104 
nomenclature of Cretaceous and Oolite, as divided by Professor 
Forbes, could not now be sustained. And the author proposed 
the following physical groups as more true and convenient for 
English geology. 
Mr Seeley’s divisions. Old names. 
Chalk ae 
Cretaceous series. Upper Greensand 
Galt 
Cretaceous. 
{ North Down-Sand or 
| Lower Greensand 
| Wealden) (Potton sands and 
Misra | 
Portland 
Psammolithic series. 
Upper Oolite. 3 
| 
| 
| 
J 
Wicken beds 
Pelolithic series. Coral Rag and Ampthill Clay Middle Oolite 
Oxford Clay } 
Great Oolite, &. \ 
Oolitic series. Lower Oolite. 
Inferior Oolite, &c. 
Lias 
Trias 
te 
| Kimeridge Clay 
In a large number of cases, the fossils, vertebrate and inver- 
brate, both those with the shells preserved and the casts, had 
marked affinity with fossils from lower beds. The author en- 
deavoured to account for this by the conditions of physical 
geography accumulating in one area portions of the fauna from 
several successive periods, though admitting that some species 
were probably derived from the denudation of adjacent inferior 
strata. 
Professor Sedgwick made some remarks upon the position 
and relation of the English greensands, and expiated upon the 
richness of the deposits of this era near Cambridge and the 
importance of the Upware fossils. 
