HAMSTEAD BEDS. 



187 



Lower 



Hamstead 



Beds 



(lacustrine 



and estuarine) 



224i feet. 



I White Band — Green clays and white shell- 



rearls. Melaniafasciata,Gerithiuininornatum. 



} G. Sedywickii, Mya minor, &c. 



Green clay, with lines oi ironstone nodules at 



the base . - . . . 



Obscure - . . . . 



Black or slate-colom-ed carbonaceous clay, full 



of Gyrena semistriata and Nematura pupa. 



Also Bythinia conica, Gerithium 2 sp., and 



Cyclas Bristovii - - . . 



Green clay . . . - . 



Black laminated clay, full of Planorbis obtusus, 



P. sp., and Gyclas Bristovii • - - 



Green clays - - . . - 



Mixed black and green clay, full of Melania 



mnricata, Hydrobia Ghasteli, Limnaiu, Plan- 



I orbis, &c. - - - . . 



I Green clays with Paludina, Nematura, sp. (in 



Ithe upper part), Melanopsis carinata 

 Black Band, full of Paludina lentaj Unio at 

 [_ the base ..... 



Feet. 



7 

 28 



20 

 U 



Total 



- 255^ 



The constant landslips from Hamstead clifF render it impossible 

 to measure the whole of the beds at any one time. It will there- 

 fore be necessary, as far as possible, to fill up the gaps in the above 

 section from notes taken during the original survey of the Island. 

 Unfortunately the 60 feet of beds above the White Band do not 

 appear ever to have been measured in detail, and the 

 section only gives the lower part : — 



followinof 



Section of the loiver part of the middle freshivater and estuary 

 marls and of the white hand, measured in a low cliff on the 

 shore, at the base of a great founder. {By Professors Ramsay 

 and Morris^ 



Rubble. 



Small bands of clay, with apparently nodules of ironstone 



Band of crushed Oyrewffl 1 inch - - - - ."^ 



Shaley clay 1 inch - - - - - i 



Band of crushed Gyrena and Melania fasciata in great abundance, [ 



1 inch ---..-.-J 

 Brown clay -.---.. 



Ferruginous band: Melania fasciata, Gyrena, Paludina separated 



by a very thin layer (sometimes passing into it) from another 



similar layer .._..-. 

 Ferruginous band, containing the same shells ; with Gerithium - 

 Laminated clay, with bands of compressed Melania and Gyrena about 

 Greenish tenacious clay, with bands of Paludina and Fish remains 

 Ferruginous concretions, covering a layer of compressed Gyrena - 

 Tenacious green clay ; a layer of Melania (and bones of turtle) 



1 inch from the bottom, with concretions of clay-ironstone 

 Thin layer of vegetable matter, with reed-like plants and long 



seeds (Folliculites), patches of Paludina 

 Greenish sandy clay forming the shore, with large concretions ; 



patches of shells, Paludina . . - - . 



'Verdigris-green clay, with two bands of Gyrena semistriata , 

 more or less perfect ; in the lower half of the bed (between 

 which is a thin layer of ironstone with. Panop(Ba Gibbsii ?) 

 Gerithium, Melania, Fish, and Folliculites in the lowest 

 band of Gyrena ..... 



Ft, In, 



4 



3 



1^ 





3 



01 

 3 



1 



