10 
THE GEOLOGIST. 
question as to its age can hardly remain doubtful, all the authorities 
agreeing that the fossiliferous ironstone concretions of Furze Hill 
are unquestionably Lower Greensand. Even, however, were this not 
the case, I should have no hesitation in comparing the E,ed-gravel of 
the Badbury Hill section with the Lower Greensand " Pebble-beds" 
of the St. Katiierine's Hill quarry, near Guildford, so very striking 
is the resemblance between the two deposits. 
And it is no new idea thus to compare the Farringdon deposits to 
the sands and gravels of Devizes, Calne, etc., nor even to the pebble- 
beds of the L. G. S. of Surrey. In June, 1850, Mr. W. Cunnington 
called attention to the occurrence of most of the Farringdon Brachio- 
poda in the Lower Greensand of Seend, near Devizes (Quar. Jour. 
Geol. Soc. vol. vi. p. 453). Mr. Godwin-Austen repeatedly refers to 
these deposits as being of similar age (Quar. Jour. Geol. Soc. vol. vi. 
p. 455 ; and vol. xii. p. 69) ; and Mr. Sharpe himself admits the fact 
of their accordance to each other. In comparing these deposits, 
however, it is necessary to distinguish between the two gravel-beds 
of Farringdon, and this does not appear to have been hitherto done ; 
for it is the Eed-gravel, containing, as it does, nearly all the Bra- 
chiopoda which occur in the lower deposit, but very few of the 
Sponges, that has been met with at Seend, and not the Sponge-gravel ; 
and it is the Eed-gravel which accords best with the Lower Green- 
sand "pebble-beds" of Surrey. 
LIST OF BRACHIOPODA PROM FARRINGDON. 
o 
2 ti 
's 
• d 
U t-l I 
0) O !J0 
§.a 
41 M 
p<_ a 
rave 
Pit. 
rave 
ury 
^1 
<u a 
m O 
^4 
WO 
IB- sa 
1^ 
XI o 
o » 
O 
I 
2 
3 
4 
5 
6 
7 
Lingula truncata, So20. . . 
Thecidinm "VVethorellii, Morris 
X 
XXX 
X 
X 
Terebratella Menardi, Lam. . 
XXX 
X 
X X 
X 
X 
X 
T. oblonga, Soiv 
X 
X X 
X X 
XXX 
X ? 
Terebratula biplicata, Brocchii 
X ? 
x"? 
XXX 
T. sella, Soio 
X ? 
X X 
X ? 
T. toruacensis,t?«r., D'Archiac 
XXX 
X 
X X 
X 
x' ? 
X 
T. depressa, Lam 
X X 
X 
X 
X ? 
X 
T. Robertoni, D'Archiac . . 
X 
X ? 
X ? 
X "? 
XXX? 
X ? 
T. tamariudus, Sow. . . . 
X 
X 
X 
Rliyiichonella lutissima, Sow. . 
X X 
X 
X 
? 
X X 
XXX 
X 
X X 
X 
X 
x? 
X ? 
R. nuciformis, Sow. . . . 
X X 
X^ X X 
X X 
X 
X 
? 
X 
R. Gibbsiana, Sow 
X 
X 
X X 
N.B. X Denotes the occurrence of a species as rare. 
X X As tolerably common. 
X X X As abundant. 
Although I have formed my conclusions as to the age of the Sponge- 
