Se sas. 
250 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. |Feb. 23, 
substance of Dr. Fitton’s Note on Vertical Strata, when connected 
with an examination of the sections referred to im the text, leaves 
the mind quite open for the discovery of a further extension to the 
west of the same strata. On the whole therefore I must conclude 
that the formation in group B. is that of the Hastings sand. 
The Weald clay does not appear to be represented in this locality, 
but its absence may have resulted either from the pressure and con- 
fusion naturally connected with such verticality of strata, or from 
other causes easily to be conjectured. The Mewp Bay section has 
no Weald clay, and presents in its ferruginous sands details singularly 
analogous to those of Ridgway Hill*. 
The next stratum (C.) consists of stiff blue clay. In this I found 
that a shaft was sunk to some depth from the surface-lme of the 
country, and then carried many feet at right angles northward to 
reach another vertical shaft previously sunk in the chalk. I waited 
with some anxiety to hear the results which the horizontal shaft 
might disclose on reaching the chalk, and I have since learned from 
the engineer of the works that ‘the clay met the chalk (or rather 
chalk-marl) in absolute contact without the interposition of any sand 
and in a direction nearly perpendicular.” 
The relative position of the vertical and horizontal shaft, from 
which blue clay only was extracted, and the vertical shaft sunk m the 
chalk, from which chalk and chalk-marl only were obtained, will be 
clearly seen on reference to the section, in which the former is marked 
(e), the latter (/). 
From this argillaceous deposit I collected several fossils, some of 
which were much broken by the workmen’s tools. These I forwarded 
to Mr. J. Sowerby, who has bestowed much attention on them, and 
very kindly sent me the following communication :— 
“‘ Most of the fossils are in too imperfect a state to be named with | 
certainty, but I have done what I could with them. : 
“The following is a list :— j 
1-6. Gryphea dilatata. ! 
7. Very near to Ammonites catena. 
8. dm. Arduensis, D’Orbigny, Ter. Jurass. t. 185. 
9. Am. Marie, D’ i Ter. Jur. t..179. 
0. Am. Lamberti? 
1. Pholadomya; well-known, but I believe unnamed, with a small | 
compr essed Astarte, also unnamed, attached to the clay. j 
12. Thracia depressa. . 
13. Part of Ammonites, with an Anomia adhering. 
14. Nucula and Turritella? 
15. Trigonia clavellata. 
16. Modiola bipartita. 
17. Modiola, I thmk unnamed. 
18. Myacites musculoides (Goldfuss, v. 153. f. 10). 
19. Thracia depressa. 
20. Nucula, same as No. 14; both too a to be made out. 
* Mewp Bay is about two miles east of Lulworth. The section in my posses- 
sion was copied some years ago from one kindly lent me. by Prof. Sedgwick. 
