52 



WEALD ON GROUP. 



WEALDEN GROUP. — Walderthongebilde, Germ. 



English Authors 

 Weald Clay. . 

 Hastings Sands. 

 Ashburnliam Beds 

 Pnrbeck Beds . 



French Authors. 

 Argile Veldienne . 

 Sable ferragineux . 

 Calcaire Lumachelle 

 Purbeckien, Brong. 



German Authors. 

 Walderthou . . . 

 Hastingssandsteine 

 Ashburnham Scliicte 



The Wealrlen Group comprises a series of layers of clay, 

 sand, and shale, with subordinate beds of limestone, grit, 

 and sandstone, containing, more or less regularly distri- 

 buted, fluviatile shells, Cyrena, Unio, Paludina, &c. ; re- 

 mains of land-plants, Ter7is, Cycas, Palms. &c. ; bones and 

 teeth of Saurians, Iguanodon, &c. ; and fishes, Pycnodus, 

 Lepidotus, &c. : occasionally, however, a few marine tes- 

 tacea, Bulla, Ostrea, &c., may be observed, which appear 

 to mark the estuary character of the Wealden. The fol- 

 lowing subdivisions are adopted from Dr. Mantell, (Geol- 

 S. E. of England, p. 182.) 



1. Weald Clay. — Average tliickness 140 to 200 feet. 



Stiff clay of various 

 shades of blue and 

 brown ; with subor- , 

 dinate beds of lime 

 stone and sand ; Sep 

 taria. 



Paludina, Cypris Val- 

 densis, Cijrena, &c., 

 bones of reptiles, rare- 

 ly ; scales and bones of 

 fishes. 



The Wealds of Sus- 

 sex, Surrey, and Kent : 

 forming the vale be- 

 tween the Downs and 

 Forest Ridge. 



