THE GEOLOGY OF THE ENGLISH CHANNEL. 171 



European region. We may suppose that the Atlantic waves had long 

 been thundering against the western land which united France to 

 Ireland, and that at last only a narrow tract of rocky land between 

 Cornwall and Brittany remained to separate the western ocean from 

 the lowland of the Anglo-Parisian area. The final breaching of this 

 was accomplished during the subsidence to which the Calcaire Grossier 

 testifies; the waters of the Atlantic soon widened the straits, and 

 established a sub-tropical fauna and fiora on the southern shores of 

 Britain." 



Mr. Jukes-Browne gives a map showing the geography of the 

 Anglo-Gallic area as so interpreted ; this with some addition and cur- 

 tailment is here reproduced (Text, fig. 3). The Eocene of Carentan has 

 been marked ' C,' the similar si rata near the mouth of the Loire have 

 been marked ' L,' and the position of the dredging M. 77, from which 

 came the Eocene limestone, is indicated by the letter ' E.' The confir- 

 mation afforded by this discovery to the views of French geologists, in a 

 problem the key to which lies in their country, is a pleasant matter to 

 record. 

 GENERAL CONCLUSIONS. 



The atfinities of the crystalline rocks in the area examined are 

 strongly toward Brittany, and but slightly toward the mainland of 

 Devon and Cornwall. 



There is evidence, amounting at the least to a strong suspicion, that 

 the granite which occurs at and around a point 20 miles south 26° west 

 from the Eddystone is post-carboniferous ; and this granite exhibits a 

 tendency toward the Dartmoor type. 



The Triassic outlier off the Lizard and Dodman discovered by the 

 late E. N. "Worth has proved to be connected eastward with an even 

 larger area of New Bed Sandstone rocks, which may very probably be 

 continuous with the nearest shore exposures. 



A clear indication of the eastern boundary of the Trias has been 

 found at a point about 20 miles south 17° west of the Eddystone. 

 There seems fair reason to suppose that the western boundary of the 

 Jurassic formations may for a short distance approximate to a line 

 drawn south-west from this point. It may, however, be noted that 

 Lias limestone was found in a detrital deposit at Cattedown (Ply- 

 mouth) by the late K. N. Wortli. 



The Cretaceous rocks dredged from the Channel are now for the 

 first time recognised to include chalk as well as flint. There is some 

 possibility that the rock found is from the base of the Middle Chalk. 



Flints, in addition to occurring on modern beaches, are found also in 

 the raised beaches of Devon and Cornwall ; were very numerous, 



