68 PROCEEDINGS COTTESWOLD CLUB 1910 



Until the appearance of the former work the subdivision 

 now known as the Clypeus-Grit had not attracted any particu- 

 lar attention ; but then Hull remarked that " towards the 

 south-eastern part of the district, the Ragstone gives place to 

 a coarse, rubbly, white oolite, which always occurs at the top 

 of the formation immediately below the Fullers' Earth. This 

 bed, which may be called the Clypeus-Grit, is characterised by 

 many of the fossils of the Ragstone." 



Lycett, in his " Cotteswold Hills," dealt in some detail 

 with the Inferior-Oolite Series as a whole, introducing the 

 classic — if now seldom-used terms "Cynocephala-," "Fimbria-," 

 and " S^mosfl-Stages."' The first term covered the " Sands " 

 and Cephalopod-Bed : the second, the beds between the 

 Cephalopod-Bed and Ragstones ; and the third, the Ragstones. 

 Lycett, like Hull, had noticed that " the beds of the ' Spinosa- 

 Stage ' higher than the Upper Trigonia-Gvit," were worthy of 

 separate designation, and suggested the appellation " Pholado- 

 mya-Gr'it " for them ; but as Hull's term " Clypeus-Grit " has 

 priority by a few months, it is the one that should be used. 

 Lycett's correlation of his three stages with the deposits 

 at Dundry Hill, near Bristol, was unsuccessful, and his com- 

 parison of the beds, which are now known to be Buckmani- and 

 Lower Trigonia-Grits, at Rodborough Hill, was equally un- 

 fortunate. 



In 1858, in the joint memoir by A. C. Ramsay, W. T. 

 Aveline, and Prof. E. Hull on the " Geology of Parts of Wilt- 

 shire and Gloucestershire," the Clypeus-Grit of Rodborough 

 Hill is spoken of as the " Upper Ragstone," and the subjacent 

 beds of the " S^z'wosa-Stage " there as the " Lower Ragstone "; 

 while a thickness of 25 feet is assigned to the latter.^ At 

 Wall's Quarry, north of Minchinhampton, however, the thick- 

 ness of the "Lower Ragstone" is given as only 9 feet, but 

 " this fact " is stated to be " in harmony with the observed 

 alternation of the Inferior Oolite, both towards the east and 

 south from Leckhampton Hill, the typical section of the 

 formation." 



The year 1858 saw the completion of Dr A. Oppel's " Die 

 Juraformation Englands, Frankreichs, und des Sudwestlichen 



I " Cotteswold Hills," p. 72. 2 Loc. cit., p. 10. 



