XXXVl PROCEEBIN^GS OF THE GEOLOGICAL SOCIETY. 



pebbles in gravels within the Wealden area, and the manner in which 

 the transverse valleys open out, estuary-shaped, into the Weald, 

 he infers that that was occupied in Postglacial times by an inlet 

 of the sea, into which rivers flowed from the Thames-valley area, 

 and that the denudation was chiefly effected by tidal erosion during 

 a gradual upheaval of the land. 



The Eev. John Gunn is now of opinion that the "Forest-bed 

 series," which he has so long and carefully studied, is older than the 

 Norwich Crag and the Chillesford Clays, and that the latter covers 

 both the other deposits transgressively in proceeding from the coast 

 toward the interior of the country. 



Mr. Ray Lankester has made further contributions to our know- 

 ledge of the Crag-beds of Norfolk and Suffolk. He considers that 

 the Stone-bed at the base of the Norwich Crag is not identical with 

 the Bone-bed at the base of the Suffolk Crag, and shows the marked 

 difference in their mammalian fauna. The Ehinoceros, Tapir, Hip- 

 parion, and Hyaena of the Bone-bed are introduced Miocene 

 species ; while the Elephants and Deer of the Stone-bed and Forest- 

 bed are of Pliocene species not found in the Bone-bed. He de- 

 scribes from this latter bed a new ziphioid cetacean, and has deter- 

 mined the presence of Mastodon arvernensis in a sandstone nodule 

 found in it. Of these nodules Mr. Lankester gave additional par- 

 ticulars, showing, by their organic remains, their derivation from 

 beds of " Diestien " age. 



In making excavations for the extension of the dockyard in 

 Portsmouth Harbour, a fine section of the Lower part of the London 

 Clay, with overlying gravel and alluvial beds, has been exposed ; 

 and a good account has been given of them by Mr. C. J. A. Meyer. 

 Some of the beds are very fossiliferous, and contain an assem- 

 blage of species which have not been found elsewhere in the London 

 Clay : one of the species is a Thanet-sand form, while another is the 

 well-known Cardita jplanicosta of the Braoklesham beds and of the 

 Galcaire grossier. 



Secondary Formations. 



The only communications we have had on the Cretaceous series 

 are as follows. Mr. Whitaker describes the divisions of the Chalk of 

 the south coast. He shows that the Chalk Marl and Lower Chalk 

 thin westwards, while the Upper Chalk with flints passes trans- 

 gressively over and beyond it, and thus are flints found so far west. 

 Mr. Judd gives the result of his further examination of the Neoco- 



