B02 Reports and Proceedings— 
Herm and fark. These are pierced by various dykes, and among 
them by an intrusion containing olivine, which may be placed with © 
the group of picrites. ‘There is also in the island a dyke of mica- 
trap. 
The eastern part only of Alderney, but the whole of Burhou, the 
Casquets and their neighbouring reefs, consist of stratified rocks. 
These contain rare beds of fine mudstone, but are generally false- 
bedded sandstones, and grits, sometimes with pebbles, often rather 
coarse and angular, occasionally becoming typical arkoses. At a 
point on the southern cliffs of Alderney they may be seen to rest on 
the crystalline igneous mass. - A series identical in constitution and 
aspect occurs at Omonville, on the mainland, a few miles east of Cap 
la Hague (as had also been noticed a few months earlier by 
M. Bigot). These have been correlated with others near Cherbourg, 
and described as underlying the “ grés Armoricain.” The Alderney 
erits therefore form part of a series which can be traced over 30 
miles, and which belongs to the Upper Cambrian (of Lapworth). 
Remarks were made on the Jersey conglomerates (Ansted’s con- 
jectural identification of these with the Alderney grits being 
approved), on the resulting evidence that the Jersey rhyolites are 
not Permian, but Cambrian at the latest, on the still earlier age of 
the Guernsey syenites and diorites, and on the antiquity of the 
Guernsey gneisses. 
2. “On the Ashprington Volcanic Series of South Devon.” By 
the late Arthur Champernowne, Esq., M.A., F.G.S. Communicated 
by Dr. A. Geikie, F.R.S., F.G.S. 
The author described the general characters of the volcanic rocks 
that occupy a considerable area of the country around Ashprington, 
near Totnes. They comprise tuffs and lavas, the latter being some- 
times amygdaloidal and sometimes flaggy and aphanitic. The 
aphanitic rocks approach in character the porphyritic “schalsteins” 
of Nassau. Some of the rocks are much altered; the felspars are 
blurred, as if changing to saussurite, like the felspars in the Lizard 
gabbros. In other cases greenish aphanitic rocks have, by the de- 
composition of magnetite or ilmenite, become raddled and earthy in 
appearance, so as to resemble tuffs. The beds are clearly inter- 
calated in the Devonian group of rocks, and the term Ashprington 
Series is applied to them by the author. Although this series 
probably oontains some detrital beds, there are no true grits in it. 
Stratigraphically the series appears to come between the Great 
Devon Limestone and the Cockington Beds, the evidence being 
discussed by the author, however, not so fully as he had intended, 
as the paper was not completed. 
II.—May 22, 1889.—W. T. Blanford, LL.D., F.R.S., President, 
in the Chair.—The following communications were read :— 
1. “Notes on the Hornblende Schists and Banded Crystalline 
Rocks of the Lizard.” By Major-Gen. C. A. McMahon, F.G.S. 
The Lizard district has been visited by the author on three 
occasions during the years 1887-8-9, and the specimens of the 
