THE GEOLOGY OF THE ENGLISH CHANNEL. 179 



transitinn formations. Srnindings sliow that the}' consist in pai't of (lelaclied 

 stones (jn'erres dcsagregees) ; in addition to which rotten rocks {roches ivmnies) 

 are frequent around latitude 49° 15', longtitude 7° 10' (W. of Paris), in tlie 

 ndd-course of the valley of la Manchc. 



" Further to the east the rocks should be submarine extensions of the 

 secondary formations which build up the opposite coasts of France and 

 England. Thus the coast rocks of Calvados, which are limestones of the 

 lower Jurassic period, are continued far out under the sea. And, similarl}^, 

 white chalk is found at a considerable distance from the chalk cliffs of Fecamp, 

 of Dieppe, and of Saint-Valery en Cau.v, and is especially prominent on the 

 bed of the Pas-de- Calais," etc. 



APPENDIX II. 



By the kind permission of Mr. A. R. Hunt, m.a., p.q.s., the following 

 petrological notes, abstracted from his papers on the Submarine Geology of 

 the English Channel^ are here reproduced. 



In his work, Mr. Hunt had the assistance of the late Mr. E. B. Tawney, 

 M.A., F.G.s. (E. B. T.), Prof. T. G. Bonney, m.a., f.g.s. (T. G. B.), and Mr. A. 

 Harker, m.a., f.g.s., (A. H.), and all the notes herein included are taken from 

 the descriptions written by some one or other of these petrologists. 



The initials of the authorities, as given above, follow each entry. 



Although for present purposes the notes have been somewhat shortened, no 

 variation has been made amounting in any Avay to more than the exclusion of 

 minor detail. 



All bearings are magnetic, and bearings and distances alike are given on the 

 authority of the fishermen who traAvled the blocks. Hence minute accuracy 

 can not be expected, but, on the other hand, subsequent experience indicates 

 that probably no very considerable error has been made. (Plate XVII.) 



CRYSTALLINE ROCKS. 

 Eight Granite. Nos. 2, 19, 20, 27, 34, 35, 39, 42. 



H. 2. Doorstep of Brixham Orphanage. A granite of moderately coarse 

 grain and pinkish colour, with large pale flesh-coloured orthoclase twins. 



Biotite and muscovite in about equal proportions. Orthoclase largely 

 predominant, but some plagioclase present. 



The quartz contains cavities, some with moving bubbles ; also microlite 

 needles, and hair-like delicate crystals of undetermined character. Some 

 apatite is present. — E. B. T. 



1 Transactions of the Devonshire Associations, 1879, 1880, 1881, 1883, 1885, 1889. 



