1848.] 
marine oolitic deposits of 
Portland and those of the 
greensand formation in the 
eretaceous series.” And in 
this excepted case it was 
found higher up and not 
below the Purbeck beds. 
The authors of the paper 
already referred to consider 
the existence of the Iguano- 
don as one satisfactory proof 
of the identity of the Weald- 
en formation (p. 11). 
Dr. Fitton (in Annals of 
Philosophy for 1824) de- 
scribes the Hastings sand 
formation ‘‘as consisting of 
an alternating series of beds 
of sand, more or less abun- 
dant in ferruginous matter 
...... with beds of clay 
much mixed with sand of a 
greenish or reddish hue or 
of a mottled or variegated 
appearance. Subordinate 
beds containing ..... wood, 
more or less changed, wood, 
coal, &e.” 
In the same paper we find 
that Dr. Fitton traced the 
Wealden formation to a little 
west of Lulworth, which, 
though somewhat distant, is 
yet geologically closely con- 
nected with the district now 
under examination. At that 
spot also Dr. Fitton found 
the strata placed under pre- 
cisely the same circumstances 
as at Ridgway—nearly ver- 
tical. 
I am aware, from the ap- 
parent thinning-out of the 
Wealden formation as it pro- 
ceeds westward, that infer- 
ences have been drawn as to 
its termination east of Ridg- 
way, but I do not think the 
facts stated necessarily lead 
to such a conclusion. The 
General Section of Ridgway Hill and the adjoining Strata. 
Pic, a, 
The Ridgway Cutting runs nearly due N. and S. 
North. 
The range of the strata is W. by N. and E. by S. 
Ridgway-road 
continued. 
The Cutting. 
Foot of 
Ridgway-hill. 
Upway. 
South. 
WESTON ON THE GEOLOGY OF RIDGWAY. 
See 
4. Hastings sands. 
9. Tertiary. 
8. Chalk. 
7. Chalk-marl. 
,» from which only Oxford clay was obtained. Depth 
6. Greensand. 
5. Oxford clay, 
2. Portland oolite. 3. Purbeck. 
1. Portland sand. 
aa Raised embankment over the U 
4 4 Continuation of railroad throu 
249 
about 50 feet. 
f Shaft vertical, from which only chalk and chalk-marl were obtained. Depth 56 feet. 
g Vertical shaft on top of Ridgway Hill, sunk through tertiary to chalk. 
e Shaft vertical and horizontal 
dged Portland and Purbeck beds. 
way up the hill. 
dd The cutting referred to in pages 247 and 248. 
pway Valley. 
gh acknowle 
mm Short tunnel under the road half- 
