Vol. 58. ] JURASSIC OF THE SOUTH WALES DIRECT LINE. 751 
Thickness in feet. 
(4. Clay, with hard bands not markedly pisolitic, the 
hard bands predominating at the top ......... seen 20 
Coratiran. ¢ 3. Hard pisolite, with a thin irregular band of black 
| clay sometimes: pisOlitie 2.02). 08 1212 stee-aieeyodseccn- + 
G2.» Pisolitierelayese ese. coe heen vaaeeemegl ages e sa eenmracein if 
e 
1. Stiff dark-blue Oxrorp Cray with Thracia, becoming 
MOLeSatid'y ADOVE” - saeseasconcuts ot spe tes tesserae 93 
Cidaris florigemma and Ostrea sp. were common in all the beds 
above the Oxtord Clay. Thecosmilia annularis, Cheminitzia, and 
Belemnites abbreviatus (Mil.) also occurred in the Coraliian. 
The beds near the bridge on both sides of the line have only a 
slight south-easterly dip, but a few yards tothe east the dipis as much 
as 15°, the direction being south 15° east. There was not enough 
evidence to enable us to determine whether this was due to flexure, 
or to a fault which is shown here in the 1-inch Geological Survey 
map, but of whose presence we obtained no other evidence. 
VII. Summary anp Concuusions. 
The following seem to us to be the most noteworthy points about 
the section that we have examined :— 
(1) The thickness of the Lower Lias (about 200 feet tothe top of 
the Capricornus-Zone) as compared with that in the districts 
farther south ; and its remarkably shaly character, limestone 
being predominant only at the base. 
(ii) The presence ef the three zones of the Upper Lias in a thick- 
ness of about 10 feet, and the pyritous condition of the 
_ fossils in the Bifrons-Zone. 
(iii) The great thickness of the Cotteswold Sands (185 feet), 
and the occurrence at several horizons of hard sandy beds 
containing Ammonites striatulus, as previously noted by 
Mr. 8. 8. Buckman. 
(iv) The occurrence of four ammonite-zones (fide Mr, Buckman) 
in an exceptionally fossiliferous Cephalopod-Bed. 
(v) The recognition of the Pea-Grit horizon in the Sodbury 
district. 
(vi) The presence of an oolitic limestone of considerable thickness, 
containing fossils of Fullers’-EKarth type, and forming a 
passage-bed between the Inferior Oolite and the Fullers’ 
Earth.* 
(vii) The occurrence of a thick series of sandy limestones at the 
top of the Fullers’-Earth Series, probably on the same horizon 
as the Stonesfield Slate. 
(viii) The character of the upper beds of the Great Oolite, which 
consist of wedge-bedded oolitic limestones containing a series 
1 Somewhat similar passage-beds are described in Mem. Geol. Surv. ‘ Jurass. 
Rocks’ vol. iv (1894) pp. 129 & 232. 
