Appendix.
Percentage of the Rocks included in the Glacial drifts of Lancashire and N. W. Cheshire.
Manchester (mean of three examinations, given by Mr. Binney, Trans. Man. Lit. Phil. Soc. vol. x. p. 133).
Angular. Partly rounded. Total.
Granites, greenstones, and other igneous rocks 5.0 10.0 6.0 21
Slates and Silurians 3.66 9.0 8.33 21
Mountain Limestones 1.0 3.0 2.0 6
Coal-measures 25.33 19.0 5.0 49.33
New Red sandstones 2.0 0.66 0.0 2.66
Striated rocks ... ... ... 1.66
Gorton, near Manchester (determined by Prof. Ramsay. Mem. Geol. Survey, ' Geology of the country around Oldham').
Granite 6
Felspar porphyry 31 |43 per
Felstone 2
Porphyritic conglomerate 4
Ironstone 2 |37 per cent.
Silurian grits 37 per cent.
Carboniferous limestone 3
Carboniferous grits 14 |17 per cent. Carboniferous.
Eastham, on the Mersey, near Birkenhead (given by Mr. Hull, Mem. on Oldham, p. 51).
Granite 8
Greenstone 8
Felspar porphyry 5 | 37 per cent, igneous.
Felstone 7
Quartz rock 9
Ironstone 1
Silurian grits | 43 per cent.
Carboniferous limestone 4
Carboniferous grits 1 | 5 per cent carboniferous.
Triassic or Permian sandstone 12
7. On the Postglacial Deposits of Western Lancashire and Cheshire*. By C. E. de Rance, Esq., F.G.S., of the Geological Survey of England and Wales.
Wirral, Cheshire. — The general form of the ground of the peninsula of Wirral has already been described in my paper on the glacial phenomena of the district, — the northern portion being a low alluvial plain, with a hill in the centre (on which Liscard is built), rising like an island above it, and bounded on the south by a line of old cliff, abruptly terminating the various longitudinal valleys which, running with the strike of the rocks, traverse the southern portion of the district. Much of this low plain is below the sea-level, being naturally protected from the sea by a range of sand-hills, about
- Communicated with the permission of the Director-General.
