42 PROCEEDINGS COTTESWOLD CLUB 1904 
Generally speaking, the component deposits of the 
lower stage are fairly persistent, but there is evidence 
to show that at the horizon at which they are not so 
constant is at the top of this stage—beds 5a, 5 b, 6 and 7. 
In tracing the Bone-bed into Worcestershire, it has 
been shown that the massive sandstone-bed at Bourne 
Bank is its equivalent. This bed, near Croome D’Abitot, 
rests upon 2 feet 11 inches of shale, and the latter deposit 
upon the “Tea-green Marls.” At Dunhampstead, how- 
ever, between the Bone-bed-equivalent and the “ Tea-green 
Marls” is a deposit 4 feet I inch thick, while the maximum 
thickness of the Bone-bed-equivalent is 2 feet 6 inches. 
The point, however, to notice, is the presence of a sand- 
stone-bed resting upon the Keuper Marls—bed 17. From 
a study of the sections, it is obvious that the maximum 
thickness of the Lower Rheetic Stage, and most probably 
of the upper also, obtains here. But from Dunhampstead 
to Wainlode Cliff, the Bone-bed and the subjacent Rhetic 
deposit becomes thinner, and the same phenomenon is 
observable if the beds be traced eastwards, for at Marl 
Cliff the Bone-bed is but one inch thick, and is separated 
from the “ Tea-green Marls” by two feet of shale. 
The only section of the Upper Rhetic at Woodnorton 
shows that the lithic structure of the component beds 
is fairly persistent, but that—as compared with Wainlode 
Cliff—their total thickness has increased. The /stherza- 
bed, as in North-west Gloucestershire, affords a sure 
datum-line for correlation purposes. 
V.—Note on the Generalized Section. 
In order to facilitate the correlation of the beds visible 
in the sections in Worcestershire with those in North-west 
Gloucestershire and at Sedbury Cliff, near Chepstow,’ the 
r Quart. Journ. Geol. Soc., Vol. lix. (1903), p. 390. 
a a 
