HEADOM BEDS. 



143 



Upper Headon 

 Beds, 58 feet. 



Middle Headon 

 Beds, 12G feet. 



Lower Headon 

 Beds, 28i feet. 



Headon Beds in J^hitecliff Bay, 



Grey, reddish, bluish and ash-ooloured Ft. In. 

 laminated clays. Layers of Potamomya 

 greyaria, with occasional Paludina lenta, 

 Melania 2 sp., Fish-scales, Serpula on the 

 Paludina and Potamomya - - - 



Grey laminated clays. Unio, Cyrena ohovata 



Sandy clay with calcareous concretions. 

 Limncea caudata, Chara IVrightii - 



Ferruginous sands and calcareous hard bands. 

 Hydrobia, &c. - 



Green clay, with Cyrena obovata - -\ 



Brown clay, without fossils - - - J 



Yellow sand, without fossils - 



Marl and green clay with calcareous concre- 

 tions. Cyrena obovata, Limncea longiscata, 

 Planorbis euomphalus, pieces of wood 



White sand \vith thin layers of whitish clay - 



Alternations of carbonaceous clays and 



greenish sands Cyrena obovata, Potamides, 



{^ Chara Wrightii . . . . 



'Green sandy loam, with a few casts of marine 



shells. Psammobia compressa, Cytherea 



incrassata, Cyrena - - - . 



Blue sandy clay. Cytherea incrassata very 

 abundant at the top ; Ctrithium pseudo- 

 cinctum - . . - . 



Stiff blue clay, full of fossils. Cytherea in- 

 crassata, Psammobia compressa, Cyrena 

 obovata, Fusus labiatus, Cancellarin elongata, 

 C. muricata, Natica labellata 



Sand or sandy greenish clay weathering 



brown. Ironstone nodules. Casts of 



<{ marine shells - . . . 



Brown sandy clay, often with nodules con- 

 taining marine shells and fish-remains. 

 Cardita deltoidea, &c. - 



Brown clay, containing pieces of the under- 

 lying clay and flint-pebbles, and full of 

 marine shells. Ostrea, Modiola, Cardium, 

 Cardita deltoidea, Cytherea incrassata, 

 Calyptrcea, sp. Fusus, Voluta spinosa, V. 

 geminata, &c. (Messrs. Keeping and 

 Tawney record 62 species of mollusca from 

 this bed and compare it with the Brocken- 

 hurst zone of the New Forest) - - 2 



Green freshwater marls, with seams of Pota- 

 momya plana, Planorbis, Limncea, &c. 



Grey sandy clay - . - . 



Hard ferruginous sandstone - - . 



Pale-green clays, with seams of lignite, and 

 ironstone nodules. Paludina lenta, Limncea. 

 I Planorbis euomphalus, P. obtusus, &c. 

 I Carbonaceous clay and lignite 

 I Green clay, ferruginous at the base. No 

 1^ fossils observed - - - - 4 



<; 



Total 



212 3 



Here, as at Cowes, there seems to be a tendency in the marine 

 bands to thicken at the expense of the estuarine Lower Headon 

 Bed?. These marine bands become more thoroughly marine, losing 



