152 L. Dudley Stamp— 
Paris Basin. Hampshire. 
OLIGOCENE y : . | Marls above the | Bembridge and 
Gypsum. Hamstead Beds. 
Ludian  . . | Limestone and marls | Upper Headon Beds 
Hoe [ of the gypsum with os) enn! 
Been Phol. ludensis. Middle Headon Beds. 
[Partonion Limestone of Noisy- | Lower Headon Beds. 
(sensu stricto) le-Sec, etc. 
Sands of Marines | Barton Sands. 
and Cresne. Barton Clay. 
It seems unwarrantable to use the much misused term Bartonian 
to include also all the Headon Beds as Leriche * has done. Those 
who insist on grouping all these beds together with the Barton Clay 
and Sands as Eocene, would do better to employ the term Marinesian ~ 
of Dollfus.? 
In any case our Lower Headon Beds ‘must be linked with the 
Barton Sands as Hocene, and part of the Bartonian cycle. Also the 
Middle Headon Beds must be regarded as the commencement of 
a separate cycle. 
B. THe Hampsuire “ Basin ”’. 
The Hampshire Basin is particularly suited to the study of cycles 
of deposition. There are at least four continuous sections of 
practically the whole of the Hocene sequence in the sea-clifis— one 
from Studland Bay round Bournemouth Bay to Highcliffe and 
Barton (Long Mead End), a second in Alum Bay at the western end 
of the Isle of Wight, a third in Whitecliff Bay at the eastern end of 
the Isle, and a fourth in Bracklesham Bay and the coast of Chichester 
Harbour to the north. Some of the lower beds are also seen further 
west, in Dorset, and further east in the outliers near Newhaven, 
Sussex. These sections lie approximately along a west and east 
line, from a predominantly continental sequence in the west to an 
almost completely marine onein the east. The outliers at Newhaven 
also are closely linked stratigraphically with those near Dieppe, on 
the other side of the English Channel. 
The accompanying diagram (Fig. 3, p. 153) shows how naturally 
the Eocene deposits of the Hampshire Basin group themselves into 
cycles. The variations in thickness of the various beds conform 
to the theoretical requirements to a remarkable degree, especially 
when one remembers there is considerable distortion due to folding. 
Landenian.—The Landenian is represented in the Hampshire 
Basin by a series of mottled clays and coarse, false-bedded sands _ 
of fluviatile origin (Reading Beds). In the west (Dorset and Devon *) 
1 Leriche, op. cit., 1905, p. 391. 
2 Dollfus, op. cit., 1909, p. 107. 
3 Reid, Quart. Journ. Geol. Soc., vol. lii, 1896, p. 490; ibid., vol. liv, 1898, 
p. 234, 
