136 PROCEEDINGS COTTESWOLD CLUB 1910 



the Oolite Marl is recognizable as a distinct deposit up this 

 valley, and is not with difficulty separable from the Upper 

 Freestone, as is the case at Rodborough Hill and the Frith, 

 near Painswick. Upon the Upper Freestone, which at both 

 localities is about 9 or 10 feet thick, reposes the Upper 

 Trigonia-Grit. Hull, in the Geological Survey Memoir on the 

 " Geology of Parts of Wiltshire and Gloucestershire," grouped 

 together all the ragstone-beds between the Clypeus-Gvit and 

 the Upper Freestone, and called them " Lower Ragstone,'" 

 applying the term "Upper Ragstone" to the Clypeus-Grit. 

 Therefore, it will be understood that in his record of the 

 Wall's-Quarry section, the term "Lower Ragstone" there 

 means Upper Trigonia-Grit, for there are no Intervening-Beds 

 present. The Upper Trigonia-Grit, from Wall's Quarry east- 

 wards to the Sapperton Tunnel, maintains a thickness of 

 between 8 and 10 feet. The precise thickness of the Clypcus- 

 Grit has not been ascertained, but probably it measures some- 

 where about 15 to 20 feet. 



The Fullers' Earth is seen in many small openings, and on 

 the steep valley-side at Cowcomb is very tolerably exposed. It 

 contains, throughout its course along this side of the valley, 

 bands of impure limestone absolutely crowded with specimens 

 of Ostrea acuminata. 



I Loc. cil., p. lO. 



