1871.] 



JTJDD PTTNPIELD POKMATIOK. 



215 



carbonaceous matter and sometimes becoming perfectly black and 

 resembling an impure lignite. This portion of the bed contains 

 but few shells, and passes by insensible gradations iato the inter- 

 laminated sands and clays above. 



The middle portion of the marine band is almost wholly made up 

 of oyster-shells, with a few dwarfed specimens of Corbula, Cyrena (?), 

 and Oardium. Like the upper portion it contains verj^ much car- 

 bonaceous matter. I have not obtained from this portion any 

 specimens of Ammonites or Vicarya. 



The lowest portion of the marine band to the thickness of 6 or 8 

 inches is a hard, more or less ferruginous, very shelly limestone of 

 a blue colour, weathering brown at the joints, and containing 

 numerous pebbles or concretions composed of argillaceous limestone. 

 This bed of hard limestone is traversed by some irregular seams of 

 hard blue clay or shale ; it contains comparatively little carbonaceous 

 matter, but yields Ammonites, Vicarya, and other marine shells. 

 The oysters in this portion of the marine band are sometimes large 

 and approach very closely to their typical forms*. 



Almost immediately Underlying the marine band are the varie- 

 gated Wealden Clays and Sands, which in Swanage Bay attain 

 probably to a thickness of nearly 2000 feet, and yield, so far as 

 I know, only the remains of freshwater and terrestrial forms of 

 life. 



The following fossils have been obtained from the marine bands 

 of Punfieldt. 



Teeth of Lamna, sp. 



Pycnodus, sp. 



Ammonites Deshayesii, Leym. 

 Vicarya pizcuetana, Vilanova, sp. 



Lujani, Be Verneuil et Gollomb. 



Pradoi, Be Verneuil et Be Lor iere. 



Cerithium Vilanovte, Be Verneuil et Be 



Loriere. 



■ Pailleti, Z)e Verneuil et Be Loriere. 



Turritella Tournali, H. Coquand. 

 Pleurotoma Utrillasi, Be Verneuil et 



Be Loriere. 

 Eusus (?) neocomiensis, -D' Orb. 

 Actaeon Esquerse, Be Verneuil et Be 



Loriere. 

 pradoana, Be Verneuil et Be 



Loriere. 

 Actseonella oliTiformis, H. Coquand. 

 Trochus Esquer^, Be Verneuil et Be 



Loriere. 

 Natica laevigata, Besh., sp. 



pradoana, Vilanova. 



Neritopsis minima, Be Verneuil et Be 



Loriere. 



Orthostoma Verneuili, Vilanova, sp. 

 Exogyra Boussingaulti, B' Orb. 



sinuata, Sow. (dwarfed). 



Anomia laevigata, Sow. 



Plicatula asperrima, D' Orb. 



Perna Rauliniana, Pictet et Eoux. 



Modiola giffreana. Bidet et Boux. 



Area cymodoce, H. Coquand (young). 



Area, sp. 



Cardium subhillanum, Leym. 



impressum, Besh. 



Astarte, sp. 



Isocardia nasuta, H. Coquand, 



, sp. 



Leda scaphoides, Pictet et Campiche. 



Tellina ? gibba, H. Coquand. 



Corbula striatula, Sow. 



Pholadomya semicostata, Ag. 



Pholadidea (borings). 



Serpula. 



Numerous small univalves and bivalves, 



fragmentary and undeterminable. 

 Much wood and carbonaceous matter. 



* Mr. Ethei-idge is engaged in the preparation of descriptions of those 

 fossils of the Punfield formation which are new to this country. 

 t Since the reading of this paper, Mr. C. J. A. Meyer, F.G.S., informs me 



