Yorkshire Boulder Committee: Its Eleventh Vear’s Work. 335 
11. Mountain limestone. —9X5X3 inches. Rounded. On 
a wall near road to the E. of Sprotborough Park. 
12. Diorite. Very similar to No. 3, but smaller.. In a field 
on the Malton Road W. of Sprotborough. The fields 
here are very pebbly, and numerous carboniferous 
grits, ganisters, etc., occur, together with a few 
mountain limestones and igneous rocks. 
13. Diorite. More coarsely crystalline than No. 12. 5x4x 
inches, ub-angular. In stone heap ‘off the land’ 
on footpath from Sprotborough to Cusworth. 
BALBy. 
1. Basalt. 24x 22x20 inches. Sub-angular. In the South 
Yorkshire Brick Works 
2. re 9x6x4 inches. Rounded. Same place. 
. Granophyre. 1ox6x4 inches. Rounded. In Wood’s 
Sand Pit. 
4. Granite. 8x6x6 inches. Sub-angular. In Gibson’s 
Brick Pit. 
5. Granite. Found by Mr. T. Gill ae stones ken from 
South Yorkshire Brick Works. 
6. Gneiss. Same as No. 5. 
7- Volcanic agglomerate. 9x7x3 inches. Sub-angular. In 
South Yorkshire Brick Works. 
8. Quartz porphyry. 63x 3 inches. Rounded, smooth, 
ink colour. In Cocking’s Brick Pit. 3 
9- ? 12x10x6inches. Sub-angular. In South York- 
shire Brick Works. 
In Gibson’s Pit, 29 yards from the Worksop Road and about 
13 yards from the boundary of the South Usa We the 
workings have exposed a bed of coarse san mposed 
‘apparently of the detritus of millstone grit, and pene? es 
numerous fragments of coal, together with a few rounde 
_ Carboniferous boulders. The bed extends about 20 feet in the 
- face of the till, and is about one -foot thick at its thickest part. 
It is about 12 feet from the surface, and both above and below 
the till is of the usual character. In this part of the works the 
boulders are more numerous than i in any other and are pagers 
comprised of very hard lower magnesian limestone. 
_ Doncaster. 
1. Basalt. 10x 6x 4 inches. Among the material turned out 
___in excavating behind the Old Free Library. 
- pros atte : 
