TRANSACTIONS OF SECTION C. 475 
Carboniferous Limestone Series. 
o Balfour Bore, Fife. . . 36 feet below Calmy Limestone 
horizon. 
o Bilston Burn. . . 100 feet below Calmy Limestone 
horizon. 
o Balfour Bore. . ws 360 feet above Index Limestone 
x Giffnock . é : ; : 270 feet =, a - 
o Balfour Bore. . . ; 150 feet ,, A 3 
o Bilston Bun. . ay 12 feet _,, - “a 
o Bishopbriggs, Hunters’ Hill . just ,, i a3 
x Kirkintilloch . . A é 40 feet below Index Limestone 
o Linlithgow I ‘ Z * 200 feet as hy = 
<x Bilston Burn . : 2 £ 540 feet sa $3 Be 
x Balfour Bore . ‘ 4 Z 798 feet ss 3 5 
o Balfour Bore. . . . 1,242 feet S <s % 
< Balfour Bore . " ( . 1,374 feet > af “a 
o Bilston Burn . : 3 5 feet below Hosie Limestone 
horizon. 
x Bilston Burn . ° 10 feet above North Greens Lime- 
stone. 
Calciferous. 
x Milngavie + +.  . above the Traps and below Hurlet 
Limestone. 
x Burntisland, Grange Quarry. about Burdiehouse horizon. 
x Hailes Quarry. 
x Craigleith. 
Conclusions and Suggestions.—The sands containing such an extraordinary 
quantity of angular garnet have been derived from the Highland schists to the 
north and north-west of the basin, whilst the sands devoid of garnet are likely 
to have come from the north-east, east, or south. 
It may be possible by a study of the heavy mineral grains and of the current- 
bedding, and the thickening and thinning of the beds, to subdivide the whole of 
the Carboniferous accumulation into a number of great lens-shaped or wedge- 
shaped bodies of sediment, which have been introduced from various directions 
and are interdigitated in a complex manner. These great lenticles might be 
expressible on maps, and might be helpful in explaining the lateral changes and 
the distribution of the coals. 
9. Report on the Hacavation of Critical Sections in the Paleozoic 
Rocks of Wales and the West of England.—See Reports, p. 1386. 
10. Interim Report on the Microscopical and Chemical Composition 
of the Charnwood Rocks. 
11. Report on the Investigation of the Igneous and Associated Rocks 
of the Glensaul and Lough Nafooey Areas, Co. Galway.—See 
Reports, p. 148. 
WEDNESDAY, SEPTEMBER 11. 
The’ following Papers were read :— 
1. A Theory of the Menai Strait. By Epwarp GREENLY. 
Ramsay’s view of the strait as a glacial furrow was in the main accepted ; 
but it was shown, from the general glacial phenomena, and from soundings, that 
the middle reach of the strait cannot be explained in that way. Evidence was 
adduced to show that this reach was excavated by glacial waters during the 
recession of the ice at a time when the mutual relations of the ice of the 
