol. LXV., PI. XII., fig. 4e. 
* Heainj Minerals in the Sandstones of the Scottish Carboniferous 
Bocks, Proc GeoJ. Assoc., V->1. XXIV., Tt 2. 
