Vol. 58. ] JURASSIC OF THE SOUTH WALES DIRECT LINE. 747 
V. Tuer Forest MarBipe AND THE CoRNBRASH. 
The Forest Marble crops out south-west of Badminton, a few 
yards west of the eastern end of the big tunnel, and extends thence 
eastward as far as Bradfield Farm, south-east of the village of 
Norton, a distance of 63 miles. As regards the extent of country 
that it occupies, and the number and size of the cuttings opened in 
Fig. 5.—Cutting about 650 yards cast of Sodbury Tunnel. 
| Forest 
Marble. 
Clay, with hard 
band. Bradford- 
Clay facies pre- 
dominating over 
Great - Oolite 
facies. 
Wedge-bedded 
Upper 
Great 
Oolite. 
VL ——_—~,-- ao) W.-Y LV —______ 
it, the Forest Marble is undoubtedly the most important deposit cut 
through by. the line. 
The Forest Marble maintains throughout its typical character, as 
beds of variable shale alternating with compact shelly, oolitic, lime- 
stone, or hard sandy limestone with doggers. It shows great 
lateral variability, the limestone-bands being all lenticular deposits, 
not traceable for any great distance. The shelly limestones jut out 
like ledges in the shales, and have their surfaces covered with fossils, 
among which species of Pecten are common. When broken across, 
the limestone-slabs are seen to be made up of parallel layers of 
closely packed shells. On the surfaces of such slabs we recognized 
