234 Proceedings of Philosophical Societies, [March 



road from Pont d'Onilly to Falaise. The greyvvacke is not very 

 abundant among the argillaceous slate, but may be observed iii 

 several places. 



In the north-eastern part of the department of La Manche, the 

 slate is in general of a similar character to that found in the for- 

 mer department. 



At St. Vaast and Reville, the slate hills suddenly terminate 

 upon granite, which resembles in its characters that of Dart- 

 moor, hke it containing large crystals of felspar, sometimes as 

 much as two inches in length ; and varying in colour from a 

 grey to a light red tint, according to a change in the colour of 

 the felspar. At Reville, the granite of the coast has a tendency 

 to split in two directions, one E. and W. ; the other N. and S. 

 and to form large blocks, of which the angles are not right 

 angles. The granite of St. Vaast and the opposite island 

 is split into similar obhque blocks, and the fissures are 

 in the same direction. At St. Honorine, a grey granite is 

 found, of which that in the neighbourhood of Vine may be 

 deemed a continuation. 



On the coast of Calvados there are the remains of two sub- 

 marine forests ; one, namely, between Benerville and Villers sur 

 Mer ; and the other opposite St. Laurent, whose trunks and 

 branches of trees cross each other in every direction, and the 

 general appearance resembles very much that described by Mr. 

 Horner as occurring on the coast of Somersetshire, near the 

 river Parret, except that the trees are more fully decomposed, 

 being used for manure by the country people of the neighbour- 

 liood. 



From the preceding account it will be seen that the rocks of 

 this part of the coast of France correspond in position, and very 

 generally in structure and org&i^ic r^m^in^,,with similar rocks on 

 the coast of England, being, prpbab^yyth^ continuation of those 

 which appear along the cofts^si of ftonset and Devonshire, and 

 the Isle of Wight. i i,,iq jn3}^ ,// • 



A paper was read on '' A Fl^-e^water Formation at Hordwell 

 ChU Hampshire, and on the subjacei^t Beds from Hordwell ClifF 

 to Muddiford. By Thomas Webster, Sec. G. S. 



In this paper Mr. Webster stated, that having very recently 

 examined this coast, he found that Hordwell cliff' was not formed 

 of the London clay as was generally supposed ; and as he had 

 stated from the accounts of others in a former paper published 

 in tlie Transactions of the Geological Society ; but that it was 

 composed of beds analogous to the lower freshwater formation 

 of the Isle of Wight. Under these beds, which dip to the E. is 

 another of white sand, and below this in the next chff to the 

 W. appears the bed similar to the London clay, and which con- 

 tains the well known fossils published by Brander. This forms 

 also the inferior part of a part of the coast still further to the W. 

 called the High Clifi) which reaches nearly to Muddiford. 



