Wol.'53. | JURASSIC OF THE SOUTH WALES DIRECT LINE. TAY 
Average diameter = 25 to 50 millimetres ; height=12 to 14mm. 
The brachiopods have been examined by Mr. J. W. D. Marshall, 
who has kindly compared them with specimens from his large 
collection of Jurassic brachiopods. The specimen of Verebratula 
from the Montlivaltia-bed has also been submitted to Mr. Buckman, 
who acknowledges its perovalis-like aspect, but points out that it is 
contrary to all experience that this species should occur with 
Rhynchonella hamponensis. 
Rhynchonella subringens.—Only two specimens of this shell were 
found ; they also were submitted to Mr. Buckman, who regards them 
as indisputable evidence of the Pea-Grit horizon. He points out 
that the presence of that horizon at Sodbury indicates a slight 
syncline, which he had already surmised on other evidence. 
(f) Fullers’ Earth and Passage-Beds. 
Rocks belonging to the Fullers’-Earth Series were met with in all 
the shafts east of the Cross Hands, and the lower beds are exposed 
at the surface in a small cutting close to the first permanent shaft 
(No. 5). Our knowledge of the vertical succession is derived, 
partly from this cutting, but, in the main, from the set of specimens 
obtained from the shafts and preserved in the Great Western Railway- 
office at the Cross Hands. 
The following section is constructed from an examination of the 
rock-specimens derived from Shaft No. 4, which is the only shaft 
that penetrates the whole series of beds intermediate between the 
oolitic limestones of the Great Oolite above, and those of the 
Inferior Oolite below. 
Thickness in feet. 
Great OoLiTE. Coarse-grained oolitic limestone. 
? ges _ jy Compact sandy limestone, with thin 
(?) Passacu-Bups. 1 ange nee soc duadnehdeerg ae eee eerie 36 
( Clay and shale, full of Ostrea acu- 
MUUCH a es cats cas waht Gaia eee ne 28 
Argillaceous limestone ......... about 10 
Fuuters Hartu. < Clay, with Ostrea acuminata ............ 27 
Compact blue limestone, with TZere- 
| bratula globata and Ostrea acuminata 5 
PESW ale: catccowei ces eveaaoannoneatee ere monceae 24 
Inrrrior OoLireE. Oolitic limestone (Globata-Beds). 
The uppermost beds in this section (coarse-grained oolitic lime- 
stone) may be unhesitatingly assigned to the Great Oolite Series. 
The lowermost (Globata-Beds) are those already described as 
the top beds of the Inferior Oolite. On paleontological grounds 
alone, these basal limestones should probably be grouped rather with 
the Fullers’ Earth, than with the Inferior Oolite; for Terebratula 
globata, which characterizes them, occurs of identical form in the 
clays above, where it is associated with Ostrea acuminata. Again, 
the corals which occur in these limestones are of Bathonian, rather 
dE Z 
