ROCKS OF NORMANDY. 267 
towards Devon, the superposition upon them of Devonian rocks 
prolonged from the coasts of Devon and Cornwall, and their partial 
conversion into quartzites (which has been already described as 
locally effected by extreme metamorphism in the Devonian grits of 
La Manche )? To these I might add the probability of an extension 
of the Devonian rocks of La Manche towards Devon, on the eastern 
flank of the granitic mass of which Jersey, Guernsey, &c. are the 
highest summits. Applying these inferences to the solution of my 
fourth and concluding proposition, I feel justified in ascribing: first, 
such granitic, porphyritic, and stratified rock fragments of the Lower 
Trias of South Devon as cannot be reasonably referred to rocks within 
the limits of the south-western counties (whether exposed or con- 
cealed by Secondary strata) to the many varieties of igneous rocks 
and Paleozoic formations doubtless occurring in the area now occu- 
pied by the Hnglish Channel; secondly, the Budleigh-Salterton 
pebbles to Devonian and Silurian quartzites, and in some cases 
perhaps to igneous and Paleozoic sources formerly existing in the 
Channel area. 
In conclusion, I have to acknowledge the kind offices of Messrs. 
Linford and Vicary in furnishing me with information bearing on 
the subject, and in putting their libraries at my disposal. 
Discussion. 
Prof. Ramsay remarked that the fossils in the Budleigh-Salterton 
pebbles are of Silurian as well as of Devonian species. He supported 
the view that the pebbles were derived from rocks now destroyed by 
denudation, and existing in what is now the Channel area. He 
supported the views of Mr. Godwin-Austen on the grouping of the 
Triassic beds and on their origin in a great lake. 
