248 PROCEEDINGS OF THE GEOLOGICAL society. [Feb. 23, 
Now commencing from the south (7. e. from the short tunnel) we 
find the following strata :— 
a. Thin layers of calcareous stone, sometimes ferruginous, with 
A intermediate layers of clay, bluish from vegetable matter. 
") 6. Fibrous carbonate of lime. 
e. Hard marl. 
(d. Clay and lignite. 
e. Little sand with vegetable soot. 
jf. Hard and soft marl. 
g. Lead-coloured loam. 
h. Sands, ferruginous and yellow. 
?. Loam, red, bluish and purplish, with large bands of vege- 
table matter and lignite. 
k. Sands, ferrugimous and coloured, with intermediate bands of 
red and purplish loam. 
White sand. 
C. Stiff blue clay. 
The section will not only show the order of the strata, but the cir- 
cumstance of the gradual increase of their dip (as we proceed north- 
ward) until they become nearly vertical. On the south side of the 
tunnel (m), and before reaching the cutting, the dip was to the north 
at about the angle of 30°. At the south end of the cutting the dip 
was about 45°; towards the middle of the cutting about 60°, and 
at the northern extremity between about 70° and 80°. 
Group A. is clearly the upper part of the Purbeck formation. 
We have on the south side of the tunnel (m) unquestionable Pur- 
beck beds, and we can distinctly trace their continuity from the south 
to the north of (m). We find also the repetition of the same litho- 
logical details and the same fibrous carbonate of lime so prevalent 
throughout the Purbeck range, and which appears so much to mark 
its character in Purbeck Isle*. 
In B. group, and not very far from the tunnel (m), were found re- 
mains of bones, stated by those who saw them to have belonged to the 
SN 
Iguanodon. Its characteristic nasal horn was also secured. The po- — 
sition of this fossil reptile was about the upper limits of the Purbeck 
and the lower parts of the Hastings sands. The coloured marls con- 
tamed carbonized grasses and large bands of carbonaceous matter, 
with pieces of trees converted, in some cases, into pulverulent car- 
bonized wood, and in others to complete lignite. I found also what 
appeared to be a broad compressed Calamite, but did not meet with 
any other fossils. 
This B. group I believe to be the Hastings sand; and this inference 
will I think appear correct when we consider the features of the strata 
in connection with what I shall now subjoin. 
Dr. Buckland, in his Bridgewater Treatise, states that “‘ the Igua- 
nodon has hitherto been found only, with one exception, in the 
Wealden formation of the south of England, intermediate between the 
* Geol. Trans. vol. iv. p. 11. 
