80 PROCEEDINGS COTTESWOLD CLUB 1907 
The Upper Coral-Bed thus affords a very useful datum- 
level for the purpose of correlating the beds immediately 
above and below it. 
At Dundry Hill, near Bristol, and at Timsbury Sleight, 
between the Upper 77zgonza-Grit and the Upper Coral- 
Bed are freestone-beds : at Dundry Hill measuring at least 
20 feet. There is no doubt about the intervening position 
occupied by this freestone at Timsbury Sleight, because 
the complete sequence from the Upper-Lias clay to the 
Upper Coral-Bed was seen in a continuous section in 
a trial-shaft. At Dundry Hill the supra-Upper-77zgonza- 
Grit position of the freestone was proved as long ago as 
1859 by Sir William V. Guise,* who obtained the neces- 
sary evidence from masses of Upper 77zgouza-Grit dug out 
of a well that had been sunk through the floor of the 
quarry. He, however, paralleled the Dundry Freestone 
with the limestones above the Upper 77zgouza-Grit in 
Limpley-Stoke area, thereby erring, for the rock there 
is of later date than the Upper Coral-Bed—not earlier. 
At the Mount-Vernon Quarry there is no deposit 
between the Upper Coral-Bed and Upper 77zgonza-Grit— 
any equivalent to the Dundry Freestone is absent. Whether 
any representative was deposited and subsequently re- 
moved, or there was no deposit made, cannot be said. 
The non-sequence is indicated by a layer of oysters on top 
of the Upper 77zgonza-Grit, signs of erosion, and borings. 
Similar phenomena may be studied at several places in the 
Cheltenham district, especially on Shurdington Hill, near 
the iron gate at the top of the private road leading to The 
Crippetts Farm. 
1 Proc. Cotteswold Nat. F. C., Vol. ii (1854-60): pp. 170-175. 
