100 SPENCER : GNEISSOID GRANITE IN THE HALIFAX HARD BED COAL. 
It may be of interest to note the exact locality in which the 
boulder was found. It came from under the north side of a hill called 
Barehead, in Shibden-dale, about two miles north of Halifax. The 
round whitish boulder above-mentioned came from under the south 
side of the same hill, at a distance of about half a mile from the place 
where the present one was found. The Hard Bed at Shibden Head 
Pit is found at a depth of 450 feet from the surface, the geological 
horizon of that coal being about 200 feet above the Rough Rock, the 
uppermost member of the Millstone Grit series. In conclusion it 
may be useful to note that about 600 feet of strata, including the 
Northo^vl•anl and Elland Flag Rock, intervene between the Hard Bed 
and the Better Bed Coals, while the Black Bed Coal lies 120 feet 
above the Better Bed Coal. The materials forming these strata 
appear to have come from the north-west. A knowledge of this, 
along with that of the structure of the boulders, may help to form 
some idea of the locality of the parent rock from whence the boulders 
were derived. 
Professor Bonney detected a resemblance between the rounded 
grains in the quartzite from the Black Bed Coal and those in a 
specimen of quartzite from the Lickey Hills and from the Charnwood 
series, he, however, very guardedly remarked, " Of course I 
do not mean to suggest that we must look in this direction for the 
parent rock." If we may judge from the direction in which the 
materials forming the Millstone Grits, and the Lower Coal Measure 
Grits and Sandstones have come, it is not improbable that the 
Gneissoid granite under notice may have come from some pre- 
Cambrian rocks connected with, or Scottish outlier of, the Scan- 
dinavian mountains. 
