THE JURASSIC DEPOSITS WHICH UNDERLIE LONDON. TAT. 
limestones with bands of marl between them, exactly answering in 
fact to much of the Great Oolite in other parts of this country. 
Of truly,arenaceous strata, I have been able to find no evidence 
whatever, and there is but a slight admixture of sandy material in 
some of the marls. 
With respect to the alleged discovery of Neocomian fossils in 
cores from Meux’s Brewery I have made the most careful inquiries, 
and have been greatly aided by the officers of the Geological 
Survey, in whose custody the specimens now are. 
The rock containing the fossils in questions is a perfect oolite, and 
has nothing of a sandy character in its composition. The fossils in 
it are all in the condition of casts. There is no indication on the 
core as to the depth at which it was obtained, and any label that 
may have formerly existed has unfortunately been lost. It is stated, 
however, in the section drawn up at the time by Professor Prestwich, 
that these fossils occurred between the depths of 1035 and 1059 
ft. from the surface, that is in the lower half of the 64 ft. of rock 
hetween the Gault and the Devonian. 
The fossils which it was thought could be specifically determined 
were Cardium Hillanum, Trigona aleformis, and Trochocyathus 
Harveyana, a somewhat remarkable intermixture of Gault and Neo- 
comian forms. Of these fossils no trace of the first mentioned could . 
be found. The second, after the most careful study by the aid of 
the original specimen and casts from it, I find myself quite unable 
to identify with the Cretaceous species ; but on the contrary, though 
speaking with the greatest reserve, on account of the imperfect 
character of the specimen, I incline to the view that it represents a 
Great-Oolite form, and is near to, if not identical with, 7’. Moretonis. 
With regard to the coral, which is only the fractured surface of a 
east, I think it would be rash to hazard an opinion even as to its 
generic affinities. 
But a very interesting fact was discovered by the officers of the 
Geological Survey by breaking some fragments from the block of 
limestone containing the supposed cast of Trigonia aleformis. In 
this manner there were revealed a number of casts of Nerinewa, 
belonging to a form of undoubtedly Great Oolite affinities, and in 
all probability identical with the NV. punctata of Voltz. 
Thus the identification of Neocomian fossils in the rock from 
Meux’s Brewery completely breaks down upon reexamination, and 
as we have already seen there is abundant evidence of its Great- 
Oolite age. 
If there were any beds at Meux’s Brewery answering to the 
reconstructed strata which at Richmond have been dcubtfully 
referred to the Neocomian, they must have certainly been very thin, 
and of their existence I have not been able to obtain a particle of 
evidence. 
X. GenerRAL CHARACTERS OF THE GREAT-OOLITE STRATA UNDER LONDON. 
The Great-Oolite strata, which are 87} ft. in thickness under 
Richmond, and 64 ft. under the Tottenham Court Road, appear to 
